Appendix F: PID Control
Page F–13
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Type Hex Addr Dec Addr
P6.25 Upper Limit of Output Frequency
♦R/W 0619 41562
Range/Units Default
0.00~600.00 Hz
600.00
Type Hex Addr Dec Addr
P6.26 Lower Limit of Output Frequency
♦R/W 061A 41563
Range/Units Default
0.00~600.00 Hz
0.00
The setting of output frequency upper/lower limit is used to prevent mis-operation, machine
damage, overheating due to too low operation frequency, and damage due to too high speed.
P6.25 Output Frequency Upper Limit:
•
This setting limits the maximum output frequency of the drive. When the drive frequency
command or feedback control frequency is higher than this setting, the drive output frequency
will be limited by the upper limit of output frequency.
•
This parameter must be equal to or greater than the Lower Limit of Output Frequency (P6.26).
•
If the Upper Limit of Output Frequency is 50Hz and the Maximum Output Frequency is 60Hz, then
any Command Frequency above 50Hz will generate a 50Hz output from the drive.
•
If the frequency output upper limit is 60Hz and frequency command is also 60Hz, the drive won’t
exceed 60Hz even after slip compensation. If the output frequency needs to exceed 60Hz, then
increase output frequency upper limit limit or max operation frequency.
•
When the drive enters into the function of slip compensation (P2.01) or PID feedback control, the
drive output frequency may exceed the frequency command but still be limited by this setting.
•
The Output Frequency is also limited by the Motor Maximum RPM (P0.04).
P6.26 Output Frequency Lower Limit:
•
This setting limits the minimum output frequency of the drive. When the drive frequency
command or feedback control frequency is lower than this setting, the drive output frequency will
be limited by the lower limit of output frequency.
•
This parameter must be equal to or less than the Upper Limit of Output Frequency (P6.25).
•
When the drive starts, it will operate from min output frequency (P2.08, 2.12) and accelerate to
the setting frequency. The starting ramp won’t be limited by this parameter setting; it will only
limit the minimum setpoint frequency.
•
If the Lower Limit of Output Frequency is 10Hz, and the Minimum Output Frequency (P2.08, P2.16)
is set at 5.0Hz, then any Command Frequency between 5~10 Hz will generate a 10Hz output from
the drive. A Command Frequency of less than 5Hz will not result in an output from the drive.
•
When the drive enters into the function of slip compensation (P2.01) or PID feedback control, the
drive output frequency may exceed the frequency command but still be limited by this setting.
Related parameters: P0.04, P2.01, P2.08, P2.16, P6.25
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