35
VersiStart i III
Speed
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
048
3
5
C
1
2
3
4
Adaptive Stop Profile (parameter 2K):
1. Early Deceleration
2. Constant Deceleration
3. Late Deceleration
4. Stop Time (parameter 2I)
Time
Pump stopping
The hydraulic characteristics of pump systems vary considerably. This variation means the ideal deceleration profile and stop time will
vary from application to application. The table provides guidelines on selecting between Adaptive Control deceleration profiles, but we
recommend testing the three profiles to identify the best profile for the application.
Adaptive Stop Profile
Application
Late Deceleration
High head systems where even a small decrease in motor/pump speed results in a rapid
transition between forward flow and reverse flow.
Constant Deceleration
Low to medium head, high flow applications where the fluid has high momentum.
Early Deceleration
Open pump systems where fluid must drain back through the pump without driving the pump in
reverse.
The first Adaptive Control stop will be a normal soft stop. This allows the VersiStart i III to learn the characteristics of the connected
motor. This motor data is used by the VersiStart i III during subsequent Adaptive Control stops.
NOTE
Adaptive Control will control the load according to the programmed profile. Stopping current will vary according to the
selected deceleration profile and stop time.
If replacing a motor connected to a VersiStart i III programmed for Adaptive Control starting or stopping, or if the starter has
been tested on a different motor prior to actual installation, the starter will need to learn the characteristics of the new
motor. The VersiStart i III will automatically re-learn the motor's characteristics if parameter 1A Motor Full Load Current or
parameter 2L Adaptive Control Gain is changed.
8.6.4
Brake
Brake reduces the time required to stop the motor.
During braking an increased noise level from the motor may be audible. This is a normal part of motor braking.
When brake is selected, the VersiStart i III uses DC injection to slow the motor.
VersiStart i III braking:
x
Does not require the use of a DC brake contactor
x
Controls all three phases so that the braking currents and associated heating are evenly distributed through the motor.
CAUTION
If the brake torque is set too high, the motor will stop before the end of the brake time and the motor will suffer unnecessary
heating which could result in damage. Careful configuration is required to ensure safe operation of the starter and motor.
A high brake torque setting can result in peak currents up to motor DOL being drawn while the motor is stopping. Ensure
protection fuses installed in the motor branch circuit are selected appropriately.
CAUTION
Brake operation causes the motor to heat faster than the rate calculated by the motor thermal model. If you are using
brake, install a motor thermistor or allow sufficient restart delay (parameter 5A).
