Instruction Manual PUC 28
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5.5 Relays [ RELAY ]
The PUC 28 has two relays (in some variants of the PUC 28 these relay contacts are not
present). Relay 1 is triggered when the upper limits have been exceeded; relay 2 is triggered
when values fall below the lower limits. In the quiescent state, contacts 3/4 and 6/7 are closed
at the relay connector. If the signal drops below the limit, contacts 5/6 close and if the signal
exceeds the limit, contacts 2/3 close.
5.5.1 Switching conditions and relay test [ RELAY / COND. TEST ]
In this menu item, you specify which measured values are included in controlling the relays
(internal pressure, IN1 and IN2 input signal). This setting always applies to both the upper and
the lower limits of the corresponding signal.
Table 17: Switching conditions parameter description
Parameters Range of values
Default setting
Condition
Code
Internal
pressure
sensor
IN1
IN2
0
1
x
2
x
3
x
x
4
x
5
x
x
6
x
x
7
x
x
x
7 - All limits are included in the
relay control system
While setting the switching conditions, both relays are energized for test
purposes (until the final pressing of the Enter key).
