Operating Instructions

Warning Codes
Digital Keypad RT-KEYPAD
275 | 443
Reset method
When Pr.06-29=0, oH3 displays as Warning. When the temperature is ≦ Pr.06-30 level, the oH3
warning automatically clears.
Reset condition
When the temperature is ≦ Pr.06-30 level, the oH3 warning automatically clears.
Record
N/A
Cause
Corrective Actions
Motor locked
Clear the motor lock status.
The load is too large
Decrease the loading.
Replace with a motor with larger capacity.
Ambien temperature is too high
Change the installed place if there are heating devices in the surroundings.
Install/ add cooling fan or air conditioner to lower the ambient temperature.
Motor cooling system error
Check the cooling system to make it work normally.
Motor fan error
Replace the fan.
Operates at low-speed too long
Decrease low-speed operation time.
Change to dedicated motor for the drive.
Increase the motor capacity.
Accel./ Decel. time and working cycle is
too short
Increase setting values for Pr.01-12–01-19 (accel./ decel. time).
V/F voltage is too high
Adjust settings for Pr.01-01–01-08 (V/F curve), especially the setting value for the mid-point
voltage (if the mid-point voltage is set too small, the load capacity decreases at low-speed).
Check if the motor rated current matches
the motor nameplate
Configure the correct rated current value of the motor again.
Check if the PTC is properly set and wired
Check the connection between PTC thermistor and the heat protection.
Check if the setting for stall prevention is
correct
Set the stall prevention to the proper value.
Unbalanced three-phase impedance of
the motor
Replace the motor.
Harmonics is too high
Use remedies to reduce harmonics.
ID No.
Display on LCD Keypad
Warning Name
Description
22_2
Motor over-heating (oH3)
PT100
Motor overheating warning.
The AC motor drive detects the temperature inside the motor is too
high.
Action and Reset
Action level
Pr.03-00=11 (PT100), PT100 input level > Pr.06-57 (default=7 V)
Action time
Immediately act
Warning setting parameter
Error treatment: Pr.06-29
0: Warn and continue operation
1: Fault and ramp to stop
2: Fault and coast to stop
3: No warning
When Pr.06-29=0 and when the temperature is < Pr.06-56 level, the oH3 warning automatically
clears.
If the temperature is between Pr.06-56 and Pr.06-57, the frequency outputs according to the