Thermistor Thermal Protection - Hitachi L2002 Instruction Manual

Thermistor Thermal Protection

Motors that are equipped with a PTC thermistor can be protected from overheating.
Input terminal [5] has the unique ability to sense a thermistor resistance. When the resis-
tance value of the thermistor connected to terminal [PTC] at [5] and [L] is more than
3 k Ω ±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 Terminal
Code Symbol
19 PTC Thermistor Thermal
Protection
C005 only
Valid for inputs:
C085
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.
Input
Function Name
State
Sensor When a thermistor is connected to terminals [5]
Open
L200
Description
and [L], the inverter checks for over-temperature
and will cause trip (E35) and turn OFF the
output to the motor
An open circuit in the thermistor causes a trip,
and the inverter turns OFF the output
Example (requires input configuration—
see page 3–47):
PTC
L 5 4
thermistor
MOTOR
4–25
Inverter
2
3 2 1 PCS