Two-Speed Motor - Danfoss vlt soft starter mcd 500 Operating Manual

Product Features
- Set braking performance characteristics using the secondary motor settings (parameter group 7 Secondary
Motor Set).
•
Parameter 4-7 Relay C Function.
- Select Trip - assigns trip function to output relay C.
NOTICE
If the soft starter trips on supply frequency (parameter 16-5 Frequency) when the braking contactor K2 opens, modify
the setting of parameters 2-8 to 2-10.

5.14 Two-speed Motor

®
The VLT Soft Starter MCD 500 can be configured for control of 2-speed Dahlander type motors, using a high-speed
contactor (K1), low-speed contactor (K2), and a star contactor (K3).
NOTICE
Pole amplitude modulated (PAM) motors alter the speed by effectively changing the stator frequency using external
winding configuration. Soft starters are not suitable for use with this type of 2-speed motor.
When the soft starter receives a high-speed start signal, it closes the high-speed contactor (K1) and star contactor (K3). Then
it controls the motor according to the primary motor settings (parameters 1-1 to 1-16).
When the soft starter receives a low-speed start signal, it closes the low-speed contactor (K2). This action closes input A and
the soft starter controls the motor according to the secondary motor settings (parameters 7-1 to 7-16).
NOTICE
If the soft starter trips on supply frequency (16-5 Frequency) when the high-speed start signal (7) is removed, modify the
setting of parameters 2-8 to 2-10.
MG17K602
Operating Guide
Danfoss A/S © 05/2016 All rights reserved.
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