Toshiba Tosvert VF-AS1 - Manual (Page 89)

E6581301
E-23
5
■ Setting of motor electronic thermal protection level 1 VJT
If the capacity of the motor is smaller than the capacity of the inverter, or the rated current of the motor is smaller
than the rated current of the inverter, adjust the electronic thermal protection level 1 VJT so that it fits the motor's
rated current.
* If the indications are in percentages[%], then 100% equals the inverter's rated output current [A].
VJT ×0.6
VJT ×1.0
H =Hz Output frequency [Hz]
Output current reduction factor [%]/[A]
0
Setting the motor overload starting level
2) Motor 150%-overload time limit H
The motor 150%-overload time limit parameter H is used to set the time elapsed before the motor trips under
a load of 150% (overload trip QN) within a range of 10 to 2400 sec.
[Example setting]
Monitored output
current [%]
Motor overload time [s] (Outline data)
H = H =
VJT = VJT=
H 0.01Hz H 0.01Hz
68 34 – 7200 – 3600
70 35 – 3600 – 1800
80 40 – 1000 – 500
90 45 – 600 – 300
100 50 – 420 – 210
112 56 12000 310 6000 155
120 60 2400 270 1200 135
130 65 1200 230 600 115
140 70 800 190 400 95
150 75 600 170 300 85
200 100 270 110 135 55
Monitored output current [%]
time [s]
Motor 150%-
overload time limit
H
Motor overload
0
VJT ×0.6
VJT ×1 .1
VJT ×1.5
Operation
frequency
no less than
H
Operation frequency
0.01Hz *1
*1 Except for the cases of
H = , [Hz]
Motor overload protection characteristics
[Parameter setting]
Title Function Adjustment range Default setting
H Motor 150%-overload time limit ~ sec.