Omron SYSDRIVE RV Series User Manual page 274

PTC Thermistor Characteristics
The following diagram shows the characteristics of the PTC thermistor temperature to the resistance value.
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 constant in L1-05. If the motor overheats, the OH3 and OH4 error codes will be displayed on the Digital
Operator.
Error Codes If the Motor Overheats
Error Code
OH3
OH4
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. Set H3-08 〔 Signal level selection (terminal A2)〕 (H3-04 when A3 is used)
to 0 (0 to + 10 V).
-66
6
Resistance (ohms)
1330
550
Tr 5
Fig 6.41 PTC Thermistor Temperature-Resistance Value Characteristics
Inverter stops or continues to operate, according to the setting in L1-03.
Inverter stops according to the setting in L1-04.
Multi-function
contact input
Branch resistance
18 kΩ
PTC thermistor
* When using terminal A2, set DIP switch S1-2 to OFF (0 to 10 V).
Fig 6.42 Mutual Connections During Motor Overheating Protection
Class H
Class F
180°C
150°C
Tr: Temperature threshold value
Temperature
Tr
Tr Tr+5
Details
Inverter
A2, A3
(0-10 V) *
Multi-function
contact output
Fault contact
output
Multi-function
PHC output