Speed Limit (Frequency Reference Limit Function)
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 Inverter output frequency as a percent, taking E1-04 (Maximum Output Frequency) to be 100%.
Related Constants
Constant
Number
Name Description d2-01
Frequency reference upper limit
Set the output frequency upper limit as a percent, taking the max. output frequency to be
100%.
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
0.0 to
110.0
100.0% No A A A A 289H
Limiting Minimum Frequency
If you do not want the motor to rotate at 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, multistep speed frequency, and auxiliary frequency will not be adjusted).
Related Constants
Constant
Number
Name Description d2-02 d2-03
Frequency reference lower limit
Sets the output frequency lower limit as a percentage of the maximum output frequency.
Master speed reference lower limit
Set the master speed reference lower limit as a percent, taking the max. output frequency to be
100%.
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
0.0 to
110.0
0.0% No A A A A 28AH
0.0 to
110.0
0.0% No A A A A 293H
6-
41
6
-42
Adjusting Frequency Lower Limit Using an Analog Input
If you set constant H3-09 (Multi-function Analog Input Terminal A2 Function Selection) or H3-05 (Multifunction Analog Input Terminal A3 Function Selection) to 9 (output frequency lower level), you can adjust the frequency lower level using the terminal A2 or A3 input level.
Output frequency lower level
Max. output frequency
E1-04
INFO
0 V
(4 mA)
10 V
(20 mA)
Multi-function analog input terminal A2 or A3 input level
Fig 6.34 Output Frequency Lower Level for Multi-function Analog Input
If constant d2-02 and terminal A2 output frequency lower level have been set at the same time, the larger set value will become the frequency lower limit.
