Delta VFD2A8MS21ANSAA User Manual

Chapter 14 Fault CodesMS300
566
ID
Display on LCD Keypad
Fault Name
Fault Descriptions
21
Over load
(oL)
The AC motor drive detects excessive drive output
current.
Overload capacity:
 Normal duty:
Sustains for one minute when the drive outputs
120% of the drive’s rated output current.
Sustains for three seconds when the drive outputs
150% of the drive’s rated output current.
 Heavy duty:
Sustains for one minute when the drive outputs
150% of the drive’s rated output current.
Sustains for three seconds when the drive outputs
200% of the drive’s rated output current.
Action and Reset
Action Condition
Based on overload curve and derating curve (refer to Section 9-7).
Action Time
When the load is higher than the protection level and exceeds allowable time,
the oL protection activates.
Fault Treatment Parameter
N/A
Reset Method
Manual reset
Reset Condition
Reset in five seconds after the fault is cleared
Record
Yes
Cause
Corrective Actions
The load is too large
Reduce the load
Accel./Decel. time or the working
cycle are too short
Increase the setting value for Pr.01-12–01-19 (accel./decel. time)
V/F voltage is too high
Adjust the 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).
Refer to the V/F curve selection of Pr.01-43.
The capacity of the drive is too
small
Replace the drive with a larger capacity model.
Overload during low-speed
operation
Reduce the load during low-speed operation.
Increase the drive capacity.
Decrease the carrier frequency of Pr.00-17.
Torque compensation is too large
Adjust the torque compensation (refer to Pr.07-26 Torque Compensation Gain)
until the output current reduces and the motor does not stall.
Check if the setting for stall
prevention is correct.
Set the stall prevention to the proper value.
Output phase loss
Check the status of three-phase motor.
Check if the cable is broken or the screws are loose.
Improper parameter settings for
the speed tracking function
(including restart after momentary
power loss and restart after fault)
Correct the parameter settings for speed tracking.
1. Start the speed tracking function.
2. Adjust the maximum current for Pr.07-09 speed tracking.

Delta VFD2A8MS21ANSAA Specifications

General

Brand	Delta
Model	VFD2A8MS21ANSAA
Category	DC Drives
Language	English