Load Bank Troubleshooting


These recommended checks are meant to guide an experienced technician through investigation of a few of the most common load bank issues. A certain level of electrical knowledge and familiarity with electrical drawings is assumed. These checks may or may not apply to your load bank. See the Load Bank Operator's Manual and Drawings Package that was provided with the unit for verification and details.

If these checks do not pinpoint the problem or if more information is needed call the Simplex Service Department at 800-637-8603.

COOLING FAN MOTOR WILL NOT START/OPERATE FAN FAILURE INDICATED FAN OVERLOAD INDICATED HIGH EXHAUST TEMP INDICATED OPEN THERMOCOUPLE INDICATED HIGH INTAKE TEMP INDICATED HMI/PLC COMM ERRORS OTHER HMI ISSUES REDUCED KW OUTPUT OR PHASE IMBALANCE METER COMM ERROR INDICATED METERING ISSUES AUTOMATIC LOAD LEVELING ISSUES

Cooling Fan Motor Will Not Start/Operate

  1. Check for presence of correct fan/control power.
  2. Check Fan Circuit Breaker (FCB) is closed.
  3. Check fan circuit Overload Relay (OLR). Reset if tripped.
  4. Check that Fan Motor Contactor (FMC) closes.
  5. Check that the pilot relay for the FMC closes (See drawings for details).
  6. Ensure the PLC is in Run mode (generally, Power and Run indicators on PLC are lit).
WARNING
It is sometimes necessary to have control power energized when troubleshooting in a load bank cabinet. Be aware that load banks may have multiple sources of power (test source power, fan/control power, anti-condensation heater power, etc.). Remove as much power as possible before troubleshooting. When control cabinet doors are open, treat every component and circuit as though it were live and always use all appropriate PPE.