5.8 Installation with Main Contactor
The MCD 500 is installed with a main contactor (AC3 rated). Control voltage must be supplied from the input side of the
contactor.
The main contactor is controlled by the MCD 500 Main Contactor output, which by default is assigned to Output Relay A
(terminals 13, 14).
KM1
KM1
F1
22
21
6/T3
2/T1
13
14
4/T2
24
33
34
06
05
08
07
17
18
25
11
16
A6
A5
A4
5/L3
3/L2
15
S1
S2
E
1/L1
+
+
5
6 7
4
2
A
3
1
177HA522.10
24
VDC
1
Control voltage (model dependent) KM1 Main contactor
24 VDC output F1 Semiconductor fuses (optional)
Remote control inputs S1 Start /stop
Motor thermistor input (PTC only) S2 Reset contact
Relay outputs 13, 14 Relay output A
3-phase supply 21, 22, 24 Relay output B
Motor terminals 33, 34 Relay output C
Par. 4-1 Relay A Function
Select Main Contactor - assigns the Main Contactor function to Relay Output A (default value).
Application Examples MCD 500 Operating Instruction
MG.17.K3.02 - VLT
®
is a registered Danfoss trademark 35
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