Toshiba TOSVERT VF-AS1 Instruction Manual page 85

3) Inverter overload characteristics
Set to protect the inverter unit. Cannot be turned off by parameter setting.
The inverter has two overload detecting functions, which can be switched from one to another using parameter
 (inverter overload detection mode selection).
[Parameter setting]
Title

If the inverter overload trip function () is activated frequently, this can be improved by adjusting the stall
operation level  downward or increasing the acceleration time  or deceleration time .
= (Standard)
Protection is given uniformly regardless of ambient temperature, as shown by the 150%-60 sec overload curve in
the figure below.
Inverter overload
5
small/medium
capacity types: 120
large capacity types: 60
= (Temperature detection meth)
The overload protection level is adjusted automatically according to the ambient temperature. When the ambient
temperature is 50°C or below, the overload resistance is increased with respect to the overload resistance when
 is set to  (diagonally shaded area in the figure below).
small/medium
capacity types: 120
large capacity types: 60
Note 1: If the load applied to the inverter exceeds 150% of its rated load or the operation frequency is less than
Note 2: The inverter is factory-set so that, if the inverter becomes overloaded, it will automatically reduce the
Function
Inverter overload selection
time [s]
0
Inverter overload protection characteristics
time [s]
Ambient
temperature
of 50°C
0
Inverter overload protection characteristics
0.1Hz, the inverter may trip in a shorter time.
carrier frequency to avoid an overload trip. A reduction in carrier frequency causes an increase in noise
from the motor, but this does not affect the performance of the inverter.
If you do not want the inverter to reduce the carrier frequency automatically, set the parameter
=.
Adjustment range
:Standard (150％~60 sec.)
:Temperature detection meth
Current
[%]
111
120
130
140
150
165
200
110% 150%
110% 150%
E-24
E6581301
Default setting

Inverter overload time [s]
(Outline data)
2400
240
120
80
60
2
0.1
Monitored output current [%]
100%: Inverter rated output current
Monitored output current [%]
100%: Inverter rated output current