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7 Detailed Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
7-4 Detailed Functions (Group b)
7
Select whether to enable the inverter’s built-in cooling fan constantly or only during inverter operation.
If a power interruption or power shutoff occurs when the cooling fan is operating, the cooling fan
will stop temporarily and, when the power supply is restored, restart automatically.
• You can provide thermal protection for external equipment such as a motor by connecting the
thermistor installed on it to the inverter.
• To do so, set the following functions according to the specifications of the thermistor.
• Setting the Thermistor Selection (b098) to 01 or 02 (Enable) when the inverter is not
connected to any external thermistor causes a trip.
• Connect an external thermistor between the control terminals TH and SC.
• To use this function, keep the wiring distance between the motor and the inverter at 20 m or
shorter. Since the current flowing through the thermistor is weak, take measures, such as
isolating the thermistor cable, to prevent noise due to the motor current.
Cooling Fan Control
Parameter No. Function name Data Default data Unit
b092 Cooling Fan Operation
00: Always enabled
01: Enabled only during RUN
(Operates for 5 minutes after
power on and after stop.)
01 –
External Thermistor (TH)
Parameter No. Function name Data Default data Unit
b098 Thermistor Selection
00: Disabled
01: PTC enabled (Positive
temperature coefficient resistor
element)
02: NTC enabled (Negative
temperature coefficient resistor
element)
00 –
b099 Thermistor Error Level 0. to 9999. 3000. O
C085 Thermistor Adjustment
0.0 to 999.9
1000.
Factory setting –
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