9440300990 30-3
DECS-250 Maintenance
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.
The 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).
USB Drivers Failed to Install Automatically
Perform the following steps to manually install the DECS-250 USB drivers.
1. In the Windows Device Manager, under Other Devices, right-click on DECS-250 and select
Properties. The Properties window will appear. (If DECS-250 is displayed as an “Unknown Device”,
restart the PC and repeat this step.)
2. In the Properties window, click the Update Driver button on the Driver tab.
3. Select “Browse my computer for driver software”.
4. Click Browse and navigate to the following directory: C:\Program Files\Basler Electric\USB Device
Drivers\USBIO
5. Click Next to install the drivers.
Support
Contact the Basler Electric Technical Services Department at 1-(618)-654-2341 for troubleshooting
support or to receive a return authorization number.
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