Information about line diagnostics and test pulses

For monitoring of the cabling, the output circuit uses test pulses and thus detects faults in the external wiring. This means the output voltage is interrupted briefly (pulsed). The maximum duration of the interruption can be set in the F-DO parameter Maximum test duration. The required duration of test pulses is determined by the capacitances in the connected load, which affect the line diagnostics.

A test pulse duration of 1 ms is to be used for the safe disconnection of MOVISAFE® CS..A with a maximum of 10 MOVIDRIVE® modular, MOVIDRIVE® system, and MOVIDRIVE® technology units.

Total capacitance must not exceed 1 µF with the maximum test pulse duration (5000 µs).

For the 24 V switching outputs F‑DO00 and F‑DO01, line diagnostics is always active regardless of the parameter setting.

WARNING

When line diagnostics is deactivated, the MOVISAFE® CS..A safety option cannot detect a short circuit between a sourcing output (F‑DO.._P) and the +24 V supply voltage, or between a sinking output (F‑DO.._M) and the reference potential.
Severe or fatal injuries.
Install the wiring in such a way that no short circuit is possible:
  • Between a sourcing output (F-DO.._P) and the +24 V supply voltage.
  • Or between a sinking output (F-DO.._M) and the reference potential.

The safe digital outputs F-DO00 and F-DO01 are equipped with an optional wire break monitoring. Wire break monitoring checks whether the connected actuator is consuming a minimum current. If the actuator current is below the minimum value, the MOVISAFE® CS..A safety option detects this as an open circuit.

Activate wire break monitoring only if you are sure that the current consumption of the actuator is always above the minimum current (see chapter Safe digital outputs).