OPERATING INSTRUCTIONS. for the TYPE KATC-C1 AUTOMATIC TRANSFORMER COMPARATOR

Transcription

1 OPERATING INSTRUCTIONS for the TYPE KATC-C1 AUTOMATIC TRANSFORMER COMPARATOR Serial Number: Leaflet Number Revision A April 2014 Knopp Incorporated th Street Emeryville, California (510) (800) (510) (FAX)

2 Table of Contents General Information... 1 Specifications... 2 Installation... 4 Type KCTS Current Transformer Testing System... 4 Operation... 6 Description of Controls... 6 ON/OFF Switch... 6 REFERENCE TRANSFORMER Switch... 6 TRANSFORMER-UNDER-TEST Switch... 6 RATIO ERROR Switch... 6 PHASE ERROR Switch /60 Hz LEDs... 6 MEASURE Push-button... 6 HOLD/RUNDOWN Push-button... 7 PRINT Push-button... 7 Operating Procedures... 7 Connecting the Transformer-Under-Test... 7 Performing a Test... 7 One-to-One Test... 9 Display Messages... 9 Freq. Counter no Start... 9 Freq. Counter no Finish REF. COUNTER = ERROR COUNT>REF. COUNT S E*COS() > WRONG POLARITY PHASE ANGLE > (SEcos)2(Esin)2 > A/D not low (start) A/D not high A/D not low (end) REF CURRENT TOO HIGH ERROR CURRENT TOO HIGH AUTORANGING RUNUP MEASURE HOLD/RUNDOWN Table of Contents i 04/14

3 INVALID SWITCH SETTING SET CURRENT TO XMTR not empty *** (Over-range Indicators) Troubleshooting and Repair Doesn't Work The First Time Identical Or Near Zero Results Inaccurate Test Current Display Failed or Suspect Printed Circuit Card Printed Circuit Card Listing Other Features Serial (RS-232C) Communications Port Serial Port Configuration Serial Port Baud Rate Remote Commands RS-232 Data Record Formats RATIO ERROR AND MINUTES RATIO ERROR AND MILLIRADIANS RATIO CORRECTION FACTOR AND MINUTES RATIO CORRECTION FACTOR AND MILLIRADIANS REDUCED (TWO-LINE) PRINTOUT TEST CURRENT OUTPUT Warranty Table of Contents ii 04/14

4 Chapter 1 General Information The Knopp Automatic Transformer Comparator (KATC-C1) is used to measure the ratio and phase angle errors of current transformers with respect to a "standard" or "precision" transformer. This microprocessor-based instrument automatically selects the optimum measurement range, computes the results, and digitally displays several values, including: the transformer ratio and phase angle errors, the ANSI accuracy class for which the transformer qualifies, the test current in the secondary of the precision transformer, and the test current in the secondary of the Transformer-Under-Test. The KATC-C1 has protective circuitry which helps prevent damage when the Transformer-Under- Test (TUT) is improperly connected. A serial (RS-232C) input/output port is included as a standard feature. This port can be used to download KATC-C1 test data to a computer for data storage and/or analysis. The port can also be used to control various functions of the KATC-C1 from a computer. The KATC-C1 is designed to test transformers with secondaries of one or five amperes. It automatically senses, and adjusts to, operation at 50 or 60 Hz. The KATC-C1 has been designed to make testing transformers as easy and fast as possible without sacrificing accuracy or reliability. We trust that you will find it to be a useful instrument in performing this task. KATC-C1 Instructions Page 1 04/14

5 Chapter 2 Specifications Input Power: Test Frequency: Test Current Range: Ratio Error Range: Phase Error Range: 120 VAC, 50/60 Hz, less than 0.2 A 50 or 60 Hz 5% to 500% of selected range (1 or 5 amperes) 100% to 1000% (0 to 10 Ratio Correction Factor) 1000 to 1000 minutes Accuracy Class Range: 0 to 100 Accuracy: Interlock Relay: Burden on Reference Transformer: Burden on TUT ±(0.75% of reading 1 Least Significant Digit) or (±0.01% ratio error and ±0.3 minutes phase angle error) whichever is greater Capable of carrying 120/240 Volts at a maximum of 10 Amperes Less than 0.2 VA (typical) Less than 0.2 VA (typical) Resolution: RCF Phase Angle (Minutes) Accuracy Class 0.0 Accuracy Class < Accuracy Class < Accuracy Class < Accuracy Class < Accuracy Class KATC-C1 Instructions Page 2 04/14

