Delta MH300 Series - Page 670

Chapter 13 Warning Codes|MH300
13-21
ID No. Display Warning Name Description
22_1
Motor over-heating
(oH3) PTC
Motor overheating warning.
The AC motor drive detects the temperature inside
the motor is too high
Action and Reset
Action level
Pr.03-00=6 (PTC), PTC input level > Pr.06-30 PTC level (default=50%)
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.06-30
level, the oH3
warning automatically clears.
When Pr.06-29=0 (“Warning”), it automatically resets.
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 c
urve), 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.