Festo CMSH - Page 55

Festo — CMSH — 2021-10
Commissioning
55
Value Description
INTERNAL Internal potentiometer
Factory setting for CMSH-S-...
EXTERNAL External potentiometer
Factory setting for CMSH-SE-..., cannot be changed
Tab. 66: Position sensor type
A change to the parameter requires a renewed initialisation
è
7.2.5 ‘Initialization’ menu.
Safety position
The ‘Safety position’ parameter defines the pneumatic initial position of the positioner in the event of
electrical power failure.
Value Description
FAIL SAFE Working port (2) is exhausted. The working port (4) is also pressurised
with double-acting drives.
FAIL IN PLACE Working port (2) and working port (4) are closed.
Tab. 67: Safety position
Exhaust position
The ‘Exhaust position’ parameter defines which position is displayed for a completely exhausted
working port (2). The effective direction of the drive can be changed with this parameter.
Value Description
0% Factory setting
100% —
Tab. 68: Exhaust position
vented
ventilated
Ventilation status chamber 2
Target position [%]
Fig. 31: Exhaust position