Service functions and error messages
Page 117
11.1.3
Overcurrent and short-circuit monitoring
The overcurrent and short-circuit monitoring system detects short circuits between two motor phases and short circuits at the
motor output terminals against the positive and negative reference potential of the DC bus circuit and against PE. If the error
monitoring system detects an overcurrent, the power output stage will be shut down immediately to guarantee resistance
against short circuits.
11.1.4
Overvoltage monitoring of the DC bus circuit
The overvoltage monitoring system of the DC bus circuit responds as soon as the DC bus circuit voltage exceeds the operating
voltage range. As a result, the power output stage will be switched off.
11.1.5
Temperature monitoring of the heat sink
The heat sink temperature of the power output stage is measured with a linear temperature sensor. The temperature limit
varies from device to device.
11.1.6
Monitoring of the motor
The item Servo Positioning Controller C 3-Series has the following protective functions to monitor the motor and the connected
shaft encoder:
Monitoring of the shaft encoder: An error of the shaft encoder leads to the shut-down of the power output stage. In the case of
a resolver, the track signal is monitored, for example. In the case of incremental encoders, the commutation signals are
checked. Other "intelligent" encoders have other error detection features.
Measurement and monitoring of the motor temperature: The item Servo Positioning Controller C 3-Series has a digital and
analogue input for measuring and monitoring the motor temperature. Thanks to the analogue signal detection method, also
non-linear sensors are supported.
The following temperature sensors can be selected:
At [X2A], [X2B] and [X6]: Input for PTCs, NTCs, normally closed contacts, normally open contacts and analog
sensors, type KTY.
11.1.7
I²t monitoring
The item Servo Positioning Controller C 3-Series has an I²t monitoring system to limit the average power loss in the power
output stage and in the motor. Since the power loss in the electronic power system and in the motor increases in a square
manner with the current in the worst case, the squared current value is taken as the measure for the power loss.
