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Safety function
The safety function defines the operation principle of the output relays.
Maximum safety:
Minimum safety:
For both output relays, A and B, the safety function can be set separately.
This can be carried out by two switches, one per relay, inside the device.
Two-position-control ∆s
The activation of the two-position-control is made by a switch inside the device.
Two-position-control with minimum safety
The set limit value A equals the switching value and the limit value B equals the switch back value.
At two-position-control the safety function must be set identically for both output relays.
The relay switches off, if the switching level is transgressed,
or the power supply fails.
The relay switches off, if the switching level is underrun,
or the power supply fails.
Two-position-control with maximum safety
GWA – 250
page 4 of 8
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