Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 172)

The VS-626M5 PC NC Maintenance Manual
4-151
List Of Inverter Faults
If a fault occurs during operation, protective functions are activated
(depending on the fault) and operation is stopped. The contents of the
faults are displayed on the digital operator (option) in AL codes and on the
7-segment LEDs in numbers.
Fault codes are output as signals to pins 26 ~ 29 of 6CN as shown in the
figure below .
Figure 4.25: Fault Code Output
Fault
No. 22
Name Contents Corrective Actions
Built-in MC operation
fault Magnetic contactor did not func-
tion. —
Heat sink overheat 1 Heat sink temperature exceeded
upper limit (minor fault). Check the ambient temperature for
effective cooling.
