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Electronic Thermal Overload Alarm Setting

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 B013 to select the torque characteristic 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 related to the heat generated (and temperature, over time).

Torque

Constant torque

B013 = 01

100%

 

 

 

 

 

80%

 

 

 

 

 

60%

 

 

 

Reduced

 

 

 

 

 

 

Reduced

 

torque2

 

 

torque1

 

B013 = 02

0

B013 = 00

 

 

Hz

 

 

 

 

5

20

60

 

120

 

 

Output frequency

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Parameters

Parameters

 

Drive

 

 

Configuring

 

 

 

 

Therefore, you must set the thermal overload threshold in terms of current (amperes) for parameter B012. The range is 20% 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. Separate settings are available for the second motor (if applicable) as shown in the following table.

 

 

 

“B” Function

 

Run

Defaults

Func.

Name /

 

 

Description

Mode -FE -FU

Units

Code

SRW Display

 

Edit (EU)

 

(USA)

 

 

B012

Level of electronic thermal

Set a level between 20% and

 

Rated

A

 

 

setting

 

100% for the rated inverter

 

current for

 

 

 

E-THM LVL

001.60A

current.

 

each inverter

 

B212

Level of electronic thermal

Set a level between 20% and

 

model *1

A

 

 

setting, 2nd motor

 

100% for the rated inverter

 

 

 

 

 

 

 

 

 

current.

 

 

 

 

 

 

 

2ETHM LVL

001.60A

 

 

 

 

 

B013

Electronic thermal

Select from three curves, option

 

01

 

01



 

 

characteristic

 

codes:

 

 

 

 

 

 

 

 

 

00

Reduced torque 1

 

 

 

 

 

 

 

 

 

01

Constant torque

 

 

 

 

 

 

 

E-THM CHAR

CRT

 

 

 

 

 

 

 

02

Reduced torque 2

 

 

 

 

 

B213

Electronic thermal

Select from three curves, option

 

01

 

01



 

 

characteristic, 2nd motor

codes:

 

 

 

 

 

 

 

 

 

00

Reduced torque 1

 

 

 

 

 

 

 

 

 

01

Constant torque

 

 

 

 

 

 

 

2ETHM CHAR

CRT

02

Reduced torque 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WARNING: When parameter B012, level of electronic thermal setting, is set to motor FLA rating (Full Load Ampere nameplate rating), the inverter provides solid state motor overload protection at 115% of motor FLA or equivalent. If parameter B012 exceeds the motor FLA rating, the motor may overheat and be damaged. Parameter B012, level of electronic thermal setting, is a variable parameter.

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Hitachi CP-X200 instruction manual Electronic Thermal Overload Alarm Setting, Thm Lvl, 2ETHM LVL, 2ETHM Char CRT
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