ACS 300 User’s Manual 55
Chapter 7 - Drive Parameters
Note! Min and Max Freq parameters are ignored when constant
speed is used.
I LIMIT
This setting is the maximum output current the ACS 300 will
supply to the motor.
START(FUNCTION)
ACC RAMP
Ramp acceleration as set on Page 1 / Page 4 parameter ACC 1
(or ACC 2 as selected by digital inputs in Standard and Alternate
I/O mode, refer to pages 28 to 32).
FLYING
Use this setting to start the motor if it is already rotating, as in a
fan drive. The drive will start smoothly at the current frequency
instead of starting at 0 Hz. By selecting FLYING, the drive will be
able to ride through short interruptions of the mains supply.
Note! Flying start searches for the running speed by applying a
small torque to the load at the maximum frequency and
decreasing the output frequency until the load speed is found. If
the motor is not coupled to a load or the load has low inertia, the
motor will start at a speed higher than the set reference.
Note! If the motor and load are rotating in a direction opposite to
the commanded rotation, the ACS 300 will start the motor from
0 Hz and accelerate according to the selected acceleration ramp.
AUTO BOOST
Automatic start current boost, which may be necessary in drives
with high starting torque. Automatic torque boost is active only
from 0 Hz to 20 Hz or until the reference speed is reached.
Torque boost is not activated if the output frequency falls below
20 Hz while running. See also Page 2 parameter IR COMP.
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