Corrective Actions Of Models With Digital Operator - Omron VARISPEED V7 User Manual

Corrective Actions of Models with Digital Operator

: ON
Alarm Display
Alarm Display
Digital RUN (Green)
Operator ALARM (Red)
Flashing
Flashing
Flashing
Flashing
198
: Flashing
Alarm Displays and Meaning
Inverter
Status
Detected as UV (Main circuit low volt-
an alarm
age)
only. Fault
Main circuit DC voltage
contact out-
dropped below the low-volt-
put is not ac-
age detection level while the
tivated.
Inverter output is OFF.
200 V: Main circuit DC volt-
400 V: Main circuit DC volt-
(Control supply fault) Control
power supply fault is detected
while the Inverter output is
OFF.
OV (Main circuit over-
voltage)
Main circuit DC voltage ex-
ceeded the overvoltage de-
tection level while the Inverter
output is OFF.
Detection level:
200 V: approx. 410 V or more
400 V: approx. 820 V or more
OH (Heatsink overheat)
Intake air temperature in-
creased while the Inverter
output is OFF.
CAL (MEMOBUS com-
munications waiting)
Correct data has not been re-
ceived from the PLC when
the constants n003 (Run
Command Selection) is 2 or
n004 (Frequency Reference
Selection) is 6, and power is
turned ON.
: OFF
Description
age drops below ap-
prox. 200 V (160 V for
single-phase).
age dropped below
approx. 400 V.
Causes and
Corrective Actions
Check the following:
• Power supply voltage
• Main circuit power supply
connections
• Terminal screws: Loose?
• Monitor value
Confirm voltage (DC volt-
age) between terminals
"+1" and "-".
⇓
If there is no problem, the In-
verter may be faulty.
Check the following:
• Power supply voltage
• Monitor value
Confirm voltage (DC volt-
age) between terminals
"+1" and "-".
⇓
If there is no problem, the In-
verter may be faulty.
Check the following:
• Intake air temperature.
• There is no thermal
source around the
Inverter and oil stuck to
the fan has not lowered
the cooling capability.
• Fan is not clogged.
• No foreign matters, such
as water, is inside the
Inverter.
Check the following:
• Communications devices
and transmission signals.
• PLC is not faulty.
• Transmission cable is
connected properly.
• Wiring is made properly.
• Any loose terminal
screws do not result in
improper contact.