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F15, F16 Frequency Limiter (High), Frequency Limiter (Low) H63 Low Limiter (Mode selection)
Frequency Limiter (High and Low) (F15, F16) Data setting range: 0.0 to 500.0 (Hz)
F15 and F16 specify the upper and lower limits of the output frequency or reference frequency, respectively. The object
to which the limit is applied differs depending on the control system.
Object to which the limit is applied
Frequency Limiter
V/f control Vector control without/with speed sensor
Frequency Limiter (High) F15 Output frequency Reference speed (reference frequency)
Frequency Limiter (Low) F16 Reference frequency Reference speed (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.
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:
Data for H63 Operation
0 The output frequency will be held at the low level specified by F16.
1 The inverter decelerates to stop the motor.
(H63 = 0) (H63 = 1)
• When you change the frequency limiter (High) (F15) in order to raise the reference frequency, be sure to
change the maximum frequency (F03) accordingly.
• Maintain the following relationship among the data for frequency control:
F15 > F16, F15 > F23, and F15 > F25
F03 > F16
where, F23 and F25 specify the starting and stop frequencies, respectively.
If you specify any wrong data for these function codes, the inverter may not run the motor at the desire
speed, or cannot start it normally.
F18 Bias (Frequency command 1) (Refer to F01.)
F20 to F22
H95
DC Braking 1 (Braking starting frequency, Braking level, and Braking time)
DC Braking (Braking response mode)
F20 through F22 specify the DC braking that prevents motor 1 from running by inertia during decelerate-to-stop
operation.
If the motor enters a decelerate-to-stop operation by turning OFF the run command or by decreasing the reference
frequency below the stop frequency, the inverter activates the DC braking by flowing a current at the braking level
(F21) during the braking time (F22) when the output frequency goes down to the DC braking starting frequency (F20).
Setting the braking time to "0.0" (F22 = 0) disables the DC braking.
Braking starting frequency (F20) Data setting range: 0.0 to 60.0 (Hz)
F20 specifies the frequency at which the DC braking starts its operation during motor decelerate-to-stop state.
Braking level (F21) Data setting range: 0 to 100 (%) (0 to 80 (%) for MD/LD-mode inverters)
F21 specifies the output current level to be applied when the DC braking is activated. The function code data should be
set, assuming the rated output current of the inverter as 100%, in increments of 1%.
The inverter rated output current differs between the HD and MD/LD modes.
Braking time (F22) Data setting range: 0.01 to 30.00 (s), 0.00 (Disable)
F22 specifies the braking period that activates DC braking.
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