7 General
Installation manual PMCprimo Drive2
Page 29
7.14.3 Functional description
An additional connector (X12) is mounted on the front panel of the PMCprimo Drive2. The coil
connections and a make (n.o.) contact of a safety relay are made available through 4 terminals on
this connector.
The 24V DC safety relay in the servo amplifier (TÜV approved) is controlled externally. All the relay
contacts have positive action.
Two contacts switch off the driver supply of the output stage in the PMCprimo Drive2, and short the
internal setpoint signal to AGND (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 PMCprimo Drive2 is
ready for operation.
If the drive is electronically braked, the PMCprimo Drive2 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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General