6 RS-232 Serial Communications Port: 1200 or 9600 baud (user selectable) 8 Data Bits No Parity 2 Stop Bits Bi-directional KATC-C1 Instructions Page 3 04/14

7 Chapter 3 Installation The KATC-C1 Comparator is designed for use as a stand-alone unit, it can be purchased as part of a complete test system, or it can be retrofitted into existing equipment. This chapter describes installation of the KATC-C1 into various pieces of test equipment and its use in a stand-alone environment. Type KCTS Current Transformer Testing System Typically, the KCTS is shipped with the KATC-C1 already installed. If you are upgrading from an older-style Knopp comparator, proceed as follows: 1. Ensure that all power is removed from the KCTS! 2. Remove the four front-panel screws which secure the existing comparator to the KCTS. 3. Slide the comparator up and out of the KCTS, laying it upside down on the top of the KCTS to gain access to the rear panel connections. Remove the rear panel connections from the old comparator. Make sure that all leads are labeled so that it will be easy to place them on the new comparator. 4. Set the old comparator aside and place the KATC-C1 on top of the KCTS so that the leads can be attached. Connect the two interlock leads to the black five-way binding posts on the rear of the KATC-C1 (polarity is not important). Next, connect the automatic run-down leads to the solid-state relay mounted on the rear of the KATC-C1. Connect the power cord to the rear of the KATC-C1. 5. Some rewiring will be necessary before connecting leads to the KATC-C1 terminal strip. Refer to Schematic Diagrams Number (originally supplied with the KCTS) and (enclosed) for guidance. Proceed as follows: a) Connect the lead marked U to the U terminal on the KATC-C1. b) Remove any connections (if present) between Ground and the chassis of the KATC. c) The lead previously marked E must be separated into two leads E and E-bar (E with a bar over it). Referring to Schematic Diagram 10280, as originally built the E lead is connected to terminal S1 on the One-to-One Test Switch and to the terminal labeled 5 for connection of the secondary of the transformer-under-test. Now refer to Schematic Number and note that terminal S1 should be connected to the E terminal on the KATC-C1 Instructions Page 4 04/14

8 KATC-C1 and the 5 terminal should be connected to E-bar on the KATC-C1. Ensure that the jumper from E-bar to the red binding post (DM) remains in place. It is important that all connections are clean and tight and that wire of sufficient gauge (#6) is used. d) Connect the lead marked S to the S terminal on the KATC-C1. Double check that all connections have been made correctly and that they are all tight. The drawing below shows the transformer connections to be made to the terminal board on the rear panel of the KATC-C1 if the KATC-C1 is not used as a part of a test system. This connection allows the KATC-C1 to be used with a standard transformer and burden in a bench-top situation. The "AC Supply" shown on the drawing should be controlled by a variac so that current can be applied gradually. AC Supply Standard Transformer PRI SEC ± ± PRI SEC ± Transformer Under Test ± Burden S E E U Demag Terminal (Red) KATC-C1 Terminal Board KATC-C1 Instructions Page 5 04/14

9 Chapter 4 Operation Description of Controls ON/OFF Switch Controls 120 VAC power to the KATC-C1. REFERENCE TRANSFORMER Switch Used to configure the KATC-C1 for use with reference (precision) transformers with 1 or 5 ampere secondaries. Do not change this switch with current applied to the KATC-C1. TRANSFORMER-UNDER-TEST Switch Used to configure the KATC-C1 for testing transformers with 1 or 5 ampere secondaries. Do not change this switch with current applied to the KATC-C1. RATIO ERROR Switch Allows the ratio error of the transformer-under-test to be displayed in Percent Error (%E) or Ratio Correction Factor (RCF). [%E = 100 * (RCF-1)] PHASE ERROR Switch Allows the phase angle error of the transformer-under-test to be displayed in Minutes (MIN) or Milliradians (MR). [1 Minute = Milliradians] 50/60 Hz LEDs Indicate whether the KATC-C1 has detected the applied test current to be 50 or 60 Hz. If no test current is applied, the LEDs default to 60 Hz. MEASURE Push-button Toggles the KATC-C1 between MEASURE and RUNUP modes. MEASURE mode should be selected when the desired test current has been reached. Selecting MEASURE mode causes the KATC-C1 to begin taking measurements using the optimum measurement range. Measurements can be taken at any current greater than approximately 4% of the selected transformer-under-test secondary current. Selecting MEASURE mode erases any data previously saved by pressing the HOLD/RUNDOWN push-button. KATC-C1 Instructions Page 6 04/14

