VersiStart i III
36
To configure the VersiStart i III for brake operation:
1.
Set parameter 2I for the desired stopping time duration (1). This is the total braking time and must be set sufficiently longer than
the brake time (parameter 15H) to allow the pre-braking stage to reduce motor speed to approximately 70%. If the stop time is too
short, braking will not be successful and the motor will coast to stop.
2.
Set Brake Time (parameter 15H) to approximately one quarter of the programmed Stop Time. This sets the time for the Full Brake
stage (2).
3.
Adjust the Brake Torque (parameter 15G) so that the desired stopping performance is achieved. If set too low, the motor will not
stop completely and will coast to stop by the end of the braking period.
Speed
100%
75%
0%
50%
25%
1
2
3
1: Stop Time (parameter 2I)
2: Brake Time (parameter 15H)
3: Coast to stop time
Time
CAUTION
When using DC brake, the mains supply must be connected to the soft starter (input terminals L1, L2, L3) in positive phase
sequence and parameter 4B Phase Sequence must be set to Positive Only.
NOTE
For loads which may vary between braking cycles, install a zero speed sensor to ensure that the soft starter ends DC
braking when the motor stops. This avoids unnecessary heating of the motor.
For more information on using the VersiStart i III with an external speed sensor (eg for applications with variable load during
the braking cycle), refer to DC Brake with External Zero Speed Sensor on page 62.
8.7
Jog Operation
Jog runs the motor at reduced speed, to allow alignment of the load or to assist servicing. The motor can be jogged in either forward or
reverse direction.
The maximum available torque for jog forward is approximately 50%~75% of motor full load torque (FLT) depending on the motor. The
torque when the motor is jogged in reverse is approximately 25% to 50% of FLT.
Parameter 15F Jog Torque controls how much of the maximum available jog torque the soft starter will apply to the motor.
NOTE
Torque settings above 50% may cause increased shaft vibration.
Av
ai
labl
e tor
que
0%
100%
90%
80%
20%
40%
10%
30%
50%
60%
70%
05723.D
1. Motor FLT
2. Jog forward maximum torque
3. Jog reverse maximum torque
To activate jog operation, use a programmable input (refer to parameter 6D for details). If any other command is received when jogging
the starter will stop and await a new command.
NOTE
Soft start and soft stop are not available during jog operation.
Jog is only available for the primary motor.
CAUTION
Slow speed running is not intended for continuous operation due to reduced motor cooling.
Jog operation causes the motor to heat faster than the rate calculated by the motor thermal model. If you are using jog,
install a motor thermistor or allow sufficient restart delay (parameter 5A).