Remote Inputs; Serial Communication; Earth Terminal; Power Terminations - Danfoss mcd-500 Operating Instruction

4 Electrical Installation

4.1.3 Remote Inputs

The MCD 500 has three fixed inputs for remote control. These inputs should be controlled by contacts rated for low voltage, low current operation (gold
flash or similar).
4
1 Two-wire control
2 Three-wire control
3 Four-wire control
The reset input can be normally open or normally closed. Use par. 3-8 to select the configuration.
Do not apply voltage to the control input terminals. These are active 24 VDC inputs and must be controlled with potential free contacts.
Cables to the control inputs must be segregated from mains voltage and motor cabling

4.1.4 Serial Communication

Serial communication is always enabled in local control mode, and can be enabled or disabled in remote control mode (see par. 3-2).

4.1.5 Earth Terminal

Earth terminals are located at the back of the soft starter.
• MCD5-0021B - MCD5-0105B have one terminal, on the input side.
• MCD5-0131B - MCD5-1600C have two terminals, one on the input side and one on the output side.

4.1.6 Power Terminations

Use only copper stranded or solid conductors, rated for 75° C.
NB!
Some units are aluminium bus bars. When connecting power terminations, we recommend cleaning the surface contact area thoroughly
(using an emery or stainless steel brush) and using an appropriate jointing compound to prevent corrosion.
12
1
15
Start
16
17 Stop
Start/stop
18
25
Reset
Reset
18
MG.17.K2.02 - VLT
2 3
15 15
Start
16 16
17 17
Stop
18 18
25 25
Reset
18 18
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MCD 500 Operating Instruction