ABB ACS355 - Page 53

Actual signals and parameters 53
2621 SMOOTH
START
Selects the forced current vector rotation mode at low
speeds. When the smooth start mode is selected, the
rate of acceleration is limited by the acceleration and
deceleration ramp times (parameters 2202 and 2203
[see ACS355 User’s manual (3AUA0000066143
[English])]). If the process driven by the permanent
magnet synchronous motor has high inertia, slow
ramp times are recommended.
Can be used for permanent magnet synchronous
motors only (see chapter Appendix: Permanent
magnet synchronous motors (PMSMs) in ACS355
User’s manual (3AUA0000066143 [English])).
ALWAYS
NO Disabled 0
ALWAYS Enabled always when the frequency is below the
smooth start frequency (parameter 2623 SMOOTH
STARTFRQ). See ACS355 User’s manual
(3AUA0000066143 [English]).
1
START ONLY Enabled below the smooth start frequency (parameter
2623 SMOOTH START FRQ) only when starting the
motor.
2
2622 SMOOTH
START CUR
Defines the current used in the current vector rotation
at low speeds. Increase the smooth start current if the
application requires high pull-up torque. Decrease the
smooth start current if motor shaft swinging needs to
be minimized. Note that accurate torque control is not
possible in the current vector rotation mode.
This parameter can be used for permanent magnet
synchronous motors only (see chapter Appendix:
Permanent magnet synchronous motors (PMSMs) in
ACS355 User’s manual (3AUA0000066143
[English])).
10%
10...100% Value as a percentage of the nominal motor current. 1 = 1%
All parameters
No. Name/
Value
Description Def/ FbEq