iSMA-B-FCU /FCU Hardware
Version 1.1
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2.2 Power supply connection
iSMA-B-FCU-HH and iSMA-B-FCU-HL are designed to work with 230 V AC power supply. Each ISMA-
B-FCU device is equipped with a built-in 6 A fuse protecting the controller and connected 230
V
AC
equipment.
Figure 5
230 V AC Power supply connection
iSMA-B-FCU-LL is designed to work with 24 V AC power supply. The device is equipped with a built-
in 6
A fuse protecting the controller and connected 24 V AC equipment.
Figure 6 24 V AC Power supply connection
Note: Total current for digital relay outputs O1-O4 cannot exceed 6A.
Note: It is forbidden to use a fuse with current exceeding 6 A! Higher current may permanently
damage the device and cause danger to the user and to the equipment!
2.2.1. 24 V AC power supply for external equipment
iSMA-B-FCU-HH is equipped with a 24 V AC, 7 VA power supply output to supply an external
equipment like sensors and actuators. This power supply uses a separate coil in the transformer.
24 V AC power supply terminal connection is labeled L2, N2.
iSMA-B-FCU-HL is equipped with a 24 V AC power supply output for thermal valves controlled by
Triac Outputs and external devices like sensors and actuators. This power supply uses a separate
coil in the transformer. 24 V AC power supply terminal connection is labeled L2, N2. The total power
