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6 Basic Parameter Settings
High-function General-purpose Inverter RX2 Series User’s Manual
6-6 Thermal Protection of Motor (Electronic Thermal)
6
6-6-2 Monitoring of Motor Temperature
The temperature protection of an external device can be made by connecting a thermistor installed in
the motor or other external device to the inverter and setting the function of the thermistor.
The external thermistor should be wired between the control terminals TH+ and TH-.
Set the thermistor selection [Cb-40] and the resistance value at error occurrence [bb-70] in accordance
with the thermistor’s specifications.
[E035] thermistor error occurs when the thermistor resistance reaches the thermistor error level [bb-70]
depending on the motor temperature.
When [Cb-40] is set to 02, [dA-38] motor temperature monitor indicates the detected temperature of the
motor.
Precautions for Correct Use
• When an external thermistor is not connected, a trip occurs if the thermistor selection [Cb-40]
is set to 01.
• To use this function, the wiring distance between the motor and the inverter has to be 20 m or
shorter. Since the current flowing in the thermistor is very weak, a measure such as wiring
separation should be taken to prevent noise from the motor current.
• When [Cb-40] is set to a value other than 02, [dA-38] motor temperature monitor indicates 0
°C.
Parameter
6-6-2 Monitoring of Motor Temperature
Item
Parameters
Data Description
Default
data
Thermistor error level [bb-70]
0 to
10000.(Ω)
Set the resistance for the temperature at which
a trip occurs in accordance with the thermistor
resistance specifications.
Effective when [Cb-40]=01, 02
3000
Thermistor selection [Cb-40]
00 Disabled
00
01
Enabled Positive temperature coefficient resis-
tor (PTC)
02
Enabled Negative temperature coefficient resis-
tor (NTC)
Thermistor gain
adjustment
[Cb-41] 0.0 to 1000. Use as gain adjustment. 100.0
Motor temperature
monitor
[dA-38]
-20.0 to
200.0(C°)
Indicates the detected motor temperature. -
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