9440300990 Rev J
287
DECS-250
Maintenance
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-250 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-250 drive voltage. If the problem is caused by the DECS-250, 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-250 is connected to a CT on phase B and not
phases A or C.
No Communication
If communication with the DECS-250 cannot be initiated, check the connections at the communication
ports, the baud rate, and supporting software.
DECS-250 Reboots Frequently
If a single DECS-250 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-250 will
reboot. Increase the control power source voltage so that it is within the specified operating range. Units
with style number Lxxxxxx have an input voltage range of 16 to 60 Vdc. Units with style number Cxxxxxx
have an input voltage range of 90 to 150 Vdc or 82 to 132 Vac (50/60 Hz).
Support
Contact the Basler Electric Technical Services Department at 1-(618)-654-2341 for troubleshooting
support or to receive a return authorization number.
Summary of Contents for DECS-250
Page 2: ......
Page 6: ...iv 9440300990 Rev J Revision History DECS 250 ...
Page 16: ...xiv 9440300990 Rev J Contents DECS 250 ...
Page 20: ...4 9440300990 Rev J Introduction DECS 250 ...
Page 28: ...12 9440300990 Rev J Power Stage DECS 250 ...
Page 32: ...16 9440300990 Rev J Voltage and Current Sensing DECS 250 ...
Page 40: ...24 9440300990 Rev J Synchronizer DECS 250 ...
Page 52: ...36 9440300990 Rev J Auxiliary Control DECS 250 ...
Page 56: ...40 9440300990 Rev J Contact Inputs and Outputs DECS 250 ...
Page 84: ...68 9440300990 Rev J Limiters DECS 250 ...
Page 114: ...98 9440300990 Rev J Power System Stabilizer DECS 250 Figure 96 PSS Parameter Settings ...
Page 124: ...108 9440300990 Rev J Stability Tuning DECS 250 ...
Page 126: ...110 9440300990 Rev J Mounting DECS 250 Figure 103 Overall and Projection Mounting Dimensions ...
Page 127: ...9440300990 Rev J 111 DECS 250 Mounting Figure 104 DECS 250 Escutcheon Plate Dimensions ...
Page 198: ...182 9440300990 Rev J Timekeeping DECS 250 ...
Page 210: ...194 9440300990 Rev J CAN Communication DECS 250 ...
Page 304: ...288 9440300990 Rev J Maintenance DECS 250 ...
Page 316: ...300 9440300990 Rev J Specifications DECS 250 ...
Page 334: ...318 9440300990 Rev J Analog Expansion Module DECS 250 ...
Page 351: ......