Remote Arm/Disarm Connection, Terminals 38-39 (TB17)
The control panel can be armed and disarmed remotely by using a PLC or switch wired
to these terminals. Wired in series with the key-switch on the front panel, terminals 38
and 39 signal the panel to arm when closed and to disarm when opened if the key-
switch on the front panel is in the ARM position. If remote arming/disarming is not used,
a jumper must be installed across terminals 38 and 39. Otherwise, the control panel will
not arm. Remote arming/disarming is impossible if the key-switch on the front panel is in
the DISARM position.
Resistor Bypass, Terminals 40-41 (TB18)
An internal 4
Ω
resistor is provided in the control panel to increase resistance on the
actuator circuit (also referred to as the electro-explosive device circuit or EED circuit) so
as not to overload the circuit. If the field resistance of the EED wiring is greater than 5
Ω
,
install a jumper across terminals 40 and 41 otherwise do not install a jumper.
Interlock Connection, Terminals 42-43 (TB19)
If the protected equipment is equipped with an access door with a limit switch, the switch
can be connected to terminals 42 and 43 such that the door needs to be closed to arm
the system. Furthermore, if the door is opened during operation, the control panel will
shutdown the process provided that the process is properly interlocked using the trouble
relay contacts. If the interlock connection terminals are not used, a jumper across
terminals 42 and 43 is required. Otherwise, the control panel will not arm.
THIS INTERLOCK CIRCUIT DOES NOT PREVENT THE
FIREWOLF™ HRD EXTINGUISHERS FROM OPERATING.
!
!
WARNING
IF FIREWOLF™ HRD EXTINGUISHERS ARE USED, USE THE
REMOTE ARM/DISARM TERMINALS IN LIEU OF
THE INTERLOCK TERMINALS
EED Connection, Terminals 44-45 (TB20)
The electro-explosive devices or actuators used to initiate the system’s HRD
extinguishers are wired in series to these terminals. The maximum field resistance
allowed on this circuit is 20
Ω
. This will accommodate up to twelve (12) extinguishers
when using 12 AWG wire. Refer to the specific system drawings for wiring of this circuit.
!
!
WARNING
USE A DIGITAL MULTIMETER WITH AN OUTPUT TEST CURRENT
OF LESS THAN 50 ma TO MEASURE FIELD WIRING RESISTANCE.
USING A HIGHER CURRENT MAY DETONATE THE INITIATORS.
Battery Connection, Terminals 47-48 (TB12)
The 12V-12Ah or the 12V-35Ah battery shipped with the control panel is wired to these
terminals. Wires are connected to these terminals in the factory. The red wire is to be
connected to the ‘+’ battery terminal and the black wire to the ‘-‘ battery terminal. Refer
to the
Battery Installation
section of this manual for more information.
FENWAL
Protection Systems
FSS/MC-519 Rev BC
Page 15
