Hitachi WJ200 Series

4−30
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 [PTC] (5) and [L] is more than
3 kΩ ±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
19
PTC Thermistor Thermal
Protection
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
OFF An open circuit in the thermistor causes a trip, and
the inverter turns OFF the output
Valid for inputs:
C005 only
Example (requires input configuration—
see page 3–84):
Required settings
(none)
Notes:
• 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.
PTC
7654321L
PCS
P24
Thermistor
PLC