L100 Inverter
Operations
and Monitoring
4–17

PTC 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 voltage. When the resistance value
of the thermistor connected to terminal [PTC] (5) and [L] is more than 3k Ohms ± 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 Input
State Description
19 PTC PTC Thermistor
Thermal Protection ANLG When a thermistor is connected to terminals 5
and L, the inverter checks for over-temperature
and will cause trip event and turn off output to
motor
OPEN A disconnect of the thermistor causes a trip
event, and the inverter turns off the motor
Valid for inputs: C05 only
Required settings: (none)
Notes:
•This function is assigned to the input terminal 5
only. If this function is assigned without connection
the thermistor, the inverter automatically enters the
Trip Mode. Be sure the thermistor is connected to
terminals 5 and L, and then restart.
Example:
PTC
MOTOR
thermistor
P24
123L 45
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com