Delta MS300 Series User Manual page 578

ID Display on LCD Keypad
24_1
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
Motor shaft lock
The load is too large
Ambient temperature is too high
Motor cooling system error
Motor fan error
Operate at low-speed too long.
Accel./Decel. time and working
cycle are too short
V/F voltage is too high
Check if the motor rated current
matches that on the motor
nameplate.
Check if the PTC is properly set
and wired.
Check if the setting for stall
prevention is correct.
Unbalanced three-phase
impedance of the motor
Harmonics are too high.
Fault Name
Motor overheating
(oH3) PTC
Action and Reset
PTC input value > Pr.06-30 setting (Default = 50%)
Immediately act
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, oH3 is a "Warning". The "Warning" is automatically cleared.
When Pr.06-29 = 1 or 2, oH3 is a "Fault". You must reset manually.
Immediately reset
When Pr.06-29 = 1 or 2, oH3 is a "Fault", and the fault is recorded.
Remove the shaft lock.
Reduce the load.
Increase the motor capacity.
Change the installed place if there are heating devices in the surroundings.
Install/ add cooling fan or air conditioner to lower the ambient temperature.
Check the cooling system to make it work normally.
Replace the fan.
Decrease low-speed operation time.
Replace the motor with a dedicated to VFD model.
Increase the motor capacity.
Increase the setting values for Pr.01-12–01-19 (accel./decel. time)
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 low, the load capacity
decreases at low speed).
Reset to the correct motor rated current.
Check the connection between PTC thermistor and the heat protection.
Set the stall prevention to the proper value.
Replace the motor.
Use remedies to reduce harmonics.
569
Fault Descriptions
Motor overheating (PTC) (Pr.03-00–Pr.03-01 = 6 PTC),
when PTC input > Pr.06-30, the fault treatment acts
according to Pr.06-29.
Corrective Actions
Chapter 14 Fault CodesMS300