5-42
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
Overload detection level (F11)
Data setting range: 1 to 135% of the rated current (allowable continuous drive current) of the inverter
In general, set the F11 data to the allowable continuous current of motor when driven at the base frequency (i.e. 1.0 to
1.1 times of the rated current of the motor.)
To disable the electronic thermal overload protection, set the F11 data to "0.00."
Thermal time constant (F12) Data setting range: 0.5 to 75.0 (minutes)
F12 specifies the thermal time constant of the motor. If the current of 150% of the overload detection level specified by
F11 flows for the time specified by F12, the electronic thermal overload protection becomes activated to detect the
motor overload. The thermal time constant for general-purpose motors including Fuji motors is approx. 5 minutes for
motors of 22 kW or below and 10 minutes for motors of 30 kW or above by factory default.
(Example) When the F12 data is set at 5 minutes
As shown below, the electronic thermal overload protection is activated to detect an alarm condition (alarm code
0l1
)
when the output current of 150% of the overload detection level (specified by F11) flows for 5 minutes, and 120% for
approx. 12.5 minutes.
The actual time required for issuing a motor overload alarm tends to be shorter than the specified value, taking into
account the time period from when the output current exceeds the rated current (100%) until it reaches 150% of the
overload detection level.
Example of Operating Characteristics
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