10 RUNUP mode causes the KATC-C1 to not take any measurements, instead the KATC-C1 selects its highest internal error range. This mode is used while the test current is being adjusted to minimize chances of damage to the comparator. This push-button is also used to reset the KATC-C1 after an error that caused an "alarm" condition is corrected. HOLD/RUNDOWN Push-button "Freezes" the displayed data so that the test current can be reduced to zero with the test data still available. A box ( ) is shown in the display to indicate that the displayed data is held and will not change if the test current is changed. Each press of the HOLD/RUNDOWN push-button causes the display to briefly show the transformer-under-test secondary current to which the held values apply. After a couple of seconds the display returns to a real-time display of applied test current. On systems with an automatic current rundown feature (such as the Knopp KCTS) pushing HOLD/RUNDOWN also initiates rundown of the test current. PRINT Push-button Causes the displayed test result data, along with some heading information, to be sent to the device attached to the RS-232 Serial Communications Port. Sample outputs are shown later in this manual. Operating Procedures Connecting the Transformer-Under-Test If you are using the KATC-C1 without one of the Knopp Transformer Testing Systems, connect the transformers according to the instructions for Portable Use as shown in the previous chapter. When using the KATC-C1 with a Knopp Transformer Test System, refer to the instruction manual for your system for transformer connection instructions. Performing a Test 1. When power is first applied to the KATC-C1, the display will momentarily show RESET. After this message disappears, test current is displayed and RUNUP mode is selected. Since the KATC-C1 can be used with reference transformers and transformers-under-test with either 1 or 5 ampere secondaries, there are three different displays of test current provided to aid the operator. The Reference Transformer secondary current is always shown as a percentage of the selected secondary value (1 or 5 amperes). The Transformer-Under-Test secondary current is shown as both a percentage and actual value. 2. Adjust the test current slowly to the desired value. 3. Pressing the MEASURE push-button toggles the KATC-C1 between RUNUP and MEASURE modes. RUNUP mode selects a high error current range on the KATC-C1 error measurement circuit. This provides an extra measure of safety to the equipment and allows the current to be increased more quickly than when the KATC-C1 is in the measure mode. KATC-C1 Instructions Page 7 04/14

11 In the MEASURE mode the KATC-C1 is constantly calculating and displaying accuracy measurements and thus does not react as quickly to large changes in current. While we recommend using the RUNUP mode to set the test current and then pressing MEASURE to begin taking measurements, it is possible to change the test current while in the MEASURE mode. If this is done, it is important that the current is changed slowly so as to reduce chances of damaging the comparator. As the test current is increased with the KATC-C1 in MEASURE mode, the display on the KATC-C1 will occasionally go blank. This is normal and is caused by the auto-ranging feature of the KATC-C1. Auto-ranging is what allows the KATC-C1 to provide excellent accuracy throughout the measurement range. 4. After the test data are displayed, press HOLD/RUNDOWN to "freeze" the results in the display then reduce the current to zero. a) If the KATC-C1 is installed in a KCTS, the test current is automatically reduced to zero (or near zero) upon pressing HOLD/RUNDOWN if the AUTO RUNDOWN switch (located in the KCTS) is turned on. Refer to the KCTS Instruction Manual for more information on this feature. b) The HOLD status is denoted on the KATC-C1 display by the appearance of a "box" ( ) next to the display of test current. c) Each time the HOLD/RUNDOWN button is pressed, the current at which the displayed results were taken is recalled to the display for a short time. The ammeter then returns to showing the presently applied (real-time) current. 5. Record the test data, or, if you have a computer or serial printer connected to the KATC-C1 RS-232 Serial Communications Port, the data can be sent by pressing PRINT. It is also possible to have the computer send a command to the KATC-C1 to cause it to send the test result data. See the section entitled Remote Commands for more information. 6. Press MEASURE to clear the HOLD status and erase the test data. KATC-C1 Instructions Page 8 04/14

