Basler SR4A Instruction Manual page 37

MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. VOLTAGE HIGH AND UNCONTROLLABLE WITH VOLTAGE ADJUST RHEOSTAT.
Step 1. Check for sensing voltage at terminals E1, E2, and E3.
If sensing voltage is not present, repair wiring.
If sensing voltage is present, proceed to step 2.
Step 2. Check that the transfer switch (if used) is in AUTO position. (If transfer switch is not
used, proceed to step 3.)
If transfer switch is not in AUTO position, place in AUTO.
If transfer switch is in AUTO position, proceed to step 3.
Step 3. Check for a shorted external Voltage Adjust Potentiometer (R1).
If Voltage Adjust Potentiometer is shorted, replace Voltage Adjust Potentiometer.
If Voltage Adjust Potentiometer is not shorted, proceed to step 4.
Step 4. Verify that the sensing transformer is set to the proper tap.
If transformer tap is improperly selected, reconnect to proper tap.
If transformer tap is properly selected, proceed to step 5.
Step 5. Check for a faulty relay (K1).
If relay K1 is defective, replace relay.
If relay K1 is not defective, proceed to step 6.
Step 6. If the above steps fail to correct the malfunction, replace or repair the voltage regulator
as necessary.
4. VOLTAGE HIGH AND CONTROLLABLE WITH VOLTAGE ADJUST RHEOSTAT.
Step 1. Check that the sensing transformer is set to the proper tap.
If transformer tap is improperly selected, reconnect to proper tap.
If transformer tap is properly selected, proceed to step 2.
Step 2. Check that Voltage Range Adjust Potentiometer (R3) is not set too high.
If Voltage Range Adjust Potentiometer is set too high, adjust potentiometer.
If Voltage Range Adjust Potentiometer setting is within limits, proceed to step 3.
Table 5-3. Troubleshooting Chart - Continued.
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