Using The Soft Starter To Switch A Contactor; Control Input - Danfoss MCD500 Service Manual

Avoiding Damage
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:
5 5
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.
1
KA1
2
1. Soft starter output relay
2. Slave relay coil
3. Contactor coil
34
MCD 500 Service Manual
KA1
KM1
A1
3
A2
177HA337.11
®
MG.17.L4.02 - VLT is a registered Danfoss trademark
1
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.
A10 A1
2
A11 A2
177HA338.11