iSMA-B-FCU Hardware User Manual
www.ismacontrolli.com
DMP242en | 1st Issue rev. 3 | 02/2022
page 25 of 53
Figure 21. Example of an electrical heater connection
O5 CLG Relay
The iSMA-B-FCU device is equipped with a relay output, which in the FCU application is
dedicated to an external cooler. This relay output is internally connected to the power
supply, therefore there is no need to connect external supply. In iSMA-B-FCU-HH and
iSMA-B-FCU-HL the output voltage in high state is 230 V AC, and in iSMA-B-FCU-LL version
the high state voltage is 24 V AC. Current consumption cannot exceed 6 A. An exemplary
way of connecting is presented in the figure below.
Figure 22. O5 digital output, example of 230 V AC electrical cooler connection (iSMA-B-FCU-HH, iSMA-B-FCU-HL)
WARNING!
Output O4 and outputs O1-O3 are protected by a 6 A fuse. Total current
for digital relay outputs cannot exceed 6A.
WARNING!
It is forbidden to use a fuse with current exceeding 6A! Higher current may
permanently damage the device and cause a danger to the user and to the
equipment!
