User manual

76
Version 2.4 (10/2011) en
Original instructions
Drum Motor
Options and accessories
Electromagnetic holding brake for D-series
The optionally implemented electromagnetic holding brake acts directly on the
rotor shaft. Should the power supply be interrupted, the brake will close and hold
the drum in position until the power supply is reinstated. The brake will hold a
load according to the maximum stated belt pull for the drum motor.
Characteristics:
• Directly applied to the Drum Motor's rotor shaft
• For holding a load according to the stated belt pull
• Suitable for inclined and declined conveyors
• Operated by an external rectifier
• Operating temperature range from -10 °C to +120 °C
Braking delay time is depending on switching at input (AC switching) or at
output (DC switching) of the rectifier. DC switching is much faster but produces
high voltage peaks (500 to 1200 V).
Opening delay time can be shortened by using fast acting or phase rectifiers,
which are available on request. Double over excitation voltage to open the brake
shortens the opening delay time by half.
The built in brake disc is a wear part and has a limited lifetime depending on the
operational conditions. In case of premature wear the operation conditions have
to be checked and evaluated. Product warranty does not include wear parts of
the brake.
Hint
• Combination of Brake and Encoder is not possible.
• The nominal brake torque is strongly influenced by the operation conditions
within a drum motor and the ambient temperature. For security, the given
brake torque should be reduced by 50 % for load calculations.
Brake type Rated brake
torque
Nm
Rated power
W
Rated supply
voltage
V DC
Rated current
mA
24 1.5 to 2.8 12 24 500
205 2.1 to 6.0 12 205 52
1 205 V Brake 2 24 V Brake
230 V AC
N L
205 VDC
230 VAC
N L
24 VDC
24 VAC