12 One-to-One Test The One-to-One test verifies proper operation of the KATC-C1 measurement circuitry. The connections shown below are to be used if the KATC-C1 is not used with a Knopp Transformer Test System, or if the KATC-C1 has been removed from a test system for troubleshooting. If the KATC-C1 is installed in a Knopp Transformer Test System, see the instruction manual included with that unit for information on running the One-to-One test. The "AC Supply" shown on the drawing should be controlled by a variac so that current can be applied gradually. ± Standard Transformer ± SEC PRI AC Supply Burden S E E U Demag Terminal (Red) KATC-C1 Terminal Board Display Messages Following is a listing and description of all messages which the KATC-C1 may display. Some descriptions include references to Printed Circuit Cards. These cards are located in the KATC-C1 card cage. The card cage is accessed by unscrewing the two thumbscrews on the rear of the KATC-C1 and removing the fan assembly. Each card in the card cage is identified by a numbered plastic ejector. It is these ejectors which are referred to as a card number in the descriptions which follow. Some of these messages are accompanied by an alarm beep from the comparator. The alarm continues to sound until the condition which caused it is corrected and the MEASURE push-button is pressed. When the alarm sounds, the KATC-C1 opens the interlock relay and initiates a run down of test current (in test systems with this capability). Freq. Counter no Start This message indicates that the Zero Crossing Detector on Card #4 in the KATC-C1 is not able to detect the sinusoidal current as it passes through zero. This could be caused by a loss of signal to the card or by a defective component on Card #4 or by problems on other PC Cards. Contact Knopp for further diagnosis. KATC-C1 Instructions Page 9 04/14

13 Freq. Counter no Finish This message is similar to the message above except that it indicates that the KATC-C1 was able to start taking a measurement but was unable to complete the process. REF. COUNTER = 0 This message indicates that zero crossings were detected but that there have not been any counts received from the Counter Card #6. This could be caused by a defective component on Card #6 or Card #4. Contact Knopp for further diagnosis. ERROR COUNT>REF. COUNT This message indicates a defective Card #6 (Counter Card). Contact Knopp for further diagnosis. S E*COS() > This message indicates an internal math overflow during error calculations. This message could be caused by a large error in the transformer-under-test when the test current is near the maximum 25 ampere capability of the KATC-C1. Reducing the current should allow the KATC-C1 to take a measurement and indicate the large error in the transformer-under-test. WRONG POLARITY If the Transformer-Under-Test is connected with incorrect polarity, the display will indicate WRONG POLARITY. Continuing to increase the current will trigger the audible alarm and result in an opening of the KATC-C1 interlock relay. PHASE ANGLE > 45 This message indicates that the phase angle error of the transformer-under-test is greater than 45. An error of this magnitude is too large for the KATC-C1 to accurately measure. (SEcos)2(Esin)2 >625 This message indicates an internal math overflow during error calculations. This message could be caused by a large error in the transformer-under-test when the test current is near the maximum 25 ampere capability of the KATC-C1. Reducing the current should allow the KATC-C1 to take a measurement and indicate the large error in the transformer-under-test. A/D not low (start) A/D not high A/D not low (end) These three messages are related to a malfunction of the KATC-C1 Analog-to-Digital (A/D) Converter. This could be caused by a failure of the ±15 VDC Analog Power Supply or by a failure of the A/D Converter located on Card #8. REF CURRENT TOO HIGH This message indicates that the current in the secondary of the Reference Transformer has exceeded the 500% limit of the KATC-C1. KATC-C1 Instructions Page 10 04/14

14 ERROR CURRENT TOO HIGH The Error Current is defined as the difference between the secondary currents of the Reference Transformer and the Transformer-Under-Test. If the Error Current exceeds 1.5 amperes the KATC-C1 will display this message and attempt to remove test current by opening the interlock and initiating a run down of test current. AUTORANGING This message indicates that the KATC-C1 has received an internal indication of a hardware error. The comparator responds by displaying this message and attempting to restart the measurement cycle. RUNUP This message indicates that the KATC-C1 is in RUNUP mode. This mode is used when increasing the test current prior to taking measurements. The MEASURE push-button toggles between RUNUP and MEASURE modes. MEASURE This message indicates that the KATC-C1 is in MEASURE mode. This mode is used when taking measurements. The MEASURE push-button toggles between RUNUP and MEASURE modes. HOLD/RUNDOWN This message indicates that the KATC-C1 is in HOLD/RUNDOWN mode but that there is no valid data to display. INVALID SWITCH SETTING This message indicates that the REFERENCE TRANSFORMER switch is set to 1 ampere and the TRANSFORMER-UNDER-TEST switch is set to 5 amperes. This combination is not valid. One of the two switch settings must be changed in order to perform a valid test. SET CURRENT TO 0.00 This message is displayed if the REFERENCE TRANSFORMER or TRANSFORMER-UNDER- TEST switches were changed with test current applied. It is necessary to reduce test current to zero prior to changing the setting of these switches. XMTR not empty This message indicates that the Serial (RS-232) Communications Port was not able to complete sending the test result data. This could be caused by a defective cable connection to the receiving device or incorrect baud rate selection on the receiving device. *** (Over-range Indicators) If the limits of ratio error, phase error, or accuracy class (as defined under Specifications, above) are exceeded, over-range indicators (***) will appear in the appropriate places on the display. KATC-C1 Instructions Page 11 04/14

