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1� 0 4REDCPT Controller Manual SOFT FAULT DESCRIPTION Mechanical Pump Occurs when the controller load is at maximum and the controller Problem output frequency is less than a preset threshold. Once the controller goes into current-regulation mode, any condition that increases motor load current forces it to drive the frequency down. Once the low-threshold frequency is reached, this fault is indicated. High amps at certain frequencies may indicate pump problems, such as dragging impellers, bearings, or internal parts in the pump and motor. Neuron The CPT has two processors that must continually communicate. Communication If communication fails, then leak detection cannot successfully Failure operate. No Dispenser Occurs if the pump does not come on (no dispense-enable signal) Activity within 72 hours. This feature can be deactivated for sites with low- volume dispensers, such as kerosene systems. Open Circuit Open circuits are wiring faults between the controller and the motor. Detected if the drive is On and the output current is less than the Open-circuit detection threshold. The processor retries every 5 seconds. If five consecutive occurrences of open circuit are recorded, the alarm triggers and the pump shuts down. (Note: The first four occurrences are soft faults; the fifth is a hard fault.) Over-current Detected if, during any period of operation, the over-current fault of the power module is activated. The processor automatically l retries every 5 seconds. If five consecutive occurrences of over- current are recorded, the alarm triggers and the pump shuts down. (Note: The first four occurrences are soft faults; the fifth is a hard fault.) Over temperature Occurs if, during any period of operation, the over-temperature fault of the power module is activated (i.e., when the temperature inside the controller gets too hot, >100°C in the power module). This may indicate fan failure. The thermal-measuring device on the power module communicates the Inverter board's temperature to the processor; if the Inverter board's temperature exceeds 100°C, the pump shuts down. (Note: The first four occurrences are soft faults; the fifth is a hard fault.) Peer In tandem operation, communication between the two CPT Communication Controllers must continually occur. If communication is lost, then Failure the tandem pump operation will not work properly. Pressure Detects the presence of the pressure transducer by monitoring the Transducer Failure signal. If the CPT Controller senses an abnormal voltage (without Leak sustained for 15 seconds, it indicates a fault condition. If leak Detection enabled) detection is disabled, the detection of the failed pressure transducer stops the control loop from running and will default the controller to run at a fixed frequency. } Chapter 5:Service and Repair 5-6 ARE260-240 Rev.A ♦ 6/97