Speed Limit (Frequency Reference Limits); Limiting The Maximum Output Frequency; Limiting The Minimum Output Frequency - Omron VARISPEED F7 User Manual

Speed Limit (Frequency Reference Limits)

Limiting the Maximum Output Frequency

If the motor is not allowed to rotate above a certain frequency, use parameter d2-01 to set a frequency refer-
ence upper limit.
The limit value is set as a percentage, taking E1-04 (Maximum Output Frequency) to be 100%.
Related Parameters
Parameter
No.
d2-01

Limiting the Minimum Output Frequency

If the motor is not allowed to rotate below a certain frequency, use parameters d2-02 or d2-03 to set a fre-
quency reference lower limit.
There are two methods of limiting the minimum frequency, as follows:
Set d2-02 to adjust the minimum level for all frequencies.
•
Set d2-03 to adjust the minimum level for the master speed frequency (i.e., the lower level is not valid for
•
the jog frequency, multi-step speed frequency, and auxiliary frequency).
Related Parameters
6
Parameter
No.
d2-02
d2-03
Adjusting Frequency Lower Limit Using an Analog Input
If parameter H3-09 (analog input A2 function selection) is set to 9 (output frequency lower level), the fre-
quency lower level can be adjusted using the terminal A2 input level (see
If parameter 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.
32
6-
Name
Frequency reference upper limit
Name
Frequency reference lower limit
Master speed reference lower limit
Output frequency lower level
Max. output frequency
E1-04
0 V
(4 mA)
Fig 6.38 Analog Input A2 Characteristics for Frequency Reference Lower Limit
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
100.0% No A A
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
0.0% No A A
0.0% No A A
Fig 6.38).
Multi-function analog input
10 V
terminal A2 input level
(20 mA)
Open Closed
Loop Loop
Vector Vector
A A
Open Closed
Loop Loop
Vector Vector
A A
A A