ULB ULB-R110-480-240-IP, Инструкция по эксплуатации

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Troubleshooting
1) No Main Power to 120 VAC Control Circuits.
 External 120VAC power cord is not connected to the load bank or 120VAC external control
power is not turned on.
 External Control Power Main Switch or circuit breaker is not closed.
 Terminals damaged during shipment.
 Control Circuit Fuse is blown (check and replace as required).

Dirty or loose connections or faulty Main Power Switch.
2) Cooling fans Not Operating.
 No External control Power.
 Loose or broken connection at fans terminal blocks, contactor etc.
 Fan / Control circuit fuse is blown.
 Fan current low switch is tripped (Current Sense Indication on HMI – Safety Screen)
 Fan blades jam.
3) Over-Temp fault indication on HMI Display.
 Obstruction or restriction of air flow at Load Bank cold-air intake or hot-air exhaust.
 Cooling fans are not operating.

Fan current low switch is actuated indicating fan(s) failure.

Check for proper cooling fan operation and proper direction of airflow.
 Over-Temp switch or Over-Temp auxiliary relay is malfunctioning or not operating correctly.
 Loose or broken connection at temperature switch terminal / blocks.
6) Voltage detection fault on HMI Display
 Wrong 3phase input power (480/240VAC) on CAM-LOK connectors.

Input power voltage is higher or lower than allowed tolerances.
7) Over voltage fault indication on HMI screen:
 Input power voltage is higher than allowed tolerances.
8) Fan fault Indication:

Cooling fans failure.
9) Current Sense Fault on HMI display
 3 Phase Current Imbalance due to 3 phase voltage imbalance.
 Blown load step fuse in branch load circuit (check and replace as necessary).
 Loose bus bar or loose connection at resistor terminal or fuse (tighten all bus bar and
connection points as required).

Resistor element failure and burned open (replace as necessary).
10) Load Step or Load step application circuit cannot be energized.
 Cooling fan failure, Over-Temp, Wrong Voltage also see item 2 thru 8 above.
 Load Dump switch is operated. One or more of the branch circuit load step fuses for the
load step in question is blown (check and replace as necessary).
 One or more of the load step resistor for the load step in question has failed or burned open
(check and replace as necessary).
 Load step contactor has failed or is inoperative due to loose connection or failed-open coil.
10) Load Step energized without rated load, or un-balanced load.
 Applied main input bus voltage from power source under test is de-rated, low, imbalanced
or inadequate.
 Contactor failure or not closing properly. Loose connection.

One or more of the branch circuit load step fuses for the load step in question is blown
(check and replace as necessary).