Group 21: Start/Stop - ABB ACS 400 User Manual

Group 21: Start/Stop

ACS 400 supports several start and stop modes, including flying start and torque boosting at start.
DC current can be injected either before the start command (premagnetising) or automatically right
after the start command (starting with DC hold).
DC hold can be used when stopping the drive with ramp. If drive is stopping by coasting, DC brake
can be used.
Note! Too long a DC injection time or premagn max time causes the motor to heat up.
Code Description
2101 START FUNCTION
Conditions during motor acceleration.
1 =
RAMP
Ramp acceleration as set.
2 =
FLYING
Flying start. Use this setting if the motor is already rotating and the drive will start smoothly at the current
frequency. The drive will automatically search the correct output frequency.
3 =
TORQUE BOOST
Automatic torque boost might be necessary in drives with high starting torque. Torque boost is only applied
at start. Boosting is stopped when output frequency exceeds 20 Hz or when output frequency is equal to
reference. See also parameter 2103
4 = +
FLY BOOST
Activates both the flying start and torque boost.
Note! If torque boost is used the switching frequency is always 4 kHz. In this case parameter 2605
is ignored.
NOISE
2102 STOP FUNCTION
Conditions during motor deceleration.
1 =
COAST
Motor coasts to stop.
2 =
RAMP
Ramp deceleration as defined by the active deceleration time 2203
2103 TORQ BOOST CURR
Maximum supplied current during torque boost. See also parameter 2101
2104 STOP DC INJ TIME
DC injection time after modulation has stopped. If 2102
braking. If 2102
2105 PREMAGN SEL
Options 1- 5 select source for premagnetising command. Option 6 selects start with DC hold.
0 =
NOT SEL
Premagnetising not used.
1...5 = DI1...DI5
Premagnetising command is received through a digital input.
6 =
CONST
Constant premagnetising time after start command. Time is defined by parameter 2106
2106 PREMAGN MAX TIME
Maximum premagnetising time.
80
TORQ BOOST CURR
is 2 (
STOP FUNCTION RAMP
.
STOP FUNCTION
), ACS 400 uses DC hold after ramp.
1 or 2205
DECELER TIME
.
START FUNCTION
is 1 ( ), ACS 400 uses DC
COAST
PREMAGN MAX TIME
ACS 400 User's Manual
LOW
2.
DECELER TIME
.