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7.4 ANALYSIS OF PUMP RELATED ALARMS DISPLAYED ON CONSOLE
1. PUMP VMN LOW
The pump chopper power output is feedback to the µC. If this feedback voltage is not
coherent with the applied PWM, this fault condition is signalled. There could be many
causes:
- failure in the pump chopper power section
- failure in the pump chopper driving section
- failure in the pump chopper voltage feedback circuit
- dispersion in the pump motor to truck frame.
2. PUMP STBY I HIGH
The pump chopper current sensor feedback is out of the zero-current window while no
PWM is applied to the pump chopper. The most likely cause is a failure in the current
sensor.
3. PUMP TEMPERATURE
Pump chopper temperature is higher than 75°C, maximum current is proportionally
reduced. If the alarm is present when the controller is cold, there is a failure in the
temperature sensor or in the feedback circuit.
4. PUMP
This is a warning in the MASTER controller, which inform that the SLAVE is in a pump
chopper related fault condition.
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