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
. Use this function to protect the motor from overheating.
Option
Code
Terminal
Symbol
Function Name
State
Description
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 (
) 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:
only
Example (requires input configuration
—
see
page 3-85
):
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
7
6
5
4
3
2
1
L
PLC
P24
Thermistor
Summary of Contents for WJ200-001L
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