Toshiba Tosvert VF-A5 - Manual (Page 78)

u r .
(Protection Parameters)
Related parameters
t H r /
Motor overload protection level D L L
D L F OL reduction start-up frequency
Motor 150% overload time limit
The motor overload^ protection level I t H r I lean be adjusted according to the motor rating and
characteristics.
Operaing frequency Operating frequency
Motor overload start-up level
When operating a motor at low frequencies, the motor’s
cooling ability decreases. Therefore, the OL reduction
start-up frequency | Q L F I can be used to lower the
OL operation start-up level.
This should be set according to the motor characteristics.
The following settings are recommended:
30Hz for a standard motor
6Hz for a VF motor
Output current
By setting
I Q L
fc I , the time before an OL trip will
occur when the motor is operated at 150% load can be
adjusted between 10 and 2400 seconds.
72 -