ABB ACH550-UH-011A-6, User Manual

Page: 230 / 478

Parameter listing and descriptions 225
ACH550-01 User's Manual
Group 21: START/STOP
This group defines how the motor starts and stops. The ACH550
supports several start and stop modes.
Code Description Range
2101 START FUNCTION 1…8
Selects the motor start method. The valid options depend on the value
of parameter 9904
MOTOR CTRL MODE
.
1 =
AUTO
– Selects the automatic start mode.
•
VECTOR
:
SPEED
mode: Optimal start in most cases. Flying start
function to a rotating axis and start at zero speed.
•
SCALAR
:
FREQ
mode: Immediate start from zero frequency.
2 =
DC MAGN
– Selects the DC Magnetising start mode. Identical to
selection 8 =
RAMP
.
Note: The DC Magnetising start mode cannot start a rotating motor.
Note: The drive starts when the set pre-magnetising time (parameter
2103
DC MAGN TIME
) has passed, even if motor magnetisation is not
complete.
•
VECTOR
:
SPEED
mode: Magnetises the motor within the time
determined by parameter 2103
DC MAGN TIME
using DC current. The
normal control is released exactly after the magnetising time. This
selection guarantees the highest possible break-away torque.
•
SCALAR
:
FREQ
mode: Magnetises the motor within the time
determined by the parameter 2103
DC MAGN TIME
using DC current.
The normal control is released exactly after the magnetising time.
3 =
SCALAR FLYST
– Selects the flying start mode.
SCALAR
:
FREQ
mode
only.
• The drive will automatically select the correct output frequency to
start a rotating motor. Useful if the motor is already rotating and the
drive will start smoothly at the current frequency.
• Cannot be used in multimotor systems.
4 =
TORQ BOOST
– Selects the automatic torque boost mode.
SCALAR
:
FREQ
mode only.
• May be necessary in drives with high starting torque.
• Torque boost is only applied at start, ending when the output
frequency exceeds 20 Hz or when output frequency is equal to
reference.
• In the beginning the motor magnetises within the time determined
by the parameter 2103
DC MAGN TIME
using DC current.
• See parameter 2110
TORQ BOOST CURR
.
5 =
FLY
+
BOOST
– Selects both the flying start and the torque boost
mode.
SCALAR
:
FREQ
mode only.
• Flying start routine is performed first and the motor is magnetised. If
the speed is found to be zero, the torque boost is done.
8 =
RAMP
– Immediate start from zero frequency.
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