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3.4.5 Adjusting low and high alarm limits (supplem. modules for digital feedback)
For positioners with a supplementary module for "digital feedback" the low and high
alarm limits are adjusted electronically. Adjustment is only possible after the positioner
has been mounted to the actuator and after an Autostroke has been performed. For
details refer to the section about operating level 1, "Display 3 = Setting of switches".
3.4.6 Adjusting low and high alarm limits (supplementary "mechanical kit for digital
feedback")
For positioners with the supplementary module "mechanical kit for digital feedback" the
low and high alarm limits are set mechanically. Adjustment is only possible after the posi-
tioner has been mounted to the actuator and after an Autostroke has been performed.
Observe the direction of action of the "NC" and NO" switches.
Direction of action NC
Direction of action NO
The TZID positioner has two screws for alarm limit adjustment (see Fig. 21). The screws
are protected against unwanted turning. To adjust the alarm limits, push in the adjust-
ment screws with a screw driver to enable snapping in. Before making the mechanical
adjustment, set the actuator manually to the desired switching position (see section
about operating level 1, "Manual control"). The low and the high alarm limit have to be
adjusted separately.
Fig. 21
Adjusting alarm limits
28
Control lug out of proximity switch
-> state 1 (control current > 3 mA)
Control lug within proximity switch
-> state 0 (control current < 1 mA)
Control lug out of proximity switch
-> state 0 (control current < 1 mA)
Control lug within proximity switch
-> state 1 (control current > 3 mA)
3
2
1
1 low
2 high
Electro-pneumatic positioner TZID
42/18-54 EN
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