KATC-C1 Instructions
Page 9
04/14
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
.
PRI
SEC
S
E
E
U
Burden
KATC-C1
Terminal
Board
Demag
Terminal
(Red)
±
±
Standard
Transformer
AC
Supply
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.
