SMS SenTRI ONE - Master Alarm Circuits; Common Fault Contacts

Master alarm circuits
There are two MASTER ALARM circuits that can accept the
connection of conventional alarm sounders including the
conventional Sounder-Strobe products.
Common Fault contacts
The control panel has a COMMON FAULT relay having voltage
free contacts that can be used to signal external equipment. The
relay is normally energised and will de-energise on occurrence of
a fault event. The relay contacts return to their normal state when
the panel has no fault present. The contacts should be powered
from an independent power supply, where required.
21
SenTRI ONE System
MA1
FS2 250mA
MA2
FS3 250mA
MAIN CONTROL BOARD
PANEL
10K
O
hms -
End-of-line resistor
fitted in the last alarm sounder
Conventional
alarm sounders
MA1+ MA1- MA2+ MA2-
If master alarms are not being used then connect
the 10K ohms End-of-line resistors to the master
alarm terminals.
DRNDRN
MASTER
ALARM 1
PP6
MA1+ MA2+ MA2- DRN
MASTER
ALARM 2
PP7
MA1- DRN
MAIN CONTROL BOARD
PANEL
MASTER
ALARM 1
MASTER
ALARM 2
PP6
PP7
PANEL
MAIN CONTROL BOARD
The fault relay is shown in its normal
state with panel powered up and
with no active fault.
FAULT RELAY
C
hange over contacts rated
1A @ 24Vdc to control external equipment
NC CNO
DRN
COMMON FAULT
PP4