Vacon Plc
Phone: +358-201 2121
Fax:+358-201 212 205
Service: +358-40-8371 150
E-mail: [email protected]
E-mail: [email protected]
Vacon
Page 33
Pump control with autochange
4. 6
Start function
Ramp:
0
The frequency converter 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 frequency converter is able to start into running motor by applying a small
torque to motor and searching for 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 accelerated/decelerated to the set reference value according
to the set acceleration/deceleration parameters.
Use this mode if the motor may be coasting when the start command is given.
With the flying start it is possible to ride through short mains voltage
interruptions.
4. 7
Stop function
Coasting:
0
The motor coasts to a halt without any control from the frequency converter,
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.
4. 8
DC braking current
Defines the current injected into the motor during the DC braking.
