Hitachi CONVENTION 14 Instruction Manual page 173

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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
indicates the trip status E35. Use this function to protect the motor from overheating.
Option Terminal
Code Symbol
19 TH
Valid for inputs:
Required settings
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.
NOTE: The trip level is hardware wise fixed and cannot be changed.
±10%, the inverter enters the Trip Mode, turns OFF the output to the motor, and
Function Name
Thermistor Thermal
Protection
C005 only
(none)
State
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
Example (requires input configuration—
see page 3–49):
TH
5 4
Description
3 2 1 L PCS P24
Motor
thermistor