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SLC-220 User Guide Rev 2.0 June 2018
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2.2.1 Connecting the Power Cable
Make sure that there is no power connected to the cable. Pass the cable through the electrical
conduit that goes from the power source to the SLC-220. Pass the cable through the input gland
on the bottom side of the enclosure.
For 100 - 240 VAC:
Connect the cable to the power-supply terminal block inside the enclosure as follows:
Power Line Contact of Power Supply
Terminal Block
AC PHASE 1 (L)
AC NULL 2 (N)
FRAME GROUND 3 (FG)
NOTE:
Use wires of minimum 18AWG, specified to at least 90°C and 300V.
An external switch or circuit breaker (5 Amp) must be installed on the power input line
of SLC-220. This switch, located near SLC-220, must disconnect both poles of the
supply voltage. It should be rated appropriately and must be marked as the
disconnecting device for SLC-220.
For 12 or 24 VDC:
Connect the cable to the power-supply terminal block inside the enclosure as follows:
Power Line Contact of Power Supply
Terminal Block
+12 or + 24 V 1 (+)
12 V or 24 V RETURN 2 (-)
FRAME GROUND 3 (FG)
Power consumption is 24 Watts maximum.
Note:
1. A Power On-Off switch is installed near the Power Supply terminal block for easier
maintenance when power should be turned off before making wiring changes.
The switch disconnects the 12VDC supply to the boards, not the Mains power!
2. When the SLC-220 is powered up, it goes through a self-test procedure of a few seconds
which turns on all status lights. Only then the sensors are sampled normally and the lights,
relays and 4-20mA outputs are updated to real values.
NOTE for SLC-220/Multi:
If one or more Outputs Boards are provided, they are installed on a separate metallic
mounting plate above the Main board. The mounting plate can be easily removed since
it is fastened by four quick-disconnect nylon studs, giving access to the Main board.
The nylon suds should be used gently to avoid break!