Toshiba VF-AS1 instruction manual Commercial power/inverter switching, Stall control

E6581301

2)To suspend acceleration or deceleration by means of a signal from an external control device

Set ￿￿ for the desired external signal input terminal. As long as ON signals are inputted, the motor continues to rotate at a constant speed.

!!!!!!!!!!!

Output frequency [Hz]

Time [s]

Terminal board input

Ex.) When using the RR/S4 terminal as the acceleration/deceleration suspend terminal

Title	Function	Adjustment range	Example of setting
￿￿￿￿￿	Input terminal function selection 8 (RR/S4)	￿~￿￿￿	￿￿￿

■If the stall control function is activated during constant-speed rotation

The frequency drops momentarily as a result of stall control, but the time for which the frequency drops is included in the suspend time.

!!

Output frequency [Hz]

￿￿￿￿

￿￿￿￿

6 ￿￿￿￿

t1 ts t2

Time [s]

Stall ￿￿￿￿

(Momentary acceleration (deceleration) suspend time) = (t1 + t2 + ts)

￿ Stall control

Refers to the inverter’s function of automatically changing the operation frequency when it detects an overcurrent, overload or overvoltage. Using the following parameters, you can specify the way, the stall control is performed for each kind of stall.

Overcurrent stall : ￿￿￿￿ (Stall prevention level 1)

Overload stall : ￿￿ (Electronic thermal protection characteristic selection)

Overvoltage stall : ￿￿￿￿ (Overvoltage limit operation)

Note: Setting the frequency command at the same frequency as the acceleration suspend frequency (￿￿￿￿) disables the acceleration suspend function.

Similarly, setting the frequency command at the same frequency as the deceleration suspend frequency (￿￿￿￿) disables the deceleration suspend function.

6.19Commercial power/inverter switching

￿￿￿￿: Commercial power/inverter switching output selection

￿￿￿￿: Commercial power/inverter switching frequency

￿￿￿￿: Inverter-side switching waiting time

￿￿￿￿: Commercial power-side switching waiting time

￿￿￿￿: Commercial power switching frequency holding time

• Function

These parameters are used to specify whether to send a switching signal to an external sequencer (such as an MC) in the event that the inverter trips. The use of an input signal makes it possible to switch between inverter operation and commercial power operation without stopping the motor.

￿For details, see Instruction Manual (E6581364) specified in Section 6.42. [Parameter setting]

F-32