SCS Series Manual — P/N 15712:L 7/18/16 127
Non-dedicated Smoke Control System Wiring Diagrams Ratings and Wiring Diagrams
Figure 5.18 Fan Control, Non-dedicated System - FSCS Switch Group Type 2
Figure 5.18 depicts a fan in a non-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 contactor which switches power
to the fan (the contactor is used when the power being switched is greater than 24 volts). When the CON
OFF⁄CL
CM is deactivated, the con-
tactor is closed, thus allowing the EMS to freely control the fan. In this case the EMS is OFF, so no power is being supplied to the fan. When
no power is supplied to the fan, the fan is
OFF and the sail switch is CLOSED, indicating no 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 deactivated because the fan
is OFF due to the EMS. When the CON
OFF⁄CL
CM is activated, the normally closed contactor opens, thus cutting any power to the fan that
was being supplied by the EMS.
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
FCM-1
CON
OFF/CL
CM
(deactivated)
VER
ON/OP
MM
(deactivated)
fan-nf2-fs-2.wmf
SLC Loop
FAN OFF
Listed contactor
for Energy
Management
System
Energy Management System
Listed
24 VDC
Power Source
FMM-1
*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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