GWA – 250
page 4 of 8
Safety function
The safety function defines the operation principle of the output relays.
Maximum safety:
The relay switches off, if the switching level is transgressed,
or the power supply fails.
Minimum safety:
The relay switches off, if the switching level is underrun,
or the power supply fails.
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
Two-position-control with maximum 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.
