Hitachi L100 사용자 설명서

“B” Group: Fine Tuning Functions

Configur

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The thermal overload detection protects the 
inverter and motor from overheating due to 
an excessive load. It uses a current/inverse 
time curve to determine the trip point.

First, use B_13 to select the torque charac-
teristic that matches your load. This allows 
the inverter to utilize the best thermal 
overload characteristic for your application.

The torque developed in a motor is directly 
proportional to the current in the windings, 
which is also proportional to the heat generated (and temperature, over time). Therefore, 
you must set the thermal overload threshold in terms of current (amperes) for parameter 
B_12. The range is 50% to 120% of the rated current for each inverter model. If the 
current exceeds the level you specify, the inverter will trip and log an event (error E05) in 
the history table. The inverter turns the motor output OFF when tripped.

WARNING: When parameter B_12, level of electronic thermal setting, is set to device 
FLA rating (Full Load Ampere nameplate rating), the device provides solid state motor 
overload protection at 115% of device FLA or equivalent. Parameter B_12, level of 
electronic thermal setting, is a variable parameter.

NOTE: For inverter models 005NFE, 011NFE, and 030HFE, the thermal value is less 
than the rated amperes (is the same as models 004NFE, 007NFE, and 040HFE respec-
tively). Therefore, be sure to set the electronic thermal overload according to the actual 
motor driven by the particular inverter.

Output frequency

Constant torque

Reduced

torque

B_13 = 01

B_13 = 00

Torque

5

20

60

120

Hz

100%

80%

60%

0

B_12 Level of electronic 

thermal setting

Set a level between 50% and 
120% for the rated inverter 
current.

✘

Rated current for each 

inverter model

*See note

%

E-THM LVL 03.00A

B_13 Electronic thermal 

characteristic

Select from two curves, option 
codes:
00 ...Reduced torque
01 ...Constant torque

✘

01

01

00

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E-THM CHAR   CRT