9287500991 Rev K DECS-100 Maintenance and Troubleshooting 6-7
No Voltage Matching
Step 1. Verify that the Voltage Matching option was purchased and is enabled in the software.
If not enabled, use the BESTCOMS software to turn on voltage matching.
If voltage matching is enabled, proceed to Step 2.
Step 2. Verify that all connections are correct according to Figures 4-6 through 4-9 as required for the
Voltage Matching option of the DECS-100.
If the interconnection is incorrect, reconnect according to the appropriate interconnect diagram.
If the interconnection is correct, proceed to Step 3.
Step 3. Verify that the DECS-100 VM/VMC contact input is closed.
If the VM/VMC contact input is open, it must be closed to enable voltage matching.
If the VM/VMC contact input is closed, proceed to Step 2.
Step 4. Check for correct utility reference voltage on DECS-100 terminals B1 and B3.
If the interconnection is incorrect, reconnect according to the appropriate interconnect diagram.
If the interconnection is correct, check for open system fuses.
Verify that the potential sensing transformer, if used, is connected to DECS-100 terminals B1
and B3.
If potential sensing transformer connections are correct, proceed to Step 5.
Step 5. Verify that the generator output voltage setpoint is within 10 percent of the measured utility bus
voltage.
If the setpoint is too low or too high, adjust the setpoint to the appropriate level.
If the setpoint is correct, proceed to Step 6.
Step 6. If the above steps fail to correct the Voltage Matching malfunction, replace the DECS-100.
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