Brake Selection
General
The Solbrake / SMB - Solid State Motor Brake provides
fast, smooth, frictionless braking of three-phase
squirrel-cage motors by injecting controlled DC current to
the motor windings, after Mains contactor opened. This
induces a stationary magnetic field, which exerts a braking
torque on the rotor.
Stopping time can be similar to the time it takes to reach
full speed on a Direct-On-Line starting.
Adjustable Braking Torque and Braking Time enable
perfect matching of the brake to the driven load.
Automatic sensing System turns the brake off
automatically when the motor comes to a full stop. This
minimizes the motor heating.
Brakes ratings and Frame sizes
Max Motor
FLA (Amp)
Brake Type
FLC
Frame
Size
Case
material
10 Solbrake 10 SB0
PC/ABS
17 Solbrake 17
31 Solbrake 31
58 Solbrake 58
SB1
Aluminum
105 Solbrake 105
170 Solbrake 170
210 Solbrake 210
SB2
310 Solbrake 310
390 Solbrake 390
SB3
Metal
Dimensions (mm)
Size Width Height Depth
SB0 45 75 105
SB1 65 190 114
SB2 154 280 160
SB3 224 384 222
Select the brake according to the following criteria:
M
otor Current & starting conditions
• Motor's Full Load Ampere (FLA) - as indicated
on its nameplate (even if the motor is not fully
loaded).
• The Solbrake (SMB) is designed for a duty cycle
f 10% or less; e.g. 10 sec. operation, 90 sec. rest. o
Duty Cycle - the ratio between operating time
and
total cycle time (rest time + Braking time).
Braking time
Duty Cycle = ------------------------------- x 100 (%)
Rest time + Braking time
Note:
If a higher duty cycle is required select a higher Solbrake
(SMB) type to allow enough brake time current.
Centrifuge
RPM
Stopping Time
t
SMB
Wood Saw
Mains Voltage (line to line)
Thyristor's PIV rating, internal circuitry and insulation
determines six voltage levels: Each brake is factory set
for one of the following levels according to the Ordering
Information.
Voltage Tolerance
220- 240 V +10 -15 %
380 - 415 V +10 -15 %
440 V +10 -15 %
460 - 500 V +10 -15 %
575 - 600 V +10 -15 %
690 V (210A-390A) +10 -15 %
Each brake is factory set
for one of the above levels and
suitable for 50 or for 60 Hz (± 5%).
Options
(see Ordering Information)
For extended braking time - consult factory and provide the
following information:
• Ambient temperature.
• Actual stopping current.
• Actual stopping time.
• Time interval between starts
• Load characteristics
3
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