Troubleshooting; Fault Detection - YASKAWA VARISPEED-656RC5 Instruction Manual

6

TROUBLESHOOTING

6.1

FAULT DETECTION

Table 15
LED
RUN DS1 DS2
44
When the power regenerative unit detects a fault, the fault code is displayed on the
LED monitor, the fault contact output operates.
S When a fault has occurred, refer to the following table to identify and cor-
rect the cause of the fault.
S Reset the fault after restarting the power regenerative unit by turning ON
the fault reset signal or turning the main circuit power supply of and then
on again.
Fault Displays and Processing
Meaning Meaning
Meaning
External Fault
EF
Power Regenerative Unit Input
Overload
OL
Power regenerative unit input ex-
ceeded the overload capacity.
Heatsink Overheating
The temperature of the power re The temperature of the power re-
generative unit's cooling fins ex-
OH
ceeded the factory setting ceeded the factory setting.
Main Circuit Undervoltage
The main circuit DC voltage is be-
low the undervoltage detection
level.
200 V class : Approx. 190 VDC
400 V class : Approx. 380 VDC
UV
Control Power Fault
The control power supply voltage
dropped.
Inrush Prevention Circuit Fault
A fault occurred in the inrush pre-
vention circuit.
: ON : Blinking
Trouble Causes Trouble Causes
An external fault was input from
the contact input terminal.
The load is too heavy.
The ambient temperature is too
high.
There is a heat source nearby.
The power regenerative unit's
cooling fan has stopped.
S An open-phase occurred with
the input power supply.
S A momentary power loss oc-
curred.
S The wiring terminals for the in-
put power supply are loose.
S The voltage fluctuations in the
input power supply are too
large.


: OFF
Corrective Actions Corrective Actions
S Reset the fault from the contact
input terminal.
S Correct the cause of the external
fault.
Check the size of the load.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Contact
our sales representative.)
Reset the fault after correcting its
cause.
S Try turning the power supply off
and on.
S Replace the power regenerative
unit if the fault continues to oc-
cur.
S Try turning the power supply off
and on.
S Replace the power regenerative
unit if the fault continues to oc-
cur.