8 Service functio ns and diagnostic messages
Festo – GDCP-CMMP-M0-FW-E N – 1304N H 77
8 Service functions and diagnostic messages
8.1 Protective and service functions
8.1.1 Overview
The motor controller CMMP-AS-...-M0 has complex sensors that monitor proper func tioning of the mo-
tor controller section, power output stage, motor and external communication. All diagnostic events
which occur are saved in the internal diagnostic memory. The diagnostic memory in the motor controller
has a two-stage design:
– All messages since the motor controller was last switched on are saved in the temporary memory
(these are lost in the event of a power failure).
– In the permanent memory of the motor c ontroller CMMP-AS -...-M0 the messages are permanently
saved (secure in the event of a mains failure). This memory consists of 2 segments that are filled
one after the other. When both segments are full, the older segment is automatically cleared. This
means t hat a sort of ring memory is available for the permanently sa ved messages.
Most errors cause the motor controller section to switch off the motor controller and the power output
stage. The motor controller can only be switched on again when the error has been eliminated and then
acknowledged.
For some of the diagnostic messages, the behaviour of the motor controller can be paramete rised.
Possible reactions:
– PS off Switch off power section immediately
– MCStop Stop with maximum peak c urrent
– QStop Quick stop with the deceleration specified on the “Axis” (FCT) page
– Warn Output of a warning
– Ignore No message, only entry in diagnostic memory
– NoLog No message and no entry in diagnostic memory.
A complex system of sensors and numerous monitoring functions ensure operational reliability:
– Measurement of the motor temperature
– Measurement of the power output stage temperature
– Ear th fault detection (PE)
– Detection of short-circuits between two motor phases
– Detection of overvoltages in the intermediate c ircuit
– Detection of faults in the internal voltage supply
– Collapse of supply voltage
8.1.2 Phases and mains failure detection with 3-phase motor controllers
The motor controller CMMP-AS-...-M0 detects a phase failure in three-phase operation (phase failure
detection) or failure of several phases (mains failure detection) of the mains supply at the device.
8.1.3 Overload current and short-circuit monitoring
Overload current and short-circuit monitoring detects short c ircuits 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.
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