15 Chapter 5 Troubleshooting and Repair You Can Contact Knopp At: (800) or (510) Prior to initiating any repair of the KATC-C1, we encourage you to call us at one of the numbers listed above. Quite often, after hearing a brief description of the problem, we are able to identify the failed component and save you significant amounts of time. Doesn't Work The First Time If your KATC-C1 doesn't work after you have just unpacked it and applied power for the first time, the problem is probably a bad connection resulting from shipment. Remove the rear panel and "re-seat" all the printed circuit cards and the ribbon cables. Make sure that the cards "snap" into place. Also check your connections to the transformer(s) and to the loading system. Identical Or Near Zero Results If you get near identical results for a number of transformers (or near zero errors), the Error Resistor Card has probably been damaged. This can occur if a TUT has been connected with wrong polarity or you have selected the wrong current range (wrong ratio). Both conditions will cause excessive error current and, if the condition is severe enough, may defeat the protective circuitry in the KATC-C1. Remove Card 1 and inspect it for any burned resistors or traces. The relays on this card are also susceptible to excessive error current but damage may not be visually evident. Make sure that the "interlock" feature is connected to help prevent future problems. Note that the internal KATC-C1 interlock relay is capable of carrying a maximum of 120 or 240 Volts at 10 Amperes. If this relay is being used to interrupt the main supply of a current source, it may be necessary to use the KATC-C1 interlock relay to control a larger contactor type relay in order to minimize the voltage and/or current passed through the KATC-C1 interlock relay. KATC-C1 Instructions Page 12 04/14

16 Inaccurate Test Current Display If the display of the Reference Test Current seems to be inaccurate, connect an AC ammeter between the rear panel "S" terminal and the lead connected to that terminal. Then adjust R9 on Card 2 [accessed through the rear panel] inside the KATC-C1 until the display of Reference Test Current agrees with the ammeter. If the display of TUT Test Current (Amps or %) needs to be adjusted, this is an indication that the entire KATC-C1 is in need of re-calibration. Contact Knopp at the above number to schedule return of the instrument. Failed or Suspect Printed Circuit Card If it is suspected that a component on a printed circuit card has failed, we offer Next Day shipment of a replacement card. This eliminates the need to troubleshoot the failure down to a particular component on a card. While the KATC-C1 is under warranty, the card exchange is performed for no charge. After the warranty has expired there is a flat charge for the card exchange. Once the new card has been received and installed, the defective card is returned to Knopp. This method of troubleshooting allows you to minimize your time spent in diagnosing and repairing individual cards. The following section provides a reference for the various printed circuit cards. Printed Circuit Card Listing The KATC-C1 contains nine printed circuit cards. These cards are accessed through the rear door/fan assembly of the KATC-C1. A listing of the cards and their corresponding positions in the card cage follows. Card #1 Error Resistor Card #2 Standard Amplifier Card #3 Error Amplifier Card #4 Zero Crossing Card #5 Rectifier Card #6 Counter Card #7 Input/Output Card #8 Analog-to-Digital Converter Card #9 Microprocessor Card KATC-C1 Instructions Page 13 04/14

