Festo Контроллеры двигателя CMMS-ST - Manual (Page 120)

8. Service functions and error messages
120 Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH
8. Service functions and error messages
8.1 Protective and service functions
8.1.1 Overview
The CMMS-ST has a comprehensive array of sensors which monitor the controller section,
power output stage, motor and external communication to ensure that they function
perfectly. All errors which occur are saved in the internal error memory. Most errors cause
the controller's controller enable to be switched off. A new enable is not possible until the
error memory has been cleared by acknowledging the error, and the error has been
rectified or is no longer present.
The following monitoring functions guarantee operational safety:
- Evaluation of the motor temperature (in preparation)
- Evaluation of the power section temperature
- Earth fault detection
- Detection of short-circuits between two motor phases
- Detection of overvoltages in the intermediate circuit
- Detection of faults in the internal voltage supply
If the 24 V supply voltage fails, approximately 20 ms remain to save parameters and shut
down the controller in a defined manner.
8.1.2 Overload current and short-circuit monitoring
The overload current and short-circuit monitoring is triggered as soon as the current in the
intermediate circuit exceeds twice the maximum current of the controller. It detects short
circuits between two motor phases and short circuits at the motor output terminals
against the positive and negative reference potential of the intermediate circuit and
against PE. If the error monitor detects overload current, the power output stage shuts
down immediately, guaranteeing that the system is short-circuit proof.
8.1.3 Voltage monitoring for the intermediate circuit
Voltage monitoring for the intermediate circuit is triggered as soon as the intermediate
circuit voltage leaves the operating voltage range. The power output stage is then
deactivated.
8.1.4 Temperature monitoring for the heat sink
The heat sink temperature of the power output stage is measured with a linear
temperature sensor. Temperature monitoring is triggered at temperatures below – 40°C
and above 85°C. A temperature warning is issued at 80℃.