ABB ACS350 User Manual page 184

184
Parameters – complete descriptions
Index Name/Selection
SPEED COMP
SPD COMP FWD
SPD COMP REV
2103 DC MAGN TIME
0.00...10.00 s
2104 DC HOLD CTL
NOT SEL
DC HOLD
DC BRAKING
2105 DC HOLD SPEED
0...360 rpm
Actual signals and parameters
Description
Speed compensation is used for constant distance braking. 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 Speed compensated stop
Speed compensation is used for constant distance braking if the direction of
rotation is forward. 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
page 108.
If the direction of rotation is reverse, the drive is stopped along a ramp.
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
page 108.
If the direction of rotation is forward, the drive is stopped along a ramp.
Defines the pre-magnetising time. See parameter
After the start command, the drive automatically pre-magnetises the motor
the set time.
Magnetising time. Set this value long enough to allow full motor
magnetization. Too long time heats the motor excessively.
Activates the DC Hold or DC braking function.
Inactive
DC Hold function active. DC Hold is not possible if parameter
CTRL MODE setting is SCALAR:FREQ.
When both the reference and the motor speed drop below the value of
parameter 2105 DC HOLD SPEED, the drive will stop generating sinusoidal
current and start to inject DC into the motor. The current is set by parameter
2106 DC CURR REF. When the reference speed exceeds parameter
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.
DC current braking function active.
If parameter 2102 STOP FUNCTION is set to COAST, DC braking is applied
after the start command is removed.
If parameter 2102 STOP FUNCTION is set to RAMP, DC braking is applied
after the ramp.
Defines the DC hold speed. See parameter
Speed
on page 108.
Speed compensated stop
Speed compensated stop
2101 START FUNCTION.
DC Hold
t
t
2104 DC HOLD CTL.
Def, FbEq
3
4
on
5
on
0.3
1 = 0.01 s
NOT SEL
0
9904 MOTOR 1
2105
2
5
1 = 1 rpm