YASKAWA Varispeed V7 - Corrective Actions of Models with Digital Operator

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 Corrective Actions of Models with Digital Operator
Alarm Displays and Meaning
Alarm Display Inverter
Status
Description Causes and Correc-
tive Actions
Digital
Operator
RUN (Green)
ALARM (Red)
Detected as
an alarm
only. Fault
contact out-
put is not ac-
tivated.
UV (Main circuit low volt-
age)
Main circuit DC voltage
dropped below the low-
voltage detection level
while the Inverter output
is OFF.
200 V:Main circuit DC
voltage drops be-
low approx. 200 V
(160 V for single-
phase)
400 V:Main circuit DC
voltage dropped
below approx.
400 V.
(Control supply fault)
Control power supply
fault is detected while
the Inverter output is
OFF.
Check the following:
• Power supply volt-
age
• Main circuit power
supply connection.
• Terminal screws:
Loose?
OV (Main circuit
overvoltage)
Main circuit DC voltage
exceeded the
overvoltage detection
level while the Inverter
output is OFF. Detection
level
200 V Class:
approx 410 V or more
400 V Class:
approx 820 V or more
Check the power supply
voltage.
OH (Heatsink overheat)
Intake air temperature in-
creased while the Invert-
er output is OFF.
Check the intake air tem-
perature.
: ON : Flashing : OFF
Flashing
Flashing
Flashing