1
Power Electronics
Softstarter with softstop BA 9026
ministart
All technical data in this list relate to the state at the moment of edition. We reserve the right
for technical improvements and changes at any time.
BA 9026 / 12.11.02 d
Function diagram
Approvals and marking
Applications
• Motor with gear, belt or chain drive
• Fans, pumps, conveyor systems, compressors
• Packaging machines, door-drives
• Start current limiting on 3-phase motors
• Reduces on off current on transformers and P.S.U's
• Increases the life of squirrel cage motors and mechanical drives
• Easily fitted to existing installations
• 3-phase control softstart and softstop
• For motors up to 3 kW
• Start current limited to 2 to 3 times rated motor current
• Semiconductors bridged after softstart
• Adjustable ramp time, starting torque and deceleration time
• LED indication
• DIN rail mounted
• Galvanic isolation of control input and auxiliary power supply
• Integrated overtemperature monitoring
• Wide motor voltage range 200 to 460 V AC
• Width 45 mm
Function
Softstarts are electronic devices designed to enable 1-phase or 3-phase
induction motors to start smoothly. The BA 9026 slowly ramps up the
current on three phases, therefore allowing the motor torque to build up
slowly. This reduces the mechanical stress or the machine and prevents
damage to conveyed material.
When the motor is up to full speed the semiconductors in BA 9026 are
bridged to prevent internal power losses and heat build up to addition
BA 9026 allows a softstop function prolonging the stop time of the motor
preventing high counter torques from abruptly stopping the motor.
Indication
LED green
ON
=
power connected
LED yellow
ON
=
power semiconductors bridged
LED red
ON
=
overtemperature
Block diagram
Notes
Motor load must always be connected as continuous operation of the
softstart with no load may cause overheating of the motor and softstart.
It is recomended that the softstart is protected by superfast semiconductor
fuses rated as per the current rating of the softstart of motor. However,
standard line and motor protection is acceptable, but for high starting
frequencies motor winding temperature monitoring is recommended.
Principle of operation
For direct on line or star delta applications, terminals L1, L2, L3 are
connected to the mains contactor, with the motor connected to terminals
T1, T2, T3. A 24 V DC auxiliary supply is connected to terminals A1, A2
and a 24 V DC control signal connected to terminals X1-X2.
When power is connected to terminals L1, L2, L3 and 24 V DC is present
at terminals X1-X2, the softstart will commence. Potentiometer
"t
an" (0,5-5s) adjustst the ramp time (time motor takes to get to full speed)
and potentiometer "M
an" adjusts the start voltage (50-80 % nomV). When
the softstart is complete the internal semiconductors are automatically
bridged.
When 24 V DC is removed from terminals X1-X2, the softstop function will
commence for the deceleration time period set on potentiometer
"t
ab"
(0,5-5s) and deceleration voltage level set on potentiometer
"M
ab" (30-80 % nomV).
:
:
:
t
t
t0-t1
t2-t3
t0
tt
12
3
L1 / L2 / L3
T1 / T2 / T3
t
0
X1 / X2
M Mot
n
M7038_a
A1 / A2
start
ramp up time
ramp down time
Polish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
