X533 - Safe OFF
With the safe OFF option, the power supply for pulse transmission in
the power section can be interrupted by means of a safety relay. This
ensures that the unit cannot produce a rotating field when it is located
at a connected-up motor.
Even if the control electronics give start signals, the active part of the
motor cannot move.
This allows mechanical work on the motor or on coupled machine parts
to be performed with the power supply ON and without the motor being
electrically isolated from the unit.
♦ The safe OFF option does not provide any electrical isolation
between the motor terminals and the power section!
♦ When in the "safe OFF" condition, the motor terminals are live with
The safe OFF option is not suitabe for bringing a running motor to a
quick stop, because the control signals are switched OFF and the
motor is therefore braked by the coupled load only.
The safe OFF option consists of the safety relay and the terminals for
the relay control with a checkback signal contact.
Connectable cross-section: 1.5 mm² (AWG 16)
Terminal 1 is at the front when installed in units with housings up to 90 mm wide, and at
the rear when installed in units with housings more than 90 mm wide.
Terminal assignment for the "Safe OFF" option
24 V DC
DC 24 V
Imax = 1 A