Speed Limit (Frequency Reference Limit Function)
6-25
Speed Limit (Frequency Reference Limit Function)
This section explains how to limit the motor speed.
Limiting Maximum Output Frequency
If you do not want the motor to rotate above a given frequency, use constant d2-01.
Set the upper limit value of the frequency reference as a percentage, taking E1-04 (Maximum Output Fre-
quency) to be 100%.
Related Constants
Limiting Minimum Frequency
If you do not want the motor to rotate below a given frequency, use constants d2-02 or d2-03.
There are two methods of limiting the minimum frequency, as follows:
• Adjust the minimum level for all frequencies.
• Adjust the minimum level for the master speed frequency (i.e., the lower levels of the jog frequency,
multi-step speed frequency, and auxiliary frequency will not be adjusted).
Related Constants
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
d2-01 Frequency reference upper limit
Set the output frequency upper limit, taking the max. out-
put frequency to be 100%.
0.0 to
110.0
100.0% No A
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
d2-02 Frequency reference lower limit
Set the output frequency lower limit, taking the base refer-
ence to be 100%.
0.0 to
110.0
0.0% No A
d2-03
Master speed reference lower
limit
Set the master speed reference lower limit, taking the max.
output frequency to be 100%.
0.0 to
110.0
0.0% No A
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