L100 Inverter
Troubleshooting
and Maintenance
6–5

Monitoring Trip Events, History, & Conditions

Inverter Fault Detection
The microprocessor in the inverter detects a variety
of fault conditions and latches the event, recording
it in a history table. The inverter output turns off, or
“trips” similar to the way a circuit breaker trips due
to an over-current condition. Most faults occur
when the motor is running (refer to the diagram to
the right). However, the inverter could have an
internal fault and trip in Stop Mode. In either case,
you can clear the fault by pressing the Stop/Reset key.
We recommend that you first find the cause of the fault before clearing it. When a fault
occurs, the inverter stores important performance data at the moment of the fault. To
access the data, use the monitor functions (Dxx) and select D08 for details about the
present fault (En), or the error code for the past two trip events (En-1 and En-2) using the
D09 Trip History function. A listing of error codes is on the next page.
Run Stop
RUN
RUNRUN
RUN
STOP
STOPSTOP
STOP
RESET
Trip
Fault STOP
STOPSTOP
STOP
RESET
Fault
___
Monitor Menu
09D
2
1

08D

205

9881

0E9

010

Error Code Previous
error #1
FUNC.
FUNC.
FUNC.
01D
FUNC.
FUNC.
FUNC.
Error
exists?
Output frequency
at trip point
Motor current
at trip point
DC bus voltage
at trip point
No error
Yes
No
FUNC.
Error(n-1)
exists?
Yes
No

0E3

Error(n-2)
exists?
Yes

0E5

___
___
No
Previous
error #2
FUNC.
No
history
No
history
FUNC.
FUNC.
FUNC.
Trip Hi sto ry
Current Trip
2
1
2
2
Conditions
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com