ABB ACS550 Series, User Manual

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128 ACS550 User’s Manual
Parameters
Group 21: START/STOP
This group defines how the motor starts and stops. The ACS550 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
MOTOR CTRL MODE
.
1 =
AUTO
– Selects the automatic start mode.
• Vector control modes: Optimal start in most cases. The drive automatically selects the correct output frequency to
start a rotating motor.
•
SCALAR
:
FREQ
mode: Immediate start from zero frequency.
2 =
DC MAGN
– Selects the DC Magnetizing start mode.
Note: The DC Magnetizing start mode cannot start a rotating motor.
Note: The drive starts when the set pre-magnetizing time (parameter 2103
DC MAGN TIME
) has passed, even if motor
magnetization is not complete.
• Vector control modes: Magnetizes the motor within the time determined by the parameter 2103
DC MAGN TIME
using DC current. The normal control is released exactly after the magnetizing time. This selection guarantees
the highest possible break-away torque.
•
SCALAR
:
FREQ
mode: Magnetizes the motor within the time determined by the parameter 2103
DC MAGN TIME
using
DC current. The normal control is released exactly after the magnetizing time.
3 =
SCALAR FLYST
– Selects the flying start mode.
• Vector control modes: Not applicable.
•
SCALAR
:
FREQ
mode: The drive automatically selects the correct output frequency to start a rotating motor – useful
if the motor is already rotating and if the drive will start smoothly at the current frequency.
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 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 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 magnetized. If the speed is found to be zero, the torque
boost is done.
8 =
RAMP
– Immediate start from zero frequency.
2102 STOP FUNCTION
Selects the motor stop method.
1 =
COAST
– Selects cutting off the motor power as the stop method. The motor coasts to stop.
2 =
RAMP
– Selects using a deceleration ramp.
• Deceleration ramp is defined by 2203
DECELER TIME
1 or 2206
DECELER TIME
2 (whichever is active).
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.
2104 DC HOLD CTL
Selects whether DC current is used for braking or DC Hold.
0 =
NOT SEL
– Disables the DC current operation.
1 =
DC HOLD
– Enables the DC Hold function. See the diagram.
• Requires parameter 9904
MOTOR CTRL MODE
= 1 (
VECTOR
:
SPEED
)
• Stops generating sinusoidal current and injects DC into the motor when
both the reference and the motor speed drop below the value of parameter
2105.
• When the reference rises above the level of parameter 2105 the drive
resumes normal operation.
2 =
DC BRAKING
– Enables the DC Injection Braking after modulation has
stopped.
• If parameter 2102
STOP FUNCTION
is 1 (
COAST
), braking is applied after start is removed.
• If parameter 2102
STOP FUNCTION
is 2 (
RAMP
), braking is applied after ramp.
speed
Ref
DC hold
DC hold
Motor
speed
T
T