SCS Series Manual —
P/N 15712:L 7/18/16
125
Dedicated Smoke Control System Wiring Diagrams
Ratings and Wiring Diagrams
Figure 5.16 EP Damper Control, Dedicated System - FSCS Switch Group Type 6
Figure 5.16 depicts an EP damper in a dedicated system with the capability of
OPEN
control and verification of the
OPEN
and
CLOSED
state,
switch group type 6. In the above configuration, the CON
ON⁄OP
CM is activated. The CON
ON⁄OP
CM controls a normally closed contactor for
the pressure switch power. When the CON
ON⁄OP
CM is activated, the normally closed contactor is opened, thus cutting power from the pres-
sure switch and causing the damper to open. When the damper completely opens, the open position limit switch is closed, indicating that the
damper is in the
OPEN
position. (When the damper is in the closed position, the closed position limit switch is
CLOSED
.) The VER
ON⁄OP
MM
monitors when the open position limit switch is
CLOSED
. In this case the VER
ON⁄OP
MM is activated and the VER
OFF⁄CL
MM is deactivated
because the damper is
OPEN
.
In a dedicated system, a damper would never need both
ON
and
OFF
control. A damper for a dedicated system is either normally open and
would need to be closed or normally closed and would need to be opened. This is not true for a Non-dedicated system.
Switch group type 7 would never be needed unless redundancy in
OFF
and
ON
control were necessary. Type 7 is used for
ON
and
OFF
control
and verification of the
OFF
state. When the CON
ON⁄OP
CM is deactivated, the CON
OFF⁄CL
CM is activated, and vice versa. The CON
ON⁄OP
CM
controls a normally closed contactor which switches power to the pressure switch. The CON
OFF⁄CL
CM controls a normally open contactor
which switches power to the pressure switch. When the CON
ON⁄OP
CM is deactivated, the contactor is closed, thus supplying power to the
pressure switch. When the CON
OFF⁄CL
CM is activated, the contactor is closed, thus supplying power to the pressure switch. Both control
modules are not necessary to supply or cut the power to the damper: one is sufficient.
Airflow
PRESSURE
SWITCH
SMOKE
DAMPER
OPEN
1b listed
contactor
Power
Source
Listed
24 VDC
Power Source
SLC Loop
FCM-1
CON
ON/OP
CM
(activated)
D
e
p-
df6
a
-f
s-
2.
wm
f
Power
Return
FMM-1
VER
OFF⁄CL
MM
(deactivated)
FMM-1
N/O
COM
Limit Switch
for closed
position
ELR-47K
(use 3.9K listed ELR with FZM-1)
Pneumatic
Tubing
N/O
COM
Limit Switch
for open
position
VER
ON⁄OP
MM
(activated)
*If the SLC device
does not match the
one in this figure,
refer to the SLC
manual appendix,
which contains
wiring conversion
charts for type V
and type H
modules.