VSD Series Drives User Manual Powered by Eaton Technology
15-12 For more information visit: www.johnsoncontrols.com LIT-1201828
November 2009
321 Start OFF Delay
Relay or Digital output OFF-delay time after start command is given.
401 Start Function
Ramp:
0 The drive starts from 0 Hz and accelerates to the set reference 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.
402 Stop Function
Coasting:
0 The motor coasts to a halt without any 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.
403 Brake chopper
0 No brake chopper used
1 Brake chopper in use and tested when running. Can be tested also in
READY state
2 External brake chopper (no testing)
3 Used and tested in READY state and when running
4 Used when running (no testing)
When the drive is decelerating the motor, the energy stored in the inertia of the motor
and the load is fed into an external brake resistor. This enables the drive to decelerate
the load with a torque equal to that of acceleration (provided that the correct brake
resistor has been selected). See the separate Brake resistor installation manual.
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