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5-9 Functions Relating to Protections, Warnings and Various Output Signals
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
5-9 Functions Relating to Protections,
Warnings and Various Output Signals
The following explains the protective functions such as warning signals.
Electronic Thermal Function
This function calculates the rise in motor temperature in the Inverter based on the output current,
output frequency, motor characteristics and other data, to protect the motor against overheating.
Provides the most appropriate protection characteristics, taking into account the decline of the
motor cooling capability at a low speed.
Outputs an alarm before the electronic thermal trips.
The time limit characteristics of the electronic thermal vary depending on the setting of Heavy
Load/Light Load Selection (b049).
Electronic Thermal Level
Electronic Thermal Characteristics
Although only one type of electronic thermal characteristic curve is available each for heavy load and light load,
the frequency characteristics can be switched by Electronic Thermal Characteristics Selection (b013/b213).
A standard motor requires reduced load (current) because the lower the motor rotation speed
is, the lower the cooling capacity of its self-cooling fan gets. When the frequency drops, the
reduction multiple also decreases and the thermal level (current) drops, as well.
The reduced torque characteristics depend on the heat radiation of a standard motor.
Parameter
No.
Function name Data range
Default
setting
Unit
b012/b212 Electronic Thermal Level 1/2
0.20 × Rated current to
1.00 × Rated current
Inverter
rated
current
A
Example 1) Heavy load setting Example 2) Light load setting
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