YASKAWA VARISPEED-656RC5, Instruction Manual, Page: 45 / 66

46
6.2 MINOR FAULT DETECTION
An alarm is displayed on the LED monitor when the power generative unit detects
a minor fault. Power regenerative unit automatically returns to the original status
once the cause of the minor fault has been removed.
Take appropriate countermeasures according to the table below.
Table
16
Minor Fault Displays and Processing
LED Display
LED Display Probable Causes Corrective Actions
RUN DS1 DS2 Meaning
LED Display Probable Causes Corrective Actions
UV
Main Circuit Undervoltage
The following conditions oc-
curred during stop.
S
The main circuit DC voltage
was below the undervoltage
detection level.
S
The surge current limiting con-
tactor opened.
S
The control power supply is
below the undervoltage detec-
tion level.
S
Frequency detection exceeded
the allowable level.
S
Voltage phase rotation at the
input side changed.
Refer to the UV section of the
Fault Detection.
Refer to the UV section of the
Fault Detection.
ALARM
OV
Main Circuit Overvoltage
The main circuit DC voltage ex-
ceeded the overvoltage detection
level during stop.
200 V class : Approx. 400 VDC
400 V class : Approx. 800 VDC
The power supply voltage is
too high.
Decrease the voltage so it is
within specifications.
Heatsink Overheating
The temperature of the power re-
The ambient temperature is
too high.
Install a cooling unit.
OH
The temperature of the power re
generative unit heatsink exceed-
ed 90 % of the allowable level
There is a heat source nearby. Remove the heat source.
OH
ed 90 % of the allowable level.
The power regenerative unit
cooling fan has stopped.
Replace the cooling fan.
(Contact your Yaskawa repre-
sentative.)
OL
Power Regenerative Unit
Input Overload
The amount of the load
exceeded 80 % of the overload
capacity.
The load is too heavy. Reduce the load.
EF
External Fault
(Operation continues by the set-
ting of the digital operator.)
An external fault was input
from the contact input termi-
nal.
S
Reset the external fault from
the contact input terminal.
S
Correct the cause of the ex-
ternal fault.
: O N : B linking : O FF