17 Chapter 6 Other Features Serial (RS-232C) Communications Port The Knopp KATC-C1 Automatic Transformer Comparator includes a standard RS-232 Serial Communications Port. This port can be used to send "Remote Commands" to the KATC-C1 from an external computer. The port can also be used to transfer test result data from the KATC-C1 to the computer. This chapter describes: how to configure the port and your computer to establish communication, remote commands which can be sent from the computer to the KATC-C1, and the data output which is sent from the KATC-C1 to your computer. Serial Port Configuration The KATC-C1 Serial Port is configured as a "Data Set." This means that the KATC-C1 should be directly connected to your computer through a standard RS-232 cable. A null modem is not required. Pins used by the KATC-C1 are: pin 2... transmitted data (TD) pin 4... request to send (RTS) pin 5... clear to send (CTS) pin 6... data set ready (DSR) pin 7... signal ground (GND) pin 8... carrier detect (CD) pin data terminal ready (DTR) Under normal operation (the KATC-C1 is not trying to send data and is assuming Data Set configuration), the TD, DSR, and CD lines (pins 2, 6, and 8, respectively) are always high (approximately 5 DC volts when compared to pin 7), and the CTS line (pin 5) is low (approximately -15 volts to pin 7). When printing is attempted, the KATC-C1 will raise the CTS line and look for high DTR and RTS before it starts transmitting data. The KATC-C1 will check both of these lines before it sends each byte of data. If the KATC-C1 does not detect BOTH of these signals high within approximately one second, the transmission attempt is aborted. At the end of a successful transmission (or an aborted attempt) the signal lines will be returned to their normal states (TD, DSR, and CD high; CTS low). KATC-C1 Instructions Page 14 04/14

18 Serial Port Baud Rate The Serial Port is set to communicate at 9600 baud. Other communication parameters are: eight (8) data bits, no parity, and two stop bits. Remote Commands For true remote operation, your computer can send commands to the KATC-C1. These commands can cause the KATC-C1 to perform various functions including: run-down of the test current, initiate a measurement, transfer of test result data to the computer, and a quick transfer of test current to the computer. The commands consist of four (4) bytes of ASCII data and are formatted as follows: <any character><z><command character><cr> where, <any character> indicates that any ASCII character may be used to start the command, <Z> indicates that the second character of the command must be a "Z" (5A hex), <command character> indicates the desired command (taken from the following list), <CR> indicates a carriage return (0/D hex) and specifies the end of the command. Following is a list of commands which can be sent to the KATC-C1 from a remote computer. Command Character H M P Description This command is the same as pressing the Hold/Rundown pushbutton. It causes the KATC-C1 to hold the test results in the display and initiate a rundown of test current (if the KATC-C1 rundown output is connected to a motorized variac as in the Type KCTS Test System). This command is the same as pressing the Measure push-button. It causes the KATC-C1 to begin taking measurements. It is usually used at the start of a test or after a Hold or Print command has been issued. This command is the same as pressing the Print push-button. It causes the KATC-C1 to send a copy of the displayed test data to the computer through the serial port. This command sends a full copy of test data including heading information, as shown in the next section. KATC-C1 Instructions Page 15 04/14

19 R T This command causes the KATC-C1 to send a reduced printout through the serial port. The reduced printout contains only test result data, no heading information is included. This is done to speed the transfer of data from the KATC-C1 to the computer. An example of this printout is also included in the next section. This command causes the KATC-C1 to send the present transformerunder-test secondary test current value to the computer through the serial port. The format of this data is shown in the next section. This function is useful if the KATC-C1 is used in an automatic test system. This output can be monitored and used to ensure that the equipment has set the test current to the proper level. RS-232 Data Record Formats There are four possible data record outputs for the KATC-C1: Ratio Error and Minutes, Ratio Error and Milliradians, Ratio Correction Factor and Minutes, and Ratio Correction Factor and Milliradians. In addition, the KATC-C1 has two other printouts (reduced printout and test current output), described in the preceding section. The format of these printouts are provided here, as well. Data files of KATC-C1 data are written in ASCII format and can be printed as ASCII files. They will appear in the same formats as the examples shown later in this document. Each record of data will be stored as one long string of bytes. Thus, to locate a particular field of data, you must know in which byte it begins. The record layouts given here show the exact byte locations for the data fields in each of the four records and the two special printouts described above. All test data records are of fixed format. Each record is 382 bytes in length. In the record layouts, the data fields are delimited by a double line ( º ). The first byte of each field is indicated by the byte position above it. Also in the record layouts: * = {CR} CARRIAGE RETURN (hexadecimal 0D) # = {LF} LINE FEED (hexadecimal 0A) X = place holder indicating possible positions for data ± = floating plus/minus indicator The following pages provide layouts for all possible KATC-C1 outputs. Each layout shows the printout which is obtained when the Print key is pressed, and an individual byte-wise description of the printouts. KATC-C1 Instructions Page 16 04/14

