V5 series inverter
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P7.16 Close-loop preset frequency Range: 0~upper limit of frequency 0.00Hz
P7.17 Holding time of close-loop preset frequency Range: 0.0~250.0s 0.1s
This function can make the close-loop adjustment enter stable status.
When inverter is in close-loop running mode, it accelerates to close-loop preset frequency P7.16 in acc time, and is running for a
while (P7.17), then runs according to close-loop features. Refer to Fig 4-38.
Note: If no need the function of close-loop preset frequency, please set the preset frequency and holding time to 0.
P7.18 Threshold of PI zero frequency wakeup Range: 0.00~500.0Hz 0.01Hz
P7.19 Backlash of PI zero frequency wakeup Range: 0.00~500.0Hz 0.01Hz
The two function parameters are used to set PI threshold and backlash of zero-frequency wakeup.
If you set the frequency to 0 Hz, PI threshold of zero-frequency wakeup will be disabled.
For example: Fig 4-39:
Fig.4-39 zero-frequency backlash
Start process:
After start command is sent, the motor will start and accelerate to the preset frequency in the Acc time when the setting
frequency reaches or exceeds Fb.
Stop process:
The inverter will not stop immediately if the setting frequency is lower than Fb, only when the setting frequency reaches
Fa, the inverter will stop output.
Fa points to zero-frequency wakeup threshold (P7.18), Fb-Fa points to zero-frequency wakeup backlash (P7.19).
This function can realize domant function and save the energy, besides, the inverter will not frequent start at threshold fre-
quency by defining the backlash width.
4-2-9. Simple PLC operation parameters (Group P8)
Simple PLC function is a multi-speed generator, inverter can auto-change frequency and direction according to the running
time to satisfy the technical requirements. See Fig4-40.
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