5.3 Description of Function Codes 5.3.5 H codes (High performance functions)
Thermistor (for motor) (Operation selection)
Thermistor (for motor) (Operation level)
These function codes specify the PTC (Positive Temperature Coefficient) thermistor embedded in the motor. The
thermistor is used to protect the motor from overheating or output an alarm signal. If switching the motor, set the A,
b, or r function code corresponding to the motor to be selected.
Thermistor (Operation selection) (H26 (A66, b66, r66))
H26 selects the function operation mode (protection or alarm) for the PTC thermistor as shown below.
Disable (H26 factory default)
When the voltage sensed by PTC thermistor exceeds the detection level, motor
protective function (alarm OH4) is triggered, causing the inverter to enter an alarm
stop state.
When the voltage sensed by the PTC thermistor exceeds the detection level, a
motor alarm signal is output but the inverter continues running.
You need to assign the “Motor overheat detected by thermistor” signal (“THM”) to
one of the digital output terminals beforehand, by which a temperature alarm
condition is indicated to the peripheral equipment (E20 to E24 and E27, data = 56).
Set if connecting the NTC thermistor built into dedicated Fuji motors for vector
control (VG motor).
This is used to detect the motor temperature and for control.
Furthermore, motor protection (alarm OH4) is triggered when the motor overheats
and exceeds the protection level, and the inverter stops due to the alarm.
Based on H26 (factory default)
If the PTC thermistor is selected by setting H26 to 1 or 2, the PTC thermistor
detection voltage is also monitored when motor 2 to 4 is selected to provide
protection.
When the NTC thermistor (H26 = 3) is selected, only motor 1 runs, and motors 2 to
4 are disabled.
If using a thermistor for motor 2 to 4, operation function codes should be set individually for motor 2 (A66), motor 3
(b66), and motor 4 (r66). However, operation will be as follows if the A66, b66, and r66 factory defaults (data 100:
based on H26) are set.
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