20 RATIO ERROR AND MINUTES ASCII format: CT TEST; REF. TRANSFORMER SEC.: X AMPS; FREQUENCY: XX HZ. REF. TUT TUT TEST TEST TEST RATIO PHASE ACCURACY CURRENT CURRENT CURRENT ERROR ERROR CLASS (%) (%) (AMPS) (%) (MINUTES) (%) XXX.X XXX.X XX.XX ±XXX.XXX ±XXX.XX XX.XX Record layout: * # C T T E S T ; R E F. T R A N S F O R M E R S E C. : X A M P S ; F R E Q U E N C Y : X X H Z R E F. T U T T U T T E S T T E S T T E S T R A T I O P H A S E A C C U R A C Y C U R R E N T C U R R E N T C U R R E N T E R R O R E R R O R C L A S S ( % ) ( % ) ( A M P S ) ( % ) ( M I N U T E S ) ( % ) X X X. X X X X. X X X. X X ± X X X. X X X ± X X X. X X X X. X X KATC-C1 Instructions Page 17 04/14

21 * # Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point for the TUT TEST CURRENT (AMPS) printout is shifted one digit to the left (X.XXX). KATC-C1 Instructions Page 18 04/14

22 RATIO ERROR AND MILLIRADIANS ASCII format: CT TEST; REF. TRANSFORMER SEC.: X AMPS; FREQUENCY: XX HZ. REF. TUT TUT TEST TEST TEST RATIO PHASE ACCURACY CURRENT CURRENT CURRENT ERROR ERROR CLASS (%) (%) (AMPS) (%) (MILLIRAD.) (%) XXX.X XXX.X XX.XX ±XXX.XXX ±XXX.XX XX.XX Record layout: * # C T T E S T ; R E F. T R A N S F O R M E R S E C. : X A M P S ; F R E Q U E N C Y : X X H Z R E F. T U T T U T T E S T T E S T T E S T R A T I O P H A S E A C C U R A C Y C U R R E N T C U R R E N T C U R R E N T E R R O R E R R O R C L A S S ( % ) ( % ) ( A M P S ) ( % ) ( M I L L I R A D. ) ( % ) X X X. X X X X. X X X. X X ± X X X. X X X ± X X X. X X X X. X X KATC-C1 Instructions Page 19 04/14

23 * # Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point for the TUT TEST CURRENT (AMPS) printout is shifted one digit to the left (X.XXX). KATC-C1 Instructions Page 20 04/14

24 RATIO CORRECTION FACTOR AND MINUTES ASCII format: CT TEST; REF. TRANSFORMER SEC.: X AMPS; FREQUENCY: XX HZ. REF. TUT TUT TEST TEST TEST RATIO PHASE ACCURACY CURRENT CURRENT CURRENT CORR. ERROR CLASS (%) (%) (AMPS) FACTOR (MINUTES) (%) XXX.X XXX.X XX.XX X.XXXXX ±XXX.XX XX.XX Record layout: * # C T T E S T ; R E F. T R A N S F O R M E R S E C. : X A M P S ; F R E Q U E N C Y : X X H Z R E F. T U T T U T T E S T T E S T T E S T R A T I O P H A S E A C C U R A C Y C U R R E N T C U R R E N T C U R R E N T C O R R. E R R O R C L A S S ( % ) ( % ) ( A M P S ) F A C T O R ( M I N U T E S ) ( % ) X X X. X X X X. X X X. X X X. X X X X X ± X X X. X X X X. X X KATC-C1 Instructions Page 21 04/14

25 * # Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point for the TUT TEST CURRENT (AMPS) printout is shifted one digit to the left (X.XXX). KATC-C1 Instructions Page 22 04/14

26 RATIO CORRECTION FACTOR AND MILLIRADIANS ASCII format: CT TEST; REF. TRANSFORMER SEC.: X AMPS; FREQUENCY: XX HZ. REF. TUT TUT TEST TEST TEST RATIO PHASE ACCURACY CURRENT CURRENT CURRENT CORR. ERROR CLASS (%) (%) (AMPS) FACTOR (MILLIRAD.) (%) XXX.X XXX.X XX.XX X.XXXXX ±XXX.XX XX.XX Record layout: * # C T T E S T ; R E F. T R A N S F O R M E R S E C. : X A M P S ; F R E Q U E N C Y : X X H Z R E F. T U T T U T T E S T T E S T T E S T R A T I O P H A S E A C C U R A C Y C U R R E N T C U R R E N T C U R R E N T C O R R. E R R O R C L A S S ( % ) ( % ) ( A M P S ) F A C T O R ( M I L L I R A D. ) ( % ) X X X. X X X X. X X X. X X X. X X X X X ± X X X. X X X X. X X KATC-C1 Instructions Page 23 04/14

