5.3 Description of Function Codes
5-73
FUNCTION CODES
Chap 5
F15, F16
Frequency limiter (Upper limit), Frequency limiter (Lower limit)
Related function codes: H63 Lower limit Limiter (Mode selection)
■ Frequency limiter (Upper limit) (Lower limit) (F15, F16)
F15 and F16 specify the upper and lower limits of the output frequency or reference frequency, respectively.
Frequency Limiter Object to which the limit is applied
Frequency limiter (Upper) F15 Output frequency
Frequency limiter (Lower) F16 Reference frequency
When the limit is applied to the reference frequency or reference speed, delayed responses of
control may cause an overshoot or undershoot, and the frequency may temporarily go beyond the
limit level.
• Data setting range: 0.0 to 500.0 (Hz)
■ Low Limiter (Mode selection) (H63)
H63 specifies the operation to be carried out when the reference frequency drops below the low level specified by
F16, as follows:
H63 data Action
0 The output frequency will be held at the low level specified by F16.
1 The inverter decelerates to stop the motor.
Refer to the figure below.
(For H63 = 0) (For H63 = 1)
• When changing the frequency limiter (Upper) (F15) in order to raise the reference frequency, be sure
to change the maximum frequency (F03) accordingly.
Set each function code related to operation frequency so that the relationship among
the following magnitude relationship.
- F15>F16, F15>F23, F15>F25
- F03>F16
However, F23 is the starting frequency, and F25 is stop frequency
If any wrong data is specified
for these function codes, the inverter may not run the motor at the
desired speed, or cannot start it normally.
F18
Bias (for frequency setting 1) (Refer to F01)
Refer to the description of function code F01 to find the details of bias (Frequency setting 1) setting.
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