Delta MH300 Series - Page 359

Chapter 12 Description of Parameter Settings
MH300
12.1-01-6
 When Fcmd > Fmin and Fcmd < Fstart:
If Flow < Fcmd, drive runs directly by Fcmd.
If Flow ≥ Fcmd, drive runs by Fcmd, then rises to Flow according to acceleration time.
 The output frequency goes directly to 0 when decelerating to Fmin.

01-10
Upper Frequency Limit
Default: 599.00
Settings 0.00–599.00 Hz

01-11
Lower Frequency Limit
Default: 0.00
Settings 0.00–599.00 Hz
 If the frequency setting is higher than the upper limit (Pr.01-10), the drive runs with the upper
frequency limit. If the frequency setting is lower than lower limit (Pr.01-11) and higher than
minimum frequency (Pr.01-07), the drive runs with the lower frequency limit. Set the upper
frequency limit > lower frequency limit (Pr.01-10 setting value must be > Pr.01-11 setting value).
 If the PID control is enabled for the drive, the drive’s output frequency may exceed frequency
command but is still limited by this setting.
 Related parameters: Pr.01-00 Maximum Operation Frequency.
 When the drive starts, it operates from the minimum output frequency (Pr.01-07) and accelerates
to the setting frequency. It is not limited by the lower limit frequency.
 Use the settings of upper and lower frequency limit to prevent operator’s misuse, overheating
caused by operating at a too low frequency, or damage caused by excessive speed.
 If the upper frequency limit setting is 50 Hz and the frequency setting is 60 Hz, the maximum
output frequency is 50 Hz.
 If the lower frequency limit setting is 10 Hz and the minimum operation frequency setting (Pr.01-
07) is 1.5 Hz, the drive operates at 10 Hz when the frequency command is greater than Pr.01-07
and less than 10 Hz. If the frequency command is less than Pr.01-07, the drive stays in ready
status with no output.