27 * # Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point for the TUT TEST CURRENT (AMPS) printout is shifted one digit to the left (X.XXX). KATC-C1 Instructions Page 24 04/14

28 REDUCED (TWO-LINE) PRINTOUT This section describes the reduced printout which is available by sending the KATC-C1 the reduced printout command from a computer. This command is described in a preceding section. The purpose of the command is to minimize time required to obtain test result data from the KATC-C1. No heading information or descriptive wording is included in this printout. ASCII format: CT TEST; REF. TRANSFORMER SEC.: X AMPS; FREQUENCY: XX HZ. XXX.X XXX.X XX.XX ±XXX.XXX ±XXX.XX XX.XX Record layout: C T T E S T ; R E F. T R A N S F O R M E R S E C. : X A M P S ; F R E Q U E N C Y : X X H Z X X X. X X X X. X X X. X X ± X X X. X X X ± X X X. X X X X. X X Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point for the TUT TEST CURRENT (AMPS) printout is shifted one digit to the left (X.XXX). The entry shown for transformer-under-test ratio error will vary depending on whether Ratio Error (shown above) or Ratio Correction Factor (X.XXXXX) is selected on the KATC-C1 front panel. KATC-C1 Instructions Page 25 04/14

29 TEST CURRENT OUTPUT This section describes the test current output, which is available by sending the KATC-C1 the test current command from a computer. This command is described in a preceding section. The purpose of the command is to allow use of the KATC-C1 in an automated environment. In such an environment it may be useful to know the present value of the transformer-under-test secondary current as an aid in automatically adjusting the test current to the desired value. ASCII format: XX.XX Record layout: X X. X X Notes: When the TUT Test Current Switch is set to 1 ampere, the decimal point is shifted one digit to the left (X.XXX). KATC-C1 Instructions Page 26 04/14

30 Chapter 7 Warranty The Knopp Type KATC-C1 Automatic Transformer Comparator is warranted against defects in materials and workmanship for a period of ONE YEAR. If the KATC-C1 does not perform in accordance with stated operating specifications during the warranty period, necessary parts and assistance will be supplied under warranty to restore the equipment to service. Normal service is accomplished through telephone consultation with the Knopp Engineering Department. Parts are shipped by overnight carrier. KATC-C1 Instructions Page 27 04/14

31 I N D E X * *** (Over-range Indicators) A Accuracy... 2 Accuracy Class... 2 AUTORANGING B Baud Rate Serial Port Burden Reference Transformer... 2 TUT... 2 C commands remote Configuration Serial Port D Data Record Formats display Inaccurate Test Current Display Messages... 9 E ERROR CURRENT TOO HIGH F Features Other Frequency... 2 H HOLD/RUNDOWN I Identical Or Near Zero Results Input Power... 2 Installation... 4 interlock Interlock... 2 INVALID SWITCH SETTING K KCTS... 4 M MEASURE modes Measure... 7 Run-Up... 7 O Operation... 6 OUTPUT Test Current P Phase Error... 2 Portable Use... 5 Printed Circuit Card Listing PRINTOUT Reduced (Two Line) protective circuitry... 1 push-button Measure... 7 Push-button Hold/Rundown... 7 Measure... 6 Print... 7 R Ratio Error... 2 REF CURRENT TOO HIGH Remote Commands repair Resolution... 2 RS-232 Serial Communications Port... 3, 8 RUNUP KATC-C1 Instructions 04/14

32 I N D E X S Serial (RS-232) Communications Port XMTR not empty Serial (RS-232C) Communications Port serial (RS-232C) input/output port... 1 SET CURRENT TO Switch ON/OFF... 6 Ratio Error... 6 Reference Transformer... 6 Transformer-Under-Test... 6 T test One-to-One... 9 Test Performing... 7 test current adjust slowly... 7 Test Current... 2 Transformer-Under-Test Connecting... 7 Troubleshooting and Repair W Warranty WRONG POLARITY X XMTR not empty KATC-C1 Instructions 04/14