8-2 Maintenance DECS-200
c. Generator PT secondary voltage
d. Overexcitation limiter (not activated)
e. Accessory inputs (should be zero)
f. Var/PF and droop (should be disabled)
g. Cut-in underfrequency setting (should be below the generator operating frequency)
If the problem persists, contact the Basler Electric Technical Sales Support department for advice.
High Generator Voltage in AVR Mode
Check the following DECS-200 settings and system parameters:
a. AVR voltage setpoint
b. Generator potential transformer (PT) primary voltage
c. Generator PT secondary voltage
d. Accessory inputs (should be zero)
e. Var/PF and droop (should be disabled)
If the problem persists, contact the Basler Electric Technical Sales Support department for advice.
Generator Voltage Unstable (Hunting)
Verify that the exciter power converter is working correctly by substituting the appropriate battery voltage
in place of the DECS-200 drive voltage. If the problem is caused by the DECS-200, check the gain
settings for the specific mode of operation selected.
If the problem persists, contact the Basler Electric Technical Sales Support department for advice.
Protection or Limit Annunciation
If a protection function or limiting function is annunciated, check the associated setting values.
If the problem persists, contact the Basler Electric Technical Sales Support department for advice.
HMI Meter Readings Incorrect
If your PF, var, or watt readings are significantly different from the expected readings for a known load,
verify that the B-phase current sensing input of the DECS-200 is connected to a CT on phase B and not
phases A or C.
No Communication
If communication with the DECS-200 cannot be initiated, check the connections at the communication
ports, the baud rate, and supporting software.
DECS-200 Reboots Frequently
If a single DECS-200 control power source is used and the power source is supplying less than the
minimum required voltage or is fluctuating below the minimum required voltage, the DECS-200 will
reboot. Increase the control power source voltage so that it is within the specified operating range. Units
with style number XL have an input voltage range of 16 to 60 Vdc. Units with style number XC have an
input voltage range of 90 to 150 Vdc or 82 to 132 Vac (50/60 Hz).
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