Limiting Minimum Frequency - YASKAWA G7 Series Technical Manual

Limiting Minimum Frequency

If you do not want the motor to rotate at below a given frequency, use parameters 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 Parameters
Name
Parameter
Number
Display
Frequency Determines maximum frequency
Reference reference, set as a percentage of
Lower Limit maximum output frequency
(E1-04). If the frequency
d2-02 reference is above this value,
actual Drive speed will be limited
Ref Lower
to this value. This parameter
Limit
applies to all frequency reference
sources.
Master Speed Determines maximum frequency
Reference reference, set as a percentage of
Lower Limit maximum output frequency (E1-
04). If the frequency reference is
d2-03
above this value, actual Drive
Ref1 Lower
speed will be limited to this value.
Limit
This parameter applies to all
frequency reference sources.
Adjusting Frequency Lower Limit Using an Analog Input
If you set parameter H3-09 (Multi-function Analog Input Terminal A2 Function Selection) or H3-05 (Multi-
function Analog Input Terminal A3 Function Selection) to 9 (output frequency lower level), you can adjust the
frequency lower level using the terminal A2 input level.
Output frequency lower level
Max. output frequency
E1-04
Fig 6.30 Output Frequency Lower Level for Multi-function Analog Input
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.
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Setting
Description
Range
0.0
to
110.0
0.0
to
110.0
0 V
(4 mA)
Speed Limit (Frequency Reference Limit Function)
Control Methods
Change
Factory
V/f
during
Setting
V/f with
Operation
PG
0.0% No A A
0.0% No A A
Multi-function analog input
terminal A2 or A3 input level
10 V
(20 mA)
Open Open
Loop Flux Loop
Vector Vector Vector
1 2
A A A
A A A
6-
31