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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 107/197
11.6 Zero-voltage relay alarm output
The chamber is equipped with a zero-voltage relay output which permits the transmission
of some alarm messages to a central monitoring system.
The connection is realized as a DIN socket (3) on the chamber rear. A suitable DIN plug
is enclosed.
Figure 29: Pin configuration of the DIN socket (3) on the chamber rear
ALARM
Pin 1: Pole, Pin 2: Break relay, Pin 3: Make contact
In case there is no alarm, contact 1 closes with contact 3.
Closing contact 1 with contact 2 switches the zero-voltage relay alarm output.
Maximum loading capacity of the switching contacts: 24V AC/DC – 2.5A
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 zero-voltage relay alarm output switches at the following events:
Alarm message
Condition
Switching the alarm contact
---
Power failure immediately
“Temperature range”
Temperature tolerance range alarm
(see chap. 11.1.2)
After configurable delay time (chap.
11.5). Factory setting: 10 minutes
“CO2 range”
CO
2
tolerance range alarm
(see chap. 11.1.2)
After configurable delay time (chap.
11.5). Factory setting: 10 minutes
“O2 range”
O
2
tolerance range alarm
(chamber with O
2
control)
(see chap. 11.1.2)
After configurable delay time (chap.
11.5). Factory setting: 10 minutes
CBF / CBF-UL:
“Humidity range”
Humidity tolerance range alarm
(see chap. 11.1.2)
After configurable delay time (chap.
11.5). Factory setting: 10 minutes
“Door open”
Chamber door open alarm
(see chap. 11.1.2)
After configurable delay time (chap.
11.5). Factory setting: 1 minutes
CBF / CBF-UL:
“Humidity system”
The humidity module is defective
(see chap. 11.1.2)
immediately
CBF / CBF-UL:
“Freshwater supply”
The humidity module cannot fill up
(see chap. 11.1.2)
immediately
In case of a tolerance range alarm or a door open alarm, the alarm message on the controller display
remains on during the alarm transmission via the zero-voltage relay outputs.
As soon as the cause of the alarm is identified and resolved, you can reset the alarm transmission via the
zero-voltage relay outputs together with the alarm message in the “Active alarms” menu by pressing the
Reset alarm icon.
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