Chapter 5 System Operation
890 USE 120 00 85
Description of the restart lock -AS-
Functional
description
The connector (X10) is mounted on the front panel of the Lexium 17 D. The coil
connections and a make (n.o.) contact of a safety relay are available through 4
terminals on this connector.
Two contacts switch off the driver supply of the output stage in the servo amplifier,
and short the internal setpoint signal to Analog Com (0 V).
The make (n.o.) contact used for monitoring is looped into the control circuit.
If the safety relay is not energized, then the monitoring contact is open and the
servo amplifier is ready for operation.
If the drive is electronically braked, the servo amplifier is disabled and the motor-
holding brake is on, then the safety relay is energized (manually or by the controls).
The supply voltage for the driver circuit of the output stage is switched off in a safe
manner, the internal setpoint is shorted to 0V, and the monitoring contact bridges
the safety logic in the control circuit of the system (monitoring of protective doors
etc.)
Even if the output stage or driver is destroyed, it is impossible to start the motor.
If the safety relay itself is faulty, then the monitoring contact cannot bridge the
safety logic of the system. Opening the protective devices will then switch off the
system.
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