ABB ACS355 series User Manual page 229

All parameters
No. Name/Value
SPD COMP
REV
2103 DC MAGN
TIME
0.00...10.00 s
2104 DC HOLD CTL Activates the DC hold or DC braking function.
NOT SEL
DC HOLD
Description
Speed compensation is used for constant distance braking if
the direction of rotation is reverse. Speed difference
(between used speed and maximum speed) is
compensated by running the drive with current speed before
the motor is stopped along a ramp. See section
Acceleration and deceleration ramps
If the direction of rotation is forward, the drive is stopped
along a ramp.
Defines the pre-magnetizing time. See parameter
START FUNCTION. After the start command, the drive
automatically pre-magnetizes the motor for the defined time.
Magnetizing time. Set this value long enough to allow full
motor magnetization. Too long a time heats the motor
excessively.
Inactive
DC hold function active. DC hold is not possible if parameter
9904 MOTOR CTRL MODE
When both the reference and the motor speed drop below
the value of parameter
will stop generating sinusoidal current and start to inject DC
into the motor. The current is set by parameter
CURR REF. When the reference speed exceeds parameter
2105 value, normal drive operation continues.
Motor speed
Ref
DC hold speed
Note: DC hold has no effect if the start signal is switched
off.
Note: Injecting DC current into the motor causes the motor
to heat up. In applications where long DC hold times are
required, externally ventilated motors should be used. If the
DC hold period is long, the DC hold cannot prevent the
motor shaft from rotating if a constant load is applied to the
motor.
Actual signals and parameters 229
on page 141.
setting is SCALAR:
2105 DC HOLD SPEED, the drive
DC hold
Def/FbEq
5
2101 0.30 s
1 = 0.01 s
NOT SEL
0
1
FREQ.
2106 DC
t
t