
9. Service functions and error messages
90
Festo P.BE-CMMP-AS-3A-HW-EN 0708NH
9.1.5
Motor monitoring
The CMMP-AS servo positioning controller has the following protective functions to moni-
tor the motor and the connected shaft encoder:
Shaft encoder
monitoring:
Faults in the shaft encoder causes the power output stage to be
switched off. For the resolver (e.g.) the tracking signal is monitored.
For incremental encoders, the commutator signal is checked. Other
"intelligent" encoders have additional error detection.
Measurement and
monitoring of the
motor temperature:
The CMMP-AS servo positioning controller has a digital and an ana-
logue input for recording and monitoring the motor temperature.
Analogue signal recording means that non-linear sensors are also
supported. The following temperature sensors can be selected.
At [X6]:
Digital input for PTCs, N/C contacts and N/O contacts.
When using EMMS-AS + NEBM- (Festo Motor + cable), digital motor
monitoring with NC contacts is used.
At [X2A] and [X2B]: NC contact and KTY series analogue sensors. Other sensors
(NTC, PTC) may require corresponding SW adjustments.
9.1.6
I²t monitoring
The CMMP-AS servo positioning controller has l²t monitoring to restrict the average power
loss in the power output stage and in the motor. As the power loss which occurs in the
power electronics and in the motor increases by its square as the current flow increases in
a worst case scenario, the square of the current value is usually assumed for the power
loss.
9.1.7
Power monitoring for the brake chopper
There is a power monitoring system for the internal braking resistor in the operating soft-
ware.
9.1.8
l²t monitoring of the PFC stage
There is an l²t monitoring system for the PFC in the operating software.
9.1.9
Commissioning status
Servo positioning controllers sent to Festo for servicing have other firmware and parame-
ters loaded for testing purposes.
The CMMP-AS servo positioning controller must be parameterised before it is commis-
sioned again at the customer's premises. The parameterising software queries the com-
missioning status and prompts the user to configure the servo positioning controller. At
the same time, the device indicates that it is ready for operation but has not yet been con-
figured by displaying 'A' on the seven segment display.
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