Under-Over Voltage Transformer
36 RTHC-SVD01B-EN
The ratio of the primary or line voltage to the open circuity secondary
voltage should be 20 to 1. If the unloaded turns ratio is not within 2% of
this value, replace the transformer.
Reconnect the secondary back to J3 and re-measure the loaded (con-
nected) secondary voltage. The new loaded ratio should be approxi-
mately 20.2 to 1. If not within 2% of this ratio, the transformer's
secondary should be disconnected from the Starter module and a 1
kOhm resistor connected across the secondary. Measuring the voltage
across the 1 kOhm resistor should yield a voltage ratio of 20.17. Ratios
more than ±2% in error suggest a bad transformer. If the 1 kOhm
loaded ratio is within tolerance, but the UCP2 connected ratio is out of
tolerance, suspect a bad Starter module. Before replacing the Starter
module, double check the Unit Line Voltage programed in the Machine
Configuration Menu under Service Settings. It should match the name-
plate unit line voltage.
If the Under-Over Voltage Protection function continues to trip the unit,
and all of the above measured ratios are within tolerance, and all CLD
Under-Over Voltage setups have been verified, replace the Starter
module.
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