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UF V (E3) 10/2020 Page 64/119
14.5 Zero-voltage relay alarm output
Collective alarm output via the zero-voltage relay alarm contact
The freezer is equipped at the rear with a zero-voltage relay output (9), which permits the transmission of
alarms to an external monitoring system in order to monitor and record the alarm signals.
The zero-voltage relay alarm output switches immediately, as soon as the “Collective alarm” icon lights up.
The zero-voltage relay alarm output switches for all alarm instances and in case of a power failure.
If the external alarm monitor is connected via the contacts C and NO, alarm monitoring will take place with
protection against short-circuiting, i.e., if the connection between the freezer and the external alarm monitor
is interrupted, an alarm is triggered. In this case, power failure will also trigger the alarm.
Figure 22: Zero-
voltage contacts circuit diagram
and pin allocation of DIN socket (8)
In case of no alarm, contact C closes with contact NO.
Closing contact C with contact NC switches the zero-voltage relay alarm output.
Maximum loading capacity of the switching contacts: 24V AC/DC – 2.0 Amp.
DANGER
Electrical hazard through overload of switching contacts.
Deadly electric shock, damage to switching contacts and connection socket.
∅ Do NOT exceed the maximum switching load of 24V AC/DC – 2.0 Amp.
∅ Do NOT connect any devices with a higher loading capacity.
The alarm message on the controller display remains displayed during transmission of an alarm via the
zero-voltage relay outputs. As soon as the cause of the alarm is rectified, or the alarm message has been
reset, the alarm transmission via the zero-voltage relay outputs is reset together with the alarm message
on the controller display.
In case of power failure, transmission of the alarm via zero-voltage relay outputs remains active for the
duration of the power failure. Afterwards, the contact closes automatically.
Connection to an external monitoring system
To ensure short-circuit-proof alarm monitoring that will trigger the alarm when the freezer is connected to
an external alarm monitor, connect the external alarm monitoring system to the freezer via the connection
socket (9) of the zero-voltage relay output.
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