SCHIEBEL ACTUSAFE CMFS - Failsafe-Direction; Moving-Behaviour of the Actuator; Moving Behaviour Electrical Mode; Moving Behaviour Failesafe Mode

4 General Information
Operating Manual Linear ACTUSAFE CMFS(L)
OM-ENGLISH-Failsafe-Linear-16xx-V2.00-2022.03.03
3.1 Failsafe-direction
This type of failsafe actuator can be built in a version for „Failsafe: stem move out“ or „Failsafe: stem move in“. A subse-
quent change of failsafe direction is not possible!
3.2 Moving-behaviour of the actuator
How the actuator moves to the end limits depends on whether the actuator is in failsafe mode or in electrical mode.
3.2.1 Moving behaviour electrical mode
• Moving in failsafe direction
In this case the actuator moves in failsafe direction electrically by motor till the adjusted electrical end position. If the
end limit is set travel dependent the actuator stops at this point. If the end limit is set force dependent the actuator
moves electrically till the end position. In the end position the electrical holding brake is released and the actuator
build up the force by the tensioned spring.
NOTE: For force dependent end limit the end position should be set in a sufficient range before the mechanical
end position to avoid damage on the valve.
• Moving counter failsafe direction
The actuator moves to the end position electrically by motor. If the end limit is set force dependent the force is build
up by the motor.
NOTE: For force dependent end limit the end position should be set in a sufficient range before the real end po-
sition to avoid damage on the valve.
3.2.2 Moving behaviour failesafe mode
• Moving in failsafe direction
In failsafe mode the actuator can only move in failsafe direction. When the electrical holding brake is released the
actuator moves against the end limit by spring. In this case the end limit is generally force dependent. The force in
end position is build up by the residual spring force. If the end limit should be travel dependent this is only possible by
changing the mechanical connection to the valve so the actuator reaches the internal end stop before the end stop
of the valve.
CAUTION: The mechanical end stops in the actuator are not designed to move against them by torque regu-
larly!
4 General Information
4.1 Serial number
See Operating Manual ACTUSMART CM.V1.2, section 2.2, page 23
4.2 Protection class
See Operating Manual ACTUSMART CM.V1.2, section 2.4, page 24
4.3 Mounting position
See Operating Manual ACTUSMART CM.V1.2, section 2.5, page 24
4.4 Direction of rotation
The standard direction of rotation for the actuator is:
• Clockwise = actuator stem to be retracted (move in)
• Counter-clockwise = actuator stem to be extended (move out)
All the information in this Operating Manual refers to the standard direction of rotation.
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