6
-36
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
By setting H3-09 (Multi-function Analog Input Terminal A2 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.
Fig 6.28 Mutual Connections for Motor Overheating Protection
Setting Precautions
•
When inputting a voltage signal to terminal A2, pin 2 of the DIP-switch S1 on the control terminal board
has to be turned to OFF (A2 voltage input). The factory setting is ON (A2 current input).
•
The parameter H3-08 (analog input terminal A2 signal level) has to be set to 0 (0-10V input).
Error Code
Details
OH3
Inverter stops or continues to operate, according to the setting in L1-03.
OH4
Inverter stops according to the setting in L1-04.
Inverter
Multi-function
contact input
Branch resistance
18 k
Ω
*1
PTC thermistor
Multi-function
contact output
Fault contact
output
Multi-function
PHC output
*1
The resistance value of 18 k
Ω
is only valid for using a 3-phase PTC with the characteristic
shown on the previous page.
