
7
-4
UV1
DC Bus
Undervolt
Main Circuit Undervoltage
The main circuit DC voltage is
below the Undervoltage Detection
Level (L2-05).
200 V Class: Approx. 190 V
400 V Class: Approx. 380 V
Main Circuit Magnetic Connector
Operation Failure
The magnetic connector stopped
responding during Inverter opera-
tion.
Applicable Inverter Capacities
200 V Class: 30 to 110 kW
400 V Class: 55 to 300 kW
• An open-phase occurred with the
input power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• A fault occurred in the surge preven-
tion circuit.
• The magnetic contactor in the control
circuit was released (Contact failure
in the auxiliary contact).
• The contact of the magnetic contactor
in the control circuit was corroded
due to environmental dust or gas.
• A fuse on the Change Power Tap Cir-
cuit Board has blown for a 400 V
Class Inverter of 55 kW or higher.
• Reset the fault after correcting
its cause.
• Improve the power supply envi-
ronment. (Check to see if the
correct power tap is selected.)
• Improve the operating environ-
ment.
• Replace the Inverter.
UV2
CTL PS
Undervolt
Control Power Fault
The control power supply voltage
dropped.
• The wiring of the control power cir-
cuit is incorrect.
• A Backup Capacitor Unit for
Momentary Power Loss is not
attached to a 200 V/400 V Class
Inverter of 7.5 kW or less and the
value of the Momentary power loss
ridethru time (L2-02) factory setting
has been changed to the larger value.
• Try turning the power supply off
and on.
• Replace the Inverter if the fault
continues to occur.
• Attach a Backup Capacitor Unit
for Momentary Power Loss.
UV3
MC
Answer-
back
Inrush Prevention Circuit Fault
A fault occurred in the surge pre-
vention circuit.
The magnetic contactor did not
respond for 10 s even though the
magnetic contactor ON signal has
been output.
• The magnetic contactor in the main
circuit failed.
• The magnetic contactor excitation
coil is burned out.
• Try turning the power supply off
and on.
• Replace the Inverter if the fault
continues to occur.
PF
Input Pha
Loss
Main Circuit Voltage Fault
The main circuit DC voltage oscil-
lates unusually (not when regener-
ating).
This fault is detected if a load is
greater than approximately 80% of
the maximum motor capacity.
This fault is detected when L8-05 is
set to 1.
• An open-phase occurred in the input
power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• The voltage balance between phases
is bad.
Reset the fault after correcting its
cause.
Table 7.1 Fault Displays and Processing (Continued)
Display
Meaning
Probable Causes
Corrective Actions
Power tap
CHARGE indicator
Operating power supply
input terminals
200 V Class power supply
Jumper
(default position)
400 V Class power supply
TOE-S616-60.1.book 4 ページ 2017年8月4日 金曜日 午後3時41分