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Motor Brake Relay From DOLD

Motor brake relays are used with view to safety and efficiency. With braking currents up to 600 A DOLD braking units allow a reliable deceleration of asynchronous motors up to 160 kW. They can be used to bring your machines to a standstill within 10 s as required by the European Directive on Machinery.

Advantages

... at a glance

  • Easy installation, also in existing plants
  • Free from wear and maintenance
  • Adjustable braking currents allow optimal tailoring to machines and plants
  • Automatic zero-speed monitoring ensures precisely accurate braking current cutoff and spares time-consuming readjustments
  • Thermistor motor protection prevents inacceptable motor heating
  • Wide voltage ranges allow a versatile use of the braking units

Technology

What is DC Injection Braking?

DC Injection braking is an effective electrical method of stopping a rotating AC asynchronous motor.

How does it work ?

An AC electrical motor works on the basic principle of opposing magnetic poles attracting each other. If you create a rotating magnetic field in the stationary (stator) windings of a motor, a magnetic field of the opposite polarity in the rotating (rotor) windings will naturally want to follow it trying to align itself (Fig.1).

Fig.1 The ‘Rotor’ will follow the rotating magnetic field in the ‘Stator’ windings.

If you were to then create a stationary magnetic field in the stator, the attracted opposing fields in the still rotating rotor windings will try to align themselves with the stationary field, creating a strong braking force. This is what happens when a DC current is Injected into the ‘Stator’ windings of a motor.

Applications

  • Wood working machines
  • Centrifuges, belt conveyor drives
  • Textile machines
  • Mills, grinding machines
  • Materials handling
Motor brake relay MINISTOP
Function
Braking current
adjustable up to
[A] max.
Braking time
adjustable
up to [s] max.
Automatic
zero-speed
monitoring
Temperature
monitoring
External brake
contactor
required
Diverse
signalling
outputs
Width
[mm]
Type
Motor brake relay
60
30
+
+
+
90
Motor brake relay
25
11
+
45
Motor brake relay
80
20
+
+
90
Motor brake relay
25
15
+
optionally
+
100
Motor brake relay
600
320
+
optionally
from 100 A
+
110
Softstart with d.c. brak
60
30
+
+
90
Softstart with d.c. brak
standstill detection
60
30
+
+
+
112
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