Saf OPAL Pro MS6 User Manual download pdf (Page 23)

MS6 REDUCED VOLTAGE STARTER

Page 22

7.7 DC INJECTION BRAKING

• DC injection braking provides smooth braking for AC induction motors.

• DC injection offers adjustable braking because it is current controlled.

• Unlike a mechanical brake, an electrical brake will never wear out.

• The brake operates by injecting DC current in two phases of the motor to rapidly decelerate

it to zero speed.

• When stop is commanded the Opal Pro shuts off for 2 seconds to allow the voltage across

the motor to drop. The DC injection current is then applied at a level set in parameter 1104

for the amount of time set in parameter 1105. It does not provide zero speed sensing,

although if two wire control is used terminal 4 can be used to disable the DC injection

(activated = enabled).

• If braking is released before the motor stops, the motor will coast to rest. If the braking

remains on after the motor stops, the DC supply will provide a holding brake.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 37 38

No comments

Saf OPAL Pro MS6 User Manual Page 23