User Manual
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
of
f?
Increase
the value of Decel T
ime 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 AB representative for application assistance.
Yes