8
Service functions and diagnostic messages
Festo – GDCP-CMMP-M3-FW-EN – 1203NH
77
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 exceeds 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 device. A temperature warning is triggered at about 5°C below
the limit value.
8.1.6
Monitoring of the motor
The motor controller CMMP-AS-...-M3 has the following protective functions for monitoring the motor
and the connected shaft encoder:
Protective func-
tion
Description
Monitoring the
shaft encoder
An error of the shaft encoder causes the power output stage to be switched off.
For the resolver, for example, the tracking signal is monitored. For increment
generators, the commutator signals are checked. Generally true for intelligent
encoders is that their various error messages are evaluated and reported to the
CMMP-AS-...-M3 as common error E 08-8.
Measurement and
monitoring of the
motor temperat-
ure
The motor controller CMMP-AS-...-M3 has a digital and an analogue input for
recording and monitoring the motor temperature. The following temperature
sensors can be selected:
–
[X6]:
Digital input for PTCs, N/C contacts and N/O contacts.
–
[X2A] and [X2B]:
N/C contact 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-...-M3 has I
2
t monitoring to limit the average power loss in the power
end stage and in the motor. Since 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 chopper. 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” “Overvoltage in the intermediate circuit” is generated
if the braking process is not yet finished and (too much) energy is fed back to the 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.
Summary of Contents for CMMP-AS-***-M3 Series
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