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Programming Your Application
1-41
690+ Series Frequency Inverter
FLYCATCHING
Designed for all Motor Control Modes.
This block performs a directional speed
search. It allows the Inverter to
seamlessly catch a spinning motor before
controlling the motor to the desired
setpoint.
This is especially useful for large inertia
fan loads, where drafts in building air
ducts can cause a fan to `windmill’.
MMI Menu Map
1
SETUP
2
MOTOR CONTROL
3
FLY CATCHING
VHZ ENABLE
VECTOR ENABLE
START MODE
SEARCH MODE
SEARCH VOLTS
SEARCH BOOST
SEARCH TIME
MIN SEARCH SPEED
REFLUX TIME
ACTIVE
SETPOINT
Flycatching
ACTIVE
[576]
–
FALSE
SETPOINT
[ 28]
–
0.00 %
FALSE
–
[570]
VHZ ENABLE
–
TRUE
–
[1553] VECTOR ENABLE
–
ALWAYS
–
[571]
START MODE
–
BIDIRECTIONAL
–
[572]
SEARCH MODE
–
** 9.00 %
–
[573]
SEARCH VOLTS
–
** 40.00 %
–
[ 32]
SEARCH BOOST
–
** 10.0 s
–
[574]
SEARCH TIME
–
5.0 Hz
–
[575]
MIN SEARCH SPEED
–
** 3.0 s
–
[709]
REFLUX TIME
–
Parameter Descriptions
VHZ ENABLE
Range: FALSE / TRUE
Enables flycatching in Volts/Hz Control mode when TRUE.
VECTOR ENABLE
Range: FALSE / TRUE
Enables flycatching in Vector Control mode when TRUE.
START MODE
Range: Enumerated - see below
The mode of operation for the flycatching sequence software.
Enumerated Value
:
Start Mode
0 : ALWAYS
1 : TRIP OR POWERUP
2 : TRIP
SEARCH MODE
Range: Enumerated - see below
The type of speed search carried out by the flycatching sequence.
Enumerated Value
:
Search Mode
0 : BIDIRECTIONAL
1 : UNIDIRECTIONAL
SEARCH VOLTS
Range: 0.00 to 100.00 %
The percentage level of the search volts applied to the motor during the speed search phase of
the flycatching sequence. Increasing this parameter improves the accuracy of the discovered
motor speed but increases the braking influence of the speed search on the rotating motor.
SEARCH BOOST
Range: 0.00 to 50.00 %
The level of search boost applied to the motor during the speed search phase of the flycatching
sequence.
SEARCH TIME
Range: 0.1 to 60.0 s
The search rate during the speed search phase of the flycatching sequence. Performing the
flycatching speed search too quickly can cause the drive to inaccurately identify the motor
speed. Refluxing at an inaccurate motor speed can cause the drive to trip on overvoltage. If this
occurs, increasing this parameter will reduce the risk of tripping.
MIN SEARCH SPEED
Range: 0.0 to 500.0 Hz
The lowest search speed before the speed search phase of the flycatching sequence is
considered to have failed.
REFLUX TIME
Range: 0.1 to 20.0 s
The rate of rise of volts from the search level to the working level after a successful speed
search. Refluxing the motor too quickly can cause the drive to trip on either overvoltage or
overcurrent. In either case, increasing this parameter will reduce the risk of tripping.