SLX9000 Adjustable Frequency Drives User Manual
9-2
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MN04003020E
January 2009
2.1.11 Start function
ID505
Ramp:
0
The drive starts from 0 Hz and accelerates to maximum frequency
within the set acceleration time. (Load inertia or starting friction may
cause prolonged acceleration times).
Flying start:
1
The drive is able to start into a running motor by applying a small
torque to motor and searching for the frequency corresponding to the
speed the motor is running at. Searching starts from the maximum
frequency towards the actual frequency until the correct value is
detected. Thereafter, the output frequency will be increased/decreased
to the set reference value according to the set acceleration/deceleration
parameters.
Use this mode if the motor is coasting when the start command is
given. With the flying start, it is possible to ride through short utility
voltage interruptions.
2.1.12 Stop function
ID506
Coasting:
0
The motor coasts to a halt without control from the drive after the Stop
command.
Ramp:
1
After the Stop command, the speed of the motor is decelerated
according to the set deceleration parameters.
If the regenerated energy is high it may be necessary to use an external
braking resistor for faster deceleration.
2.1.13 V/Hz optimization
ID109
0
Not used
1
Automatic torque boost
The voltage to the motor changes automatically which makes the motor
produce sufficient torque to start and run at low frequencies. The
voltage increase depends on the motor type and power. Automatic
torque boost can be used in applications where starting torque due to
starting friction is high, e.g. in conveyors.
Note:
In high torque — low speed applications — it is likely that the motor will
overheat. If the motor has to run a prolonged time under these
conditions, special attention must be paid to cooling the motor. Use
external cooling for the motor if the temperature tends to rise too high.
Summary of Contents for Cutler-Hammer SLX9000 Series
Page 1: ...SLX9000 Adjustable Frequency Drives User Manual Effective January 2009 Supersedes October 2008...
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