Code Alarm F60 Installation Manual Page 82

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Application Parameters
82 S1A53838 09/2011
Application parameters
Code Name / Description Adjustment range Factory setting
FH
[Max frequency]
Maximum Frequency 30.0 Hz to 200.0 Hz 50.0 Hz
The setting of parameter FH determines the maximum output frequency of the drive.
FH limits the setting of parameter [Upper limit freq] (UL) (see page 82
), which can be adjusted while the drive is operating.
Acceleration and deceleration rates are also affected by the setting of FH, as the definition of [Acceleration time 1] (ACC) or
[Deceleration time 1] (dEC) (see page 83
) is the time it takes for the drive to ramp the motor up or down between zero speed
and the setting of FH.
FH can only be adjusted while the drive is stopped.
UL
[Upper limit freq]
High speed 0.5 to [Max frequency] (FH) Hz 50.0 Hz
Parameter UL sets the maximum frequency that can be commanded to the drive by the local or remote speed reference source.
The top end of its range is limited by the setting of Maximum frequency [Max frequency] (FH). See diagram above.
LL
[Low limit frequency]
Low speed 0.0 to [Upper limit freq] (UL) Hz 0.0 Hz
Parameter LL sets the minimum frequency that can be commanded to the drive by the local or remote speed reference source.
See diagram above.
F240
[Mot start freq.]
Output Starting Frequency
0.5 to 10.0 Hz 0.5 Hz
The setting of parameter F240 determines the drive’s output frequency at the moment it receives a start command. There is
no acceleration time to reach the parameter F240 level.
Parameter F240 is typically set for the rated slip frequency of the motor. This allows motor torque to be generated as soon as
a start command is given. Adjust parameter F240 when a delay in the motor’s response to a start command adversely affects
the application.
To determine the motor’s slip frequency:
1) Subtract the motor’s rated speed at full load from it’s no-load speed (in rpm).
2) Divide the result by the no-load speed.
3) Multiply this result by the motor’s rated frequency in Hz.
Example:
Motor no-load speed = 1500 rpm
Motor rated speed at full load = 1450 rpm
Motor rated frequency = 50 Hz
1500 rpm – 1450 rpm = 50 rpm
50 rpm / 1500 rpm = 3.33%
50 Hz x 0.0333 = 1.7 Hz (motor slip frequency)
0
100%
0
100%
Output frequency (Hz) Output frequency (Hz)
Speed Reference Speed Reference
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