Event code Event name Description Assumed cause
Level
Reference
Min Obs Info
087F0000 hex Undervoltage The DC link bus volt-
age dropped below
the undervoltage de-
tection level.
(1) A momentary power inter-
ruption occurred.
√
page
A-238
(2) The inverter’s power sup-
ply voltage is not within the
specified range.
(3) There is a faulty device or
incorrect wiring in the power
circuit.
(4) Power supply voltage tem-
porary drops due to a large
starting current flowing to an-
other load connected to the
same power supply system.
(5) Power supply voltage
drops due to the inrush current
of the inverter caused by insuf-
ficient power transformer ca-
pacity.
280F0000 hex
Input Phase
Loss Error
There is an input
phase loss, or the
power supply has a
large phase-to-phase
imbalance.
(1) Wiring to the main power
supply input terminals is dis-
connected.
√
page
A-239
(2) The main power input ter-
minal is not firmly tightened.
(3) The 3-phase power supply
has a large phase-to-phase
imbalance.
(4) An excessive load is peri-
odically applied.
(5) A single-phase power sup-
ply was connected to the prod-
uct requiring a 3-phase power
supply
.
28100000 hex
Output
Phase Loss
Error
There is an output
phase loss.
(1) The inverter’s output wiring
is disconnected.
√
page
A-240
(2) The motor winding is bro-
ken.
(3) The inverter output termi-
nals are not firmly tightened.
Appendices
A-209
M1 Series EtherCAT Type User’s Manual (I670)
A-5 Sysmac Error Status Codes
A
A-5-1 Error List
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