Danfoss MCD 500 Service Manual

5.2.1 Using the Soft Starter to Switch a Contactor
Before using the soft starter's output relay to switch an electronic contactor coil, consult the contactor manufacturer. Some contactor manufacturers (eg
Klockner-Moeller) state that you cannot use PCB mount relays for direct switching of their electronic contactor coils.
If this is the case, there are two solutions:
1. Use the soft starter's output relay to control a slave relay. This slave relay can then be used to directly switch the electronic contactor coil circuit.
KA1
KA1
KM1
A1
A2
177 H A337.1 1
1
3
2
1. Soft starter output relay
2. Slave relay coil
3. Contactor coil
A2
A10 A1
A11
177HA338.11
1
2
1. Soft starter output relay
2. Contactor coil
5.3 Control Input
MCD 500 soft starters can be operated by external two wire or three wire control signals. External switches are configured and wired into control input
terminals 01, 02.
• External switches operating the control inputs must be rated for the control voltage being used and a continuous current of 100 mA.
• Incorrect configuration and wiring of the external contacts/switches to the control input terminals may cause damage.
• If long cable runs are used, wiring must be twisted pair or shielded cable and must be separated from AC power cables by at least 300 mm.
5 Avoiding Damage MCD 500 Service Manual
36 MG.17.L1.02 - VLT
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is a registered Danfoss trademark
5

Danfoss MCD 500 Specifications

General

Cooling Method	Forced Air
Rated Control Supply Voltage Us	24V DC
Rated Operational Current Ie	Up to 500A
Approvals	CE, UL
Output Current	25 - 1600 A
Protection Class	IP20