4 | Commissioning
FISCHER Mess- und Regeltechnik GmbH
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BA_EN_MA15_ATEX
4.3 Switch point setting
There is an adjustment lock attached to the front pane of the measuring unit on
units with installed limit signal encoders. Using the detachable adjustment key,
the contacts attached to the target indicators can be set to any point along the
scale.
To facilitate switching precision and the service life of the mechanical measur-
ing system, the switching points should lie between 10% and 90% of the meas-
uring range.
Set-point display
Drive pin
Drive arm
Adjustment key
Adjusting lock
Fig. 11:
Contact element
1. Place the adjustment key on the axle of the adjusting lock
2. Press axle inwards until the drive arm reaches behind the setting pin of the
target value indicator.
3. Set the target value indicator to the required switch point by turning the key.
4. Relieve the axle, remove the adjustment key
Contact function
Function 1: Close contacts for increasing display in clockwise direction.
Function 2: Open contacts for increasing display in clockwise direction.
Contact assignment:
Up to three contacts are available depending on the unit version.
1. Contact left target indicator
2. Contact middle target indicator
3. Contact right target indicator
4.4 Units with a rotation angle transducer
The capacitive rotation angle transducer records the angle setting of the indic-
ator in a contact-free manner and changes this into an measurement that is pro-
portional to the AC current signal. The device is configured in the factory before
delivery and cannot be reset on site.
