Actuator (two-channel, sourcing/sinking output)

The input of the actuator must be isolated and without any connection to a reference potential. Inside the MOVISAFE® CS..A safety option there is a switching element between F-DO._M and the reference potential. With a non-floating actuator, this switching element would be bridged. The redundancy of the sourcing and sinking output would no longer apply.

Fault detection using line diagnostics

The MOVISAFE® CS..A safety option detects the following faults in the external cabling when the output is disabled or enabled:

  • Short circuit between sourcing output and a supply voltage that lies within the range of 15 to 30 V and has the same ground potential as the MOVISAFE® CS..A safety card.
  • Short circuit between the sinking output and the reference potential or a voltage < 6 V.

The MOVISAFE® CS..A safety option can also detect the following faults when the output is enabled:

  • Short circuit between different sourcing outputs
  • Short circuit between different sinking outputs
  • Short circuit between sourcing and sinking output
  • Short circuit between sourcing output and GND
  • Overload on each output
  • Open circuit (with F-DO., if activated)

[1]

Actuator 1

[2]

Actuator 2

INFORMATION

In the event of short circuits, a high short-circuit current can occur for a short time. Depending on the DC 24 V supply voltage used, this can cause a voltage dip that limits the operation of MOVIDRIVE® modular or MOVIDRIVE® system and/or individual assemblies.
If the voltage supply is not stable enough, it can result in a reset and a restart of the MOVISAFE® CS..A safety option
  • Make sure the voltage supply does not break down in the event of short circuits at the output.

The sourcing/sinking output connection variant is suitable for applications up to SIL 3 according to EN 61508 and Performance Level e according to EN ISO 13849-1.

Connect the actuator between F-DO.._P and F-DO.._M. The actuator can still be switched off in case of a crossfault in one of the connection leads, because the MOVISAFE® CS..A safety option disconnects the sourcing and the sinking output terminal.