[Example of setting: VF-P7 2220P with a 18.5 kW motor (rated current: 66A)]
Key operated
LED display
MON
▲ ▼
ENT
ENT
▲ ▼
ENT
[VF motor (motor intended for use with an inverter)]
■Setting the electronic thermal protective function
Set value
Overload protection
VF motors (intended for use with an inverter) can be operated in lower frequency
ranges than general-purpose motors. If a VF motor is operated in an extremely low
frequency range, however, its cooling efficiency drops. In such a case, set the OL
reduction start frequency parameter according to the characteristics of the
motor. (See the figure below.)
As a guide, it is advisable to set this parameter around the default value (VF motor 6Hz).
Title
Overload reduction start-up
frequency
Note) is enabled when is set at , , , or .
■Setting the motor overload protection level #1
When the inverter is used for a motor with a capacity or a current rating smaller than that of the
inverter, it is necessary to adjust the motor overload protection level #1 parameter
according to the rated current of the motor.
When the output current is displayed in %,100% corresponds to the rated output current of the inverter.
Output current reduction rate [%]
Setting of motor overload start level
The running frequency is displayed. (Make this setting when the
motor is out of operation.)(If the monitor display mode setting
parameter is set at [Running frequency])
Press the MON key to call up the first basic parameter
(automatic acceleration/deceleration).
Switch to (extended parameters of from to
) by pressing the △ or ▽ key.
Press the Enter key to call up the parameter
(electronic thermal motor protection level 1).
Press the Enter key to display the parameter setting (set
value). (Default setting: %)
Change the parameter setting to
= (motor's rated current/inverter's rated output
= 66.0/88.0 x 100)
Press the Enter key to save the change. Then,
and the set value are displayed alternately.
Overload stall
protect
not stall
protect
not protect
not stall
not protect
Function
×1.0
×0.6
0
E-26
Operation
current) x 100
stall
stall
Adjustment range
∼ [Hz]
= 6.0
Default setting
Output frequency [Hz]