Minor Fault Detection - YASKAWA VARISPEED-656RC5 Instruction Manual

6.2

MINOR FAULT DETECTION

Table 16
LED Display
RUN DS1 DS2
46
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.
Minor Fault Displays and Processing
LED Display LED Display
Meaning
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-
UV 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.
Main Circuit Overvoltage
The main circuit DC voltage ex-
ceeded the overvoltage detection
OV
ALARM
level during stop.
200 V class : Approx. 400 VDC
400 V class : Approx. 800 VDC
Heatsink Overheating
The temperature of the power re The temperature of the power re-
generative unit heatsink exceed-
OH OH
ed 90 % of the allowable level ed 90 % of the allowable level.
Power Regenerative Unit
Input Overload
OL
The amount of the load
exceeded 80 % of the overload
capacity.
External Fault
(Operation continues by the set-
EF
ting of the digital operator.)
: ON : Blinking
Probable Causes Probable Causes
Refer to the UV section of the
Fault Detection.
The power supply voltage is
too high.
The ambient temperature is
too high.
There is a heat source nearby.
The power regenerative unit
cooling fan has stopped.
The load is too heavy.
An external fault was input
from the contact input termi-
nal.
: OFF
Corrective Actions Corrective Actions
Refer to the UV section of the
Fault Detection.
Decrease the voltage so it is
within specifications.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan.
(Contact your Yaskawa repre-
sentative.)
Reduce the load.
S Reset the external fault from
the contact input terminal.
S Correct the cause of the ex-
ternal fault.