Omron RX2 Series User Manual page 764

12 Troubleshooting
E007 Overvoltage Error
Too high P-N voltage results in a failure. To prevent this, the inverter turns OFF its output. When P-N
voltage exceeds approx. 410 Vdc (200 V class) or approx. 820 Vdc (400 V class), the output is turned
OFF. By setting the parameter, you can perform retries for a fixed number of times without generating
an error.
Occurrence
Error occurred
during deceleration.
Error occurred
during operation.
Error occurred
during stop.
Error occurred
during drooping con-
trol
E008 Memory Error
If the built-in memory has problems, the inverter turns OFF its output. CPU error may be issued instead.
The inverter recovers by re-turning ON the power; however, you need to check that there is no problem
in parameters. The data which has been backed up on the operator keypad beforehand may be
restored.
Occurrence
Error occurred some
time after the power
was turned ON.
Power has been
unintentionally
turned OFF before.
12 - 10
Estimated cause(s)
Setting longer deceleration time in [FA-12] may improve the
• Insufficient decelera-
situation that the motor is rapidly decelerated. If deceleration
tion time
time cannot be shortened, you need to re-examine load condi-
tion, activate overvoltage suppression function, or use a brak-
• Load inertia is large.
ing resistor, braking unit, or regenerative converter.
If load inertia is large, high regenerative power returns from
the motor; hence an overvoltage is likely to occur. You need to
Load inertia is large. re-examine load condition, activate overvoltage suppression
function, or use a braking resistor, braking unit, or regenerative
converter.
An overvoltage is likely to occur if motor rotation speed
exceeds the output frequency (rotation speed) of inverter. You
Rotated by external force
need to re-examine load condition, activate overvoltage sup-
(fan, crane).
pression function, or use a braking resistor, braking unit, or
regenerative converter.
Power supply voltage may be raised or fluctuated. Re-exam-
Abnormality of PS volt-
ination of power supply environment or use of an AC reactor
age
may improve the situation.
When 2 motors driving a same shaft are controlled by 2 invert-
Mutual interference
ers, both the inverters attempt to generate torques, which may
caused by 2 inverters
result in control divergence. The situation may be improved by
trying to control motors
setting one of the inverters to P control. See 7-3-3 P/PI Switch-
strictly.
ing Function on page 7-46.
Estimated cause(s)
A physical countermeasure such as placing a shielding plate
Noise is mixed.
may be required to avoid external noises.
You need to restore the data by using the data which has been
backed up on the operator keypad beforehand. If the data can-
not be restored, initialization is required. See 6-1-2 Inverter Ini-
Power-off during mem-
tialization on page 6-5.
ory access
If the data cannot be restored by initialization, a repair is
required.
High-function General-purpose Inverter RX2 Series User's Manual
Exemplar measures to be taken
Exemplar measures to be taken