YASKAWA CIMR-G7U Technical Manual page 273

PTC Thermistor Characteristics
The following diagram shows the characteristics of the PTC thermistor temperature to the resistance value.
Resistance (ohms)
1330
550
Fig 6.40 PTC Thermistor Temperature-Resistance Value Characteristics
Operation during Motor Overheating
Set the operation if the motor overheats in parameters L1-03 and L1-04. Set the motor temperature input filter
time parameter in L1-05. If the motor overheats, the OH3 and OH4 error codes will be displayed on the Digi-
tal Operator.
Error Codes If the Motor Overheats
Error Code
OH3 Drive stops or continues to operate, according to the setting in L1-03.
OH4 Drive stops according to the setting in L1-04.
By setting H3-09 (Multi-function Analog Input Terminal A2 Function Selection) or H3-05 (Multi-function
Analog Input Terminal A3 Function Selection) to E (Motor temperature input), you can detect alarm OH3 or
OH4 using the PTC temperature-resistance characteristics, and protect the motor. The terminal connections
are shown in the following diagram.
Class H
Class F
180C
150C
Tr: Temperature threshold value
Temperature
Tr Tr+5
Details
Machine Protection
6-
55