SCS Series Manual — P/N 15712:L 7/18/16 109
Dedicated Smoke Control System Wiring Diagrams Ratings and Wiring Diagrams
Figure 5.2 Fan Control, Dedicated System - FSCS Switch Group Type 2
Figure 5.2 depicts a fan in a dedicated system with the capability of
OFF control and verification of the ON state, switch group type 2. In the
above configuration, the CON
OFF⁄CL
CM is deactivated. The CON
OFF⁄CL
CM controls a normally closed contact which switches power to the
fan (the contact is used when the power being switched is greater than 24 volts). When the CON
OFF⁄CL
CM is deactivated, the contact is
closed, thus supplying power to the fan. When power is supplied to the fan, the fan is ON and the sail switch is OPEN, indicating airflow in the
duct. The VER
ON⁄OP
MM monitors the OPEN position of the sail switch, which would indicate when the fan is ON. In this case the
VER
ON⁄OP
MM is activated because the fan is ON and the sail switch is OPEN.
Switch group type 3 is for a fan that would require the capability of
OFF control and verification of both the ON and OFF states. Since it is pos-
sible to determine this information from either switch group type 1 or switch group type 2, switch group type 3 would only be necessary for
redundancy in verifying the state of the fan. For example, if switch group type 1 is used instead of switch group type 3, the
OFF state of the
fan would be verified when the monitor module is activated and the ON state of the fan would be verified when the monitor module is deac-
tivated. Utilizing switch group types 1 or 2 also saves the use of an additional monitor module. Switch group type 3 would use two monitor
modules to provide the same verification as types 1 or 2.
Power Source
1b listed
contactor
Service
Disconnect
Switch
ELR-47K
(use 3.9K listed ELR with FZM-1)
Listed
Sail
Switch
N/O
COM
N/C
Power Return
Listed
24 VDC
Power
Source
FMM-1
FCM-1
CON
OFF/CL
CM
(deactivated)
FAN-Df2-fs-2.wmf
SLC Loop
FAN ON
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.
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