Fuji Electric FRENIC-HVAC User Manual page 376

F15, F16 Frequency Limiter (High and Low)
Frequency Limiter (High and Low) (F15, F16)

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.
Frequency Limiter
Frequency Limiter (High)
Frequency Limiter (Low)
- Data setting range: 0.0 to 120.0 (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:
Data for H63
0
1
• When you change the frequency limiter (High) (F15) in order to raise the
• Maintain the following relationship among the data for frequency control:
F15
F16
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.
The output frequency will be held at the low level specified by F16.
The inverter decelerates to stop the motor.
(H63 = 0)
reference frequency, be sure to change the maximum frequency (F03)
accordingly.
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 desired speed, or cannot start it normally.
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H63 (Low Limiter, Mode selection)
Object to which the limit is applied
Output frequency
Reference frequency
Operation
(H63 = 1)
Reference speed
(reference frequency)
Reference speed
(reference frequency)