ABB ACH550-UH User Manual page 122

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Group 21: START/STOP
This group defines how the motor starts and stops. The ACH550 supports several
start and stop modes.
Code Description
2101 START FUNCTION
Selects the motor start method. The valid options depend on the value of parameter 9904
1 = – Selects the automatic start mode.
AUTO
• Vector control modes: Optimal start in most cases. The drive automatically selects the correct output frequency
to start a rotating motor.
• : mode: Immediate start from zero frequency. Identical to selection 8 =
SCALAR FREQ
2 = – Selects the DC Magnetizing start mode.
DC MAGN
Note: The DC Magnetizing start mode cannot start a rotating motor.
Note: The drive starts when the set pre-magnetizing time (parameter 2103
magnetization is not complete.
• Vector control modes: Magnetizes the motor within the time determined by the parameter 2103
using DC current. The normal control is released exactly after the magnetizing time. This selection guarantees
the highest possible break-away torque.
• : mode: Magnetizes the motor within the time determined by the parameter 2103
SCALAR FREQ
DC current. The normal control is released exactly after the magnetizing time.
3 = – Selects the flying start mode.
SCALAR FLYST
• Vector control modes: Not applicable.
• : mode: The drive automatically selects the correct output frequency to start a rotating motor – useful
SCALAR FREQ
if the motor is already rotating and if the drive will start smoothly at the current frequency.
• Cannot be used in multimotor systems.
4 = – Selects the automatic torque boost mode (
TORQ BOOST
• May be necessary in drives with high starting torque.
• Torque boost is only applied at start, ending when output frequency exceeds 20 Hz or when output frequency is
equal to reference.
• In the beginning the motor magnetizes within the time determined by the parameter 2103
DC current.
• See parameter 2110
5 = + – Selects both the flying start and the torque boost mode (
FLY BOOST
• Flying start routine is performed first and the motor is magnetized. If the speed is found to be zero, the torque
boost is done.
8 = – Immediate start from zero frequency.
RAMP
2102 STOP FUNCTION
Selects the motor stop method.
1 = – Selects cutting off the motor power as the stop method. The motor coasts to stop.
COAST
2 = – Selects using a deceleration ramp.
RAMP
• Deceleration ramp is defined by 2203
2103 DC MAGN TIME
Defines the pre-magnetizing time for the DC Magnetizing start mode.
• Use parameter 2101 to select the start mode.
• After the start command, the drive pre-magnetizes the motor for the time defined here and then starts the motor.
• Set the pre-magnetizing time just long enough to allow full motor magnetization. Too long a time heats the motor
excessively.
Parameters
Group 21: Start/Stop
Range
Vector control modes:
1, 2, 8
Scalar control mode:
1...5, 8
.
TORQ BOOST CURR
1, 2
DECELER TIME
0.00...10.00 s
Resolution
1
DC MAGN TIME
: mode only).
SCALAR FREQ
:
SCALAR
1
1 or 2206 2 (whichever is active).
DECELER TIME
0.01 s
ACH550-UH User's Manual
Default
3 ( )
SCALAR FLYST
.
MOTOR CTRL MODE
.
RAMP
) has passed, even if motor
DC MAGN TIME
DC MAGN TIME
using
DC MAGN TIME
mode only).
FREQ
1 ( )
COAST
0.30 s
S

using