Toshiba TOSVERT VF-S11 Instruction Manual page 96

Parameter setting
Title Function
Motor electronic thermal pro-
tection level 1
Electronic-thermal protection
characteristic selection
1) Setting the electronic thermal protection characteristics selection
motor electronic thermal protection level 1
The electronic thermal protection characteristics selection
load trip function ( ) and the overload stall function.
While the inverter overload trip (
can be selected using the parameter
Explanation of terms
Overload stall: This is an optimum function for equipment such as fans, pumps and blowers with
variable torque characteristics that the load current decreases as the operating speed
decreases.
When the inverter detects an overload, this function automatically lowers the output
frequency before the motor overload trip
motor at frequencies that allow the load current to keep its balance so that the
inverter can continue operation without being tripped.
Note: Do not use the overload stall function with loads having constant torque characteristics (such as
conveyor belts in which load current is fixed with no relation to speed).
[Using standard motors (other than motors intended for use with inverters)]
When a motor is used in the lower frequency range than the rated frequency, that will decrease the cooling
effects for the motor. This speeds up the start of overload detection operations when a standard motor is
used in order to prevent overheating.
Adjustment range
10 - 100 %
Setting
value
0
1
Standard
2 motor
3
4
VF motor
5
(special
6
motor)
7
is used to enable or disable the motor over-
) will be in constant detect operation, the motor overload trip (
E-23
E6581158
Default setting
Overload Overload
protection stall
×
× ×
×
×
× ×
×
: valid, × : invalid
*
is activated. This function operates a
100
and
5
)