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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 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 Defaults
Func.
Code
Name /
SRW Display
Description
Run
Mode
Edit
-FE
(EU)
-FU
(USA)
Units
Level of electronic thermal
setting
B012
E-THM LVL 001.60A
Set a level between 20% and
100% for the rated inverter
current.
U
A
Level of electronic thermal
setting, 2nd motor
B212
2ETHM LVL 001.60A
Set a level between 20% and
100% for the rated inverter
current.
U
Rated
current for
each inverter
model *1
A
Electronic thermal
characteristic
B013
E-THM CHAR CRT
Select from three curves, option
codes:
00…Reduced torque 1
01…Constant torque
02…Reduced torque 2
U
01 01
−
Electronic thermal
characteristic, 2nd motor
B213
2ETHM CHAR CRT
Select from three curves, option
codes:
00…Reduced torque 1
01…Constant torque
02…Reduced torque 2
U
01 01
−
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.
Torque
100%
12060205
80%
60%
0
Hz
Constant torque
Reduced
torque
B013 = 01
B013 = 00
Output frequency
3−34
Configuring Drive
Parameters