Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 118)

Preventive Maintenance and
Troubleshooting Common Drive Problems
Appendix B
B-11
2. The motor will not run continuously --
OL
is displayed.
Is the load current equal to the motor nameplate rating? Is the load current
within the rated current of the
drive?
An OL trip occurs when the load current is greater than 140% for one minute.
Lighten the load or resize the drive and motor to meet your application.
No
Is Parameter 6 set to 1, 2 or 3?
Yes
When set to 1, 2 or 3, the thermal overload function is enabled. Check for the
correct setting as detailed in Chapter 5.
No
Yes
Yes
No
Is Parameter 7 set to the rated motor nameplate value? An OL trip occurs when the load current is greater than 125% of the overload
current value set in Parameter 7 for one minute. Lighten the load or resize the
drive and motor to meet your application.
Set Parameter 7 to the rated motor nameplate value.
2. The motor will not run continuously --
OU
is displayed.
Is the incoming AC power line high? Monitor and correct the AC line.
No
Yes
No
Is an overhauling load present -- Does the load increase the motor speed
beyond the drive set speed?
Yes
Is the deceleration time too short? Is Parameter 18, the Decel Frequency
Hold off?
Increase the value of Decel Time 1 Parameter 2, or set Parameter 18 Decel
Frequency Hold on.
Yes
Increase the value of Parameter 14 DC Hold Volts. Install the Heavy Duty
Dynamic Brake Option. Does the problem still exist?
No
Contact your nearest AĆB representative for application assistance.
Yes