Marathon Electric DVR 2000E - LOSS of GENERATOR SENSING Indicator Is Annunciating; OVEREXCITATION LIMITING Indicator Is Annunciating; OVEREXCITATION SHUTDOWN Indicator Is Annunciating

44
S
ection
7
OVEREXCITATION SHUTDOWN Indicator Is Annunciating
Step 1. Verify that the fi eld overvoltage setpoint is adjusted properly.
If not properly adjusted, readjust the fi eld overvoltage setpoint.
If properly adjusted, proceed to Step 2.
Step 2. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 3.
Step 3. Replace the DVR
®
2000E.
If replacing the DVR
®
2000E does not correct the malfunction, proceed to Step 4.
Step 4. Refer to the generator manual. Generator is defective.
LOSS OF GENERATOR SENSING Indicator Is Annunciating
Step 1. Verify that the voltage sensing leads are properly connected.
If the sensing leads are not properly connected, correct the connections.
If the sensing lead connections are correct, proceed to Step 2.
Step 2. For single-phase sensing, verify that E2 and E3 are connected.
If E2 and E3 are not connected, connect them both to phase C sensing voltage.
If E2 and E3 are properly connected, proceed to Step 3.
Step 3. Verify that the sensing potential transformer (if used) has the correct turns ratio and is functioning
properly.
If the sensing potential transformer has the wrong turns ratio or is malfunctioning, replace it.
If the sensing potential transformer is correct and functioning properly, proceed to Step 4.
Step 4. Verify that the generator output voltage is present on all phases.
If the generator is missing a phase, refer to the generator manual. Generator is defective.
If generator output voltage is balanced on all phases, proceed to Step 5.
Step 5 Replace the DVR
®
2000E.
OVEREXCITATION LIMITING Indicator Is Annunciating
Step 1. Check for generator overloading.
If the generator is operating with a larger than rated load, shed load.
If the generator is operating with a rated or less than rated load, proceed to Step 2.
Step 2. Verify that the DVR
®
2000E output (fi eld) current limit is not set too low.
If the output current limit setpoint is too low, adjust for the proper setting.
If the output current limit is set properly, proceed to Step 3.
Step 3. Verify that the generator exciter fi eld is not shorted.
If the generator exciter fi eld is shorted, replace the generator exciter.
If the generator exciter fi eld is not shorted, proceed to Step 4.