TYPE 4208 “T”
TIME LIMIT CUTOUT MODULE
INTRODUCTION
The “T” module is used as a timer for the alarm minutes by a knob on top of the relay.
signaling devices. It allows the alarm signaling de-
The “T” module can be mounted on its own
vices to be sounded for a specific duration. The
back plate or on vacant space in one of the signal
signal duration can be adjusted for two to eight panels.
CIRCUIT OPERATION (FIG. 23)
The “T” module is activated by an “alarm” sig-
nal (-24VDC) from an “A”, “B” or “AX” panel.
The “alarm” signal enters the “T” module at ter-
minal 2 and it is applied via contacts K4A (l&4) to
the signaling devices (sounding the devices).
The signaling devices sound for the preset dura-
tion (two to eight minutes) and then relay K4 ener-
gizes and its contacts transfer.
When the K4A contacts transfer, the “alarm”
signal is removed from the signaling devices and
they stop sounding.
When the K4B contacts transfer, -24VDC is ap-
plied through contacts K4B (8&6) to terminal 5 in
the “A” or “AX” panel. This -24VDC on terminal
5 causes a “trouble” condition in the “A” or “AX”
panel.
NOTE: The K4A contacts are no longer used for
“A” or “AX” panel “trouble” indication, al-
though this type operation may still exist in
some older systems. Contacts K4B are used to
activate the “trouble” circuitry as explained
above.
ALARM IN)
+
K4A
&
-TO SIGNALING
DEVICES
6
+ -
;r TO TERM 5
-24VDC
K4B
“A” OR “AX” PANEL
Figure 23
43
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