Event name Undervoltage Event code 087F0000 hex
Meaning The DC link bus voltage dropped below the undervoltage detection level.
Source EtherCAT Master Function Mod-
ule
Source details Slave Detection tim-
ing
Continuously
Error attrib-
utes
Level Minor fault Recovery Error reset Log category System log
Effects User program Continues. Operation Motor stops.
Indicators EtherCAT NET RUN EtherCAT NET ERR EtherCAT LINK/ACT
--- --- ---
System-de-
fined varia-
bles
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
(1) A momentary power interrup-
tion occurred.
Reset the alarm.
T
o restart the inverter without
alarm, set the value of
Power
Interruption Restart Mode
selection (3004-0F hex) to 3, 4,
or 5 depending on the type of
load.
Remove the cause of the mo-
mentary voltage drop.
(2) The inverter’s power supply
voltage is not within the specified
range.
Measure the input voltage.
→ Increase the power supply
voltage to within the specified
range.
Apply a voltage that is appropri-
ate for the inverter.
(3) There is a faulty device or in-
correct wiring in the power cir-
cuit.
Measure the input voltage to
identify the faulty device or incor-
rect wiring.
→ Replace the faulty device, or
correct the incorrect wiring.
Check the wiring of the main cir-
cuit power supply before use.
(4) Power supply voltage tempo-
rary drops due to a large starting
current flowing to another load
connected to the same power
supply system.
Measure the input voltage to
check for voltage fluctuations.
→ Review the power supply sys-
tem.
Apply a voltage that is appropri-
ate for the inverter.
(5) Power supply voltage drops
due to the inrush current of the
inverter caused by insufficient
power transformer capacity
.
Check if an alarm occurs when
the molded case circuit breaker,
earth leakage circuit breaker
(with overcurrent protection), or
electromagnetic contactor is
turned ON.
→ Review the power transformer
capacity.
Select a power transformer with
a capacity appropriate for the in-
verter.
Attached in-
formation
None
Precautions/
Remarks
None
Appendices
A-238
M1 Series EtherCAT Type User’s Manual (I670)
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