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CB-S / CB-S-UL (E7) 06/2020 page 64/119
15.5 Zero-voltage relay alarm output
Collective alarm output via the zero-voltage relay alarm contact
The chamber is equipped at the rear with a zero-voltage relay output (13) for temperature and CO
2
, which
permits the transmission of alarms to an external monitoring system in order to monitor and record the
alarm signals. A DIN socket (13) serves to establish this connection.
The zero-voltage relay alarm output switches for all alarm instances and in case of a power failure.
Depending on the alarm cause, the state of alarm is triggered immediately or after an adjustable time
(chap. 15.1). With the state of alarm, the “collective alarm” icon flashes on the controller display, a text
message indicates the alarm cause, and the buzzer sounds if the acoustic alarm has been activated. The
zero-voltage relay alarm contact switches without any delay.
ALARME
C = Pin 1 (Pole)
NC = Pin 2 (Break relay)
NO = Pin 3 (Make contact)
Figure 15: Zero-voltage contacts circuit diagram and pin allocation of DIN socket (13)
In case of no alarm, contact 1 (C) closes with contact 3 (NO).
Closing contact 1 (C) with contact 2 (NC) switches the zero-voltage relay alarm output
Maximum loading capacity of the switching contacts: 24V AC/DC – 2.5 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 – 2.5A.
∅ 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 alarm output. 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. When power supply returns, contact 1 (C) closes automatically with contact
3 (NO).
Connection to an external monitoring system
To ensure short-circuit-proof alarm monitoring that will trigger the alarm when the chamber connection to
an external alarm monitor is interrupted, connect the external alarm monitoring system to the chamber via
the contacts 1 (C) and 3 (NO). In this case, power failure will also trigger the alarm.
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