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).
17
7
H
A
5
0
4
.1
0
Start/stop
Reset
Start
Stop
Reset
Start
Stop
Reset
15
16
17
18
25
18
15
16
17
18
25
18
15
16
17
18
25
18
2
3
1
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.
4 Electrical Installation
MCD 500 Operating Instruction
12
MG.17.K2.02 - VLT
®
is a registered Danfoss trademark
4