FCM II Installation Guide: 20160419 - Part # 2307
2.4 ELECTRICAL SUPPLY CONNECTIONS
FCM IIs require a supply of 19 – 36 Vdc, 100mA to power each module (200mA for a double). The power must
be from an isolated, SELV (Safety Extra Low Voltage) power supply, rated 36 VDC max.
Although the ten position power/communication bus terminal block is rated for solid or stranded copper wire 14 to
30 AWG [2.1 to 0.05 mm
2
], Toptech recommends using stranded 16 to 18 AWG [1.3 to 0.8 mm
2
] for power. See
section 2.5 regarding the choice of communication wire. The required screw tightening torque is 2 to 4 Lb-in. [0.2
to 0.5 Nm]. For terminal assignments, see Figure 2.4 below. Wires must be stripped ¼” and inserted into terminal
block leaving no bare conductor exposed. Only one of each of the three possible 24 VDC+/DC COMMON pairs
need be used; the rest are provided for bus capacity.
24 VDC + 24 VDC +
24 VDC + 24 VDC +
24 VDC + 24 VDC +
DC Common DC Common
DC Common DC Common
DC Common DC Common
RDA RDA
RDB RDB
TDA TDA
TDB TDB
Figure 2.4 Power / Com Connection Bus
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