6 Service functions and diagnostic messages
Festo – GDCP-CMMP-M0-HW-EN – 1511c – English 59
6 Service functions and diagnostic messages
6.1 Protective and service functions
6.1.1 Overview
The motor controller CMMP-AS-...-M0 has a complex array of sensors that monitor the controller sec
tion, power output stage, motor and external communication to ensure that they function excellently.
All diagnostic events which occur are saved in the internal diagnostic memory. Most errors cause the
controller section to switch off the motor controller and the power output stage. The motor controller
cannot be switched back on until the error is remedied and then acknowledged.
A complex system of sensors and numerous monitoring functions ensure operational reliability:
– Measurement of the motor temperature
– Measurement of the power output stage temperature
– Earth fault detection (PE)
– Detection of short-circuits between two motor phases
– Detection of overvoltages in the intermediate circuit
– Detection of faults in the internal voltage supply
– Collapse of supply voltage
– Detection of faults in conjunction with the functional safety engineering ( [X40] )
6.1.2 Phases and mains failure detection
The motor controllers CMMP-AS-...-11A-P3-M0 detect a phase failure in three-phase operation (phase
failure detection) or failure of several phases (network failure detection) of the mains supply at the
device.
6.1.3 Overload current and short-circuit monitoring
Overload current and short-circuit monitoring 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 control detects overload current, the power output
stage shuts down immediately, guaranteeing protection against short circuits.
6.1.4 Overvoltage monitoring for the intermediate circuit
The overvoltage monitoring for the intermediate circuit takes effect as soon as the intermediate circuit
voltage exceeds the operating voltage range. The power output stage is then deactivated.
6.1.5 Temperature monitoring for the heat sink
The heat sink temperature of the output end stage is measured with a linear temperature sensor. The
temperature limit varies between the device performance classes è Tab. A.3 on page 66.
A temperature warning is triggered approx. 5 °C below the limit value.
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