Operating Instructions | symphony 5.3 A – 06/2009
5
Start-up
5
Start-up
32
5.6 Connecting the alarm contact
NOTICE!
Expert work:
VWR warrants the operational safety and the operativeness of
the device only if installation and repairs are performed pro-
perly.
The connection of the device to an external alarm system must
only be carried out by adequately trained and authorized
expert electrical/telecommunication personnel!
Function:
Alarm/monitoring system
When failures occur in the temperature or gas control circuits, an alarm
message is issued to the connected alarm/monitoring system. The poten-
tial-free contacts (1 changeover contact) have been laid out for the follo-
wing circuits:
Alarm relay
NOTE!
Switching structure:
For all failures reported by the device (sensor circuit open,
deviation from the nominal value and door open for more than
10 minutes), the alarm relay changes state!
Circuit
Voltage
External fusing
Circuits with system
voltage
max. 250 V ~
max. 6 A
25 V ~
max. 2 A
60 V =
max. 1 A
50 V ~
max. 1 A
120 V =
max. 0.5 A
SELV circuits (cf.
VDE 0100, Part 410)
SELV-E circuits (cf.
VDE 0100, Part 410)
Operating state
Contact 4 - 1
Contact 4 - 3
No failure, power off
X
O
No failure, power on
O
X
Failure
X
O
X: Contact closed / O: Contact open
