Omron SYSDRIVE 3G3MV A2002, User Manual

Page: 261 / 348

8-8
Fault
display
Probable cause and remedy Fault name and
meaning
ce
Communications
time-over (CE)
Normal RS-422/485
communications were
not established within
2 s. The Inverter will
detect this error if n151
for RS-422/485
communications time
over detection selection
is set to 0, 1, or 2.
·
A short-circuit, ground fault, or disconnection has
occurred on the communications line.
®
Check and correct the line.
·
The termination resistance setting is incorrect.
®
In the case of RS-422 communications, set pin
1 of SW2 of all Inverters to ON. In the case of
RS-485 communications, set pin 1 of SW2 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.
·
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.
Emergency stop (STP)
An emergency stop
alarm is input to a
multi-function input. (A
multi-function input from
1 to 7 that was set to 19
or 21 has operated.)
·
An emergency stop alarm is input.
®
Remove the cause of the fault.
·
The sequence is incorrect.
®
Check and change the external fault input
sequence including the input timing and NO or
NC contact.
OFF Power supply error
Control power supply voltage
is insufficient.
·
No power supply is provided.
®
Check and correct the power supply wire and voltage.
·
Terminal screws are loose.
®
Check and tighten the terminal screws.
·
Operator connectors are faulty.
®
If only the Operator indicator is not lit, (i.e., if the RUN
and ALARM indicators are lit), check and correct the
Operator’s connectors.
·
The Inverter is damaged.
®
Replace the Inverter.
Maintenance Operations Chapter 8