S
ection
7
If the turns ratio of the sensing potential transformer is incorrect, replace the sensing potential
transformer with the correct one.
If the sensing potential transformer is correct, proceed to Step 3.
Step 3. High generator output voltage may occur when operating in droop mode with a capacitive load.
If the high voltage condition is not caused by the droop function, proceed to Step 4.
Step 4. Replace the DVR2000E unit.
Poor Voltage Regulation
Step 1. Verify that the case of the DVR2000E is properly grounded.
If the DVR2000E is not properly grounded, connect a dedicated ground wire to the quarter-inch fast-on
connector labeled GND on the rear of the DVR2000E case.
If the DVR2000E is properly grounded, proceed to Step 2.
Step 2. Check for grounded eld leads.
If the eld leads are grounded, isolate them from ground.
If the eld leads are not grounded, proceed to Step 3.
Step 3. Check for grounded PMG leads.
If the PMG leads are grounded, isolate them from ground.
If the PMG leads are not grounded, proceed to Step 4.
Step 4. Verify that the generator frequency is not dropping below the DVR2000E underfrequency setpoint when
load is applied to the generator.
If the generator frequency is dropping below the underfrequency setpoint, reduce the setpoint if
possible. Also check the prime mover and generator for proper sizing in relation to the applied load.
If poor regulation is not related to DVR2000E underfrequency operation, proceed to Step 5.
Step 5. Verify that regulation is not being affected by normal droop operation.
If droop operation is not affecting regulation, proceed to Step 6.
Step 6. Replace the DVR unit.
Generator Output Unstable (Hunting)
Step 1. Verify that the governor for the prime mover is operating properly.
If the governor is not operating properly, troubleshoot using the manufacturer’s suggested procedures.
If the governor is operating properly, proceed to Step 2.
Step 2. Verify that the sensing and input power leads are connected securely.
If the sensing or input power leads are not connected securely, tighten the connections.
If the sensing or input power lead connections are secure, proceed to Step 3.
Step 3. Verify that the DVR2000E Stability Range is set to the proper range.
If the Stability Range setting is incorrect, reset the Stability Range.
If the Stability Range setting is correct, proceed to Step 4.
Step 4. Verify that the Stability Level is properly set.
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Main Index
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Section 7 Index
89
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