Deviation Limit Of Pid Control; Pid Control With Sleep Function - Toshiba TOSVERT VF-AS3 Instruction Manual

4. 3. 5

Deviation limit of PID control

When the setting value of [ACC] or [dEC] is made larger to have gradual acceleration/deceleration, the output
frequency may be limited by the acceleration/deceleration operation and the frequency may become excessive at a
rapid change of PID control output. In this case, set the deviation limit to avoid the influence of acceleration/
deceleration operation.
* Set the deviation limit up to the following values.
[FH] × [F363]
[F364] ≤
[ACC]
4. 3. 6

PID control with Sleep function

■ Function
PID function can be used with sleep function.
Sleep function is that sustains the inverter to stop state (sleep state), by the detection of the inverter output
power decaying.
Sleep function is useful for protecting motors from long term and low speed driving, and avoiding low speed
driving that cause low energy efficiency.
Inverter in running state becomes sleep state under the condition as follow.
• PID output frequency ≤ [LL] + [F398] after [F256] setting time is expired.
Inverter in sleep state becomes running state under the condition as follows.
• [F392] ≠ "0.0Hz", and "PID differential ≥ [F392]".
• [F392] = "0.0Hz" and [F393] ≠ "0.0Hz", and "PID feedback ≤ [F393]".
• PID set value > [LL] + [F391]
■ Note
• Set [F256] other than "0.0" (s), in case of using sleep function.
Otherwise, not going to sleep state.
• Set one of [F392], or [F393] other than "0.0" (Hz), in case of using sleep function.
Otherwise, not recovering from sleep state correctly.
• Don't set [F371] (PID1 output lower limit) greater than "[LL] + [F398]".
Otherwise, not going to sleep state, because frequency does not reach to "[LL] + [F398]".
• Sleep state is cancelled when RUN command is released.
• "LStP" alarm is on the operation panel at sleep state.
■ Caution
• When sleep function is selected, stand clear of motors and machines at sleep state.
The motors and machines which have stopped due to sleep state will become running state suddenly, and
this will result in injury.
Take measures for securing safety even if the motor restarts unexpectedly, such as attaching a cover to the
motor.
• Attach caution labels indicating functions programmed for sleep function, on inverters, motors and
machines.
Please prevent accidents with the caution labels.
VF-AS3
[FH] × [F363]
[F365] ≤
[dEC]
4-13
E6582112
4. Setting for PID control
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