Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(0S)
Excessive
speed protec-
tion
(1) Error in parameter
settings
Check 1st Motor Pole Number (P01*).
→ Set P01* to match the motor used.
Check 1st Maximum Output Frequency
(F03*) settings.
→ Set F03* to match the output frequency.
Check Speed Limit 1 in Forward (d32) and
Speed Limit 2 in Reverse (d33) settings.
→ Disable Speed Limit 1 in Forward (d32)
and Speed Limit 2 in Reverse (d33).
Check Over Speed Detection Level (d35)
settings.
→ Set Over Speed Detection Level (d35)
to 120%.
(2) Insufficient speed
regulator gain
Check that the speed does not overshoot
during high-speed running.
→ Increase the Speed Control 1 P Propor-
tional Gain (d03*).
(In some cases, a review of filters and
integral time will be necessary
.)
(3) Noise superimposed
on the PG signal
Check the PG signal input monitor, and
check measures against noise (grounding
conditions, signal wiring/main circuit wiring
and installation methods, etc.).
→
Implement measures against noise.
(4) Output frequency
and motor rotation
speed exceeded 599
Hz
If using at near 590Hz, check that the accel-
eration time is not short, there is no load var-
iation, and that the speed regulator Speed
Control 1 P Proportional Gain (d03*) and
Speed Control 1 I Integral T
ime (d04*) are
appropriate.
→
Decrease the run frequency
.
(0Un)
Overvoltage
(1) The power supply
voltage exceeds the in-
verter specification
range (three-phase 200
V and single-phase 200
V: 420 VDC/three-
phase 400 V: 840 VDC)
Measure the input voltage.
→
Decrease the power supply voltage to
within the specified range.
→ If the power supply voltage is within the
specification range, this indicates an in-
verter fault. Please contact OMRON.
(2) Surge in the input
power supply
When a phase advance capacitor is turned
ON/OFF or a thyristor converter operates on
the same power supply system, a transient
abnormal surge may occur in input voltage.
→ Set a DC reactor.
9 Troubleshooting
9-22
M1 Series Standard Type User's Manual (I669)
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