Festo Контроллер двигателя CMMD-AS - Manual (Page 119)

8. Service functions and error messages
Festo P.BE-CMMD-AS-HW-EN 1002NH 119
8. Service functions and error messages
8.1 Protective and service functions
8.1.1 Overview
The CMMD-AS motor controller has a comprehensive array of sensors that 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 section to deactivate the motor controller and the final output
stage to switch off. The motor controller can only be switched on again when the error
memory has been cleared by acknowledging the errors and the errors have been rectified
or are no longer present.
The following monitoring functions guarantee operational safety:
- Temperature monitoring for motor and power section
- Short circuit monitoring of the output stage
- Detection of overvoltages and undervoltages in the intermediate circuit
- I
2 t monitoring
- Standstill monitoring.
If the 24 V supply voltage fails, approximately 20 ms remain, for example to save
parameters and shut down the controller in a defined manner.
8.1.2 Temperatur monitoring for motor and power section,
shaft encoder monitoring
Faults in the shaft encoder causes the power output stage to be switched off. For
incremental encoders, the commutator signal is checked.
Measurement and
monitoring of the
motor temperature: The motor controller CMMD-AS has a digital input at [X6.1/2] to
record and monitor the motor temperature for EMMS-AS motors.
8.1.3 Short-circuit monitoring of the output stage/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.
With the motor, two of the three phases are measured separately and fed to the current
controller. Current measurement is also used to detect short circuits and overload
currents. The output stage is short-circuit-proof against closures after U_ZK+, U_ZK-, PE
and between any two motor phases.