Hitachi X200 Series Electronic Thermal Overload Alarm Setting, Thm Lvl, 2ETHM LVL, THM Char CRT

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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.

Torque	Constant torque B013 = 01
100%
80%	Reduced
60%	torque
	B013 = 00
0	Hz

Configuring Drive Parameters

The torque developed in a motor is directly		5 20	60	120
proportional to the current in	the windings,	Output frequency
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 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.