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BECKHOFF
8.17.4
Functional description
The connector (X10) is mounted on the front panel of the AX2040/2070.The coil connections and a
make (n.o.) contact of a safety relay are made available through 4 terminals on this connector.
The 24VDC safety relay in the servo amplifier (approved) is controlled externally. All the relay con-
tacts have positive action.
Two contacts switch off the driver supply of the output stage in the servo amplifier, 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 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.
8.17.5
Signal diagram (sequence)
AX2040/2070 Product Manual
06/2007
Electrical Installation
71
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