9287500991 Rev K DECS-100 Maintenance and Troubleshooting 6-1
SECTION 6 • MAINTENANCE AND TROUBLE-
SHOOTING
PREVENTIVE MAINTENANCE
The only preventive maintenance required on the DECS-100 is to periodically check that the connections
between the DECS-100 and the system are clean and tight. DECS-100 units are manufactured using
state-of-the-art, surface-mount technology. As such, Basler Electric recommends that no repair
procedures be attempted by anyone other than Basler Electric personnel.
Storage / Electrolytic Capacitors
This device contains long-life aluminum electrolytic capacitors. For devices that are not in service (spares
in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once
per year.
TROUBLESHOOTING
If you do not get the results that you expect from the DECS-100, first check the programmable settings for
the appropriate function. Use the following troubleshooting procedures when difficulties are encountered
in the operation of your excitation system.
Generator Voltage Does Not Build
Step 1. Verify that all wiring is properly connected. Refer to Figures 4-6 through 4-10.
If wiring is improperly connected or loose, reconnect wiring properly.
If wiring connections are correct, proceed to Step 2.
Step 2. Verify that the generator is spinning at rated speed.
If the generator is not up to rated speed, increase generator speed to the rated value.
If the generator is spinning at rated speed, proceed to Step 3.
Step 3. For PMG power, check for correct input power to the DECS-100. Refer to Section 1, General
Information, Specifications for input power requirements.
If voltage is not present, refer to the generator manual for repair procedures (PMG system
only).
If voltage is present, proceed to Step 4.
Step 3a. If the DECS-100 is being shunt powered (non-PMG) mode, verify that the residual voltage
applied to the power input is at least 6 Vac.
If the applied voltage is less than 6 Vac, refer to the generator manual and flash the generator
field.
If the applied voltage is 6 Vac or greater, proceed to Step 4.
Step 4. Verify that no fuses are open.
Replace any open fuses.
If no fuses are open, proceed to Step 4.
Step 5. Verify that the front panel Overexcitation Shutdown indicator is not lit.
If the front panel Overexcitation Shutdown indicator (field voltage) is lit, check the generator
and/or load conditions. Interrupt input power or shut down the generator for a minimum of one
minute.
If the front panel Overexcitation Shutdown indicator is not lit, proceed to Step 6.
Step 6. Verify that the front panel Overexcitation Limiting indicator is not lit.
If the front panel Overexcitation Limiting indicator is lit, check the generator and load conditions.
Also check the field current limit setpoint for the correct level. Interrupt input power or shut
down the generator for a minimum of 1 minute.
If the front panel Overexcitation Limiting indicator is not lit, proceed to Step 7.
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