Toshiba Tosvert VF-AS1 - Manual (Page 144)

E6581301
F-32
6
■ 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]
H
H
Time [s]
H Stall
t1 ts t2
H (Momentary acceleration (deceleration) suspend time) = (t1 + t2 + ts)
Q 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 : H (Stall prevention level 1)
Overload stall
: QNO (Motor overload protection characteristic selection)
Overvoltage stall : H (Overvoltage limit operation)
Note: Setting the frequency command at the same frequency as the acceleration suspend frequency (H)
disables the acceleration suspend function.
Similarly, setting the frequency command at the same frequency as the deceleration suspend frequency
(H) disables the deceleration suspend function.
6.19 Commercial power/inverter switching
H : Commercial power/inverter switching output selection
H : Commercial power/inverter switching frequency
H : Inverter-side switching waiting time
H : Commercial power-side switching waiting time
H : 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 6.41.
[Parameter setting]
Title Function Adjustment range Default setting
H
Commercial power/inverter
switching output selection
:Deselect
:Automatic switching in the event of a trip
:Commercial power switching frequency setting
:Commercial power switching frequency setting +
automatic switching in the event of a trip [Note1]
H
Commercial power/inverter
switching frequency
~WNHz
Inverter with a
model number
ending with
-WN:
-WP:
H
Inverter-side switching
waiting time
~ sec.
According to
model
H
Commercial power-side
switching waiting time
~ sec.
H
Commercial power switching
frequency holding time
~ sec.
Note1: For trips whose causes are displayed with EN, GH, GH or G, switching is not done automatically.
Note2: Braking function H doesn't operate.