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3
Table of Contents
Page
1
WIRING CONFIGURATION ........................................................................................................................... 3
2
FAULT INDICATION ...................................................................................................................................... 4
1 Wiring Configuration
The diagram below
shows a ‘typical’ application for the 4A sounder booster. Note that a 10KΩ EOL resistor
must be fitted to the end of the boosted sounder output circuit to maintain correct fault monitoring.
Mxp-026 Wiring Configuration.
Note. PSU ‘
Failsafe’
Operation
The EN54
PSU shall be fitted with a ‘Fault’ relay that is energised during normal operation and de-energised for
any fault condition. The ‘FAULT I/P’ connections on the sounder booster card should be connected to the ‘COM’
and ‘N/O’ connections of the PSU as shown above. The table below indicates the state of the relay for all
conditions.
PSU ‘ON’ without Fault
(Energised)
PSU ‘ON’ with Fault
(De-energised)
PSU ‘OFF’
(De-energised)
Relay Contacts
Com – N/O
Closed
Open
Open
Relay Contacts
Com – N/C
Open
Closed
Closed
From the panel
sounder output
circuit.
10K EOL resistor
must be fitted to the
end of the boosted
output circuit for
correct fault
monitoring.
_
+
V
o
–
V
o +
B
A
T +
BAT
–
N/
C
N/
O
CO
M
5A EN54 PSU
(-BXP)
4A Boosted O/P
_
+
