TYPE 4208 “U”
ADAPTER RELAY MODULE
INTRODUCTION
The “U” module provides a holding circuit for
vices. The “U” module latches at the first alarm
the “D”,
“E” and ‘5” panels when these panels are
pulse and applies a steady alarm signal (-24VDC) to
used in a system with coded alarm-initiating de-
the “D”, “E” or “S” panels.
CIRCUIT OPERATION (FIG. 24)
The coded alarm signal from terminal 7 of the
“A”,
“B” or “AX” panel is applied to the “U”
module terminal 5. Current flows from terminal 5,
through the K4B contacts, terminal 8,diode D3,
terminal 7, relay K4 (energizing K4), to +24VDC
at terminal 2.
Relay K4 energizes at the first coded pulse and
its contacts transfer. Current flows from terminal
6 (-24VDC), through terminal 8, diode D3, termi-
nal 7, relay K4 (latching relay K4) to +24VDC at
terminal 2. Current also flows from terminal 6,
through terminal 3, terminal 1 to the “D”, “E” or
“S” panels.
Dl
u
-
D2
TO D,EorSq
PANELS
Figure 24
44
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