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Thermistor Thermal Protection
Motors that are equipped with a thermistor can be protected from overheating. Input
terminal [5] has the unique ability to sense a thermistor resistance. When the
resistance value of the thermistor connected to terminal [TH](5) and [L] is more than
3 k ±10%, the inverter enters the Trip Mode, turns OFF the output to the motor, and
indicates the trip status E35. Use this function to protect the motor from overheating.
Option
Code
Terminal
Symbol
Function Name State Description
ON When a thermistor is connected to terminals [5]
and [L], the inverter checks for over-temperature
and will cause trip (E35) and turn OFF the output
to the motor
19 TH Thermistor Thermal
Protection
OFF An open circuit in the thermistor causes a trip,
and the inverter turns OFF the output
Valid for inputs: C005 only
Required settings (none)
Notes:
x Be sure the thermistor is connected to terminals
[5] and [L]. If the resistance is above the
threshold the inverter will trip. When the motor
cools down enough, the thermistor resistance
will change enough to permit you to clear the
error. Press the STOP/Reset key to clear the
error.
Example (requires input configuration—
see page 3–49):
NOTE: The trip level is hardware wise fixed and cannot be changed.
4 3 2 1 L
PCS
P24
TH
thermistor
Moto
r
5
424
Operations and
Monitoring
4 24
Operations and
Monitoring