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Group 21: Start/Stop
ACS 140 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.
Code Description
2101 START FUNCTION
Conditions during motor acceleration.
1 =
RAMP
Ramp acceleration as set.
2 =
FLYING START
Flying start. Use this setting if the motor is already rotating and the drive will
start smoothly at the current 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.
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
1 or 2205
TIME
2103 TORQ BOOST CURR
Maximum supplied current during torque boost. See also parameter 2101
.
FUNCTION
2104 STOP DC INJ TIME
DC injection time after modulation has stopped. If 2102
(
), ACS 140 uses DC braking. If 2102
COAST
ACS 140 uses DC hold after ramp.
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.
Note! Too long a DC injection time causes the motor to warm up.
TORQ BOOST CURR
2.
DECELER TIME
PREMAGN MAX TIME
.
STOP FUNCTION
.
DECELER
START
is 1
STOP FUNCTION
is 2 (
),
RAMP
41
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