8 Service functio ns and diagnostic messages
78 Festo – GDCP-CMMP-M0-FW-E N – 1304NH
8.1.4 Overvoltage monitoring for the intermediate circuit
The overvoltage monitoring for the intermediate circuit takes effect as soon as the intermediate circuit
voltage exc eeds the operating voltage range. The power output stage is then deactivated.
8.1.5 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 from device to devic e. A temperature warning is triggered at about 5 °C below
the limit value.
8.1.6 Monitoring of the motor
To monitor the motor and the connected shaft encoder, the motor controllerCMM P-AS-...-M0has the
following protective functions:
Protective function
Description
Monitoring the
shaft encoder
An error of the shaft enc oder c auses the power output stage to be switched off.
With the resolver, the tracking signal is monitored, for example. For inc remental
encoders, the commutation signals are checked. In general, for intelligent
encoders, their various error messages are evaluated and reported at the
CMM P-AS-...-M0 as common error E 08-8.
Measurement and
monitoring of the
motor temperature
The motor controller CMMP-AS-...-M0 has a digital and an analogue input for
recording and monitoring the motor temperature. The following temperature
sensors can be selected:
– [X6]: Digita l input for PTCs, N/C contacts a nd N/O contacts.
– [X2A] and [ X2B] : N/C c ontact and KTY series analogue sensors.
(Only for parameterisation of user-defined motors)
Tab. 8.1 Protective functions of the motor
8.1.7 I
2
t monitoring
The motor controller CMMP-AS -...-M0 has an I
2
t monitoring to limit the average power dissipation in
the power output stage and the motor. S ince the power loss that occurs in the power electronics and
the motor can, in the worst case, grow at a rate equal to the square of the flowing current, the squared
current value is taken as a measure for the power loss.
8.1.8 Power monitoring for the brake chopper
The braking resistors are monitored on the firmware side through the function I
2
t brake choppe r. When
the output monitoring reaches “I²t brake chopper” of 100 %, the output of the internal braking resistor
is switched back to rated output.
As a result of this switch back, the error “E 07-0” “Over voltage in the intermediate circuit” is generated
if the braking process is not yet finished and ( too much) energy is fed back to the motor controller.
In addition, the brake chopper is protected by means of overcurrent detection. If a short circuit is detec-
ted via the braking resistor, the brake chopper controller is switched off.
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