21: Start/Stop - ABB ACH550-UH User Manual

ACH550-UH User's Manual

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.
1 = – Selects the automatic start mode.
AUTO
• control modes: Optimal start in most cases. The drive automatically selects the correct output frequency
VECTOR
to start a rotating motor.
• : mode: Immediate start from zero frequency.
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 (param. 2103) has passed, even if motor magnetization is
not complete.
• control modes: Magnetizes the motor within the time determined by the parameter 2103
VECTOR
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 SPEED
using DC current. The normal control is released exactly after the magnetizing time.
3 =
SCALAR FLYSTART
• control modes: Not applicable.
VECTOR
• control mode: The drive automatically selects the correct output frequency to start a rotating motor –
SCALAR
useful if the motor is already rotating and if the drive will start smoothly at the current frequency.
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 = +
FLYSTART TORQ 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.
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.
Group 21: Start/Stop
Range
1...5
– Selects the flying start mode.
.
TORQ BOOST CURR
– Selects both the flying start and the torque boost mode (
1, 2
DECELER TIME
0.00...10.00 s
Resolution
1
mode only).
SCALAR SPEED
1
1 or 2206 2 (whichever is active).
DECELER TIME
0.01 s
Default S
1
DC MAGN TIME
DC MAGN TIME
using
DC MAGN TIME
mode only).
SCALAR SPEED
1
0.30 s
Start-Up
97