Omron SYSDRIVE 3G3JV Setup Manual page 68

Maintenance Operations
Fault display Warning name and Meaning
Communications time-over (CE)
Normal RS-422A/485 communications
were not established within 2 s. The
Inverter will detect this error if n68
(RS-422A/485 communications
time-over detection selection) is set to
0, 1, or 2.
Operation error (OPj)
(flashing)
(Parameter setting error)
(flashing)
(flashing)
(flashing)
(flashing)
Probable cause and remedy
• A short-circuit, ground fault, or disconnection has
occurred on the communications line.
→ Check and correct the line.
• The termination resistance setting is incorrect.
→ Set the termination resistance of only the
Inverter located at each end of the network to
ON.
• Noise influence.
→ Do not wire the communications line along
with power lines in the same conduit.
→ Use the twisted-pair shielded wire for the
communications line, and ground it at the
Master.
• Master's program error.
→ Check and correct the program so that
communications will be performed more than
once every 2-s period.
• Communications circuit damage.
→ If the same error is detected as a result of a
self-diagnostic test, change the Inverter.
• The values in n36 through n39 for multi-function
inputs 1 through 4 have been duplicated.
→ Check and correct the values.
• The V/f pattern settings do not satisfy the follow-
ing condition.
n14 x n12 t n11x n09
→ Check and correct the set value.
• The rated motor current set in n32 exceeds
150% of the rated output current of the Inverter.
→ Check and correct the value.
• The frequency reference upper limit set in n30
and the frequency reference lower limit set in n31
do not satisfy the following condition.
n30 y n31
→ Check and correct the set values.
• The jump frequencies set n49, n50 do not satisfy
the following condition.
n49 y n50
→ Check and correct the set values.
Chapter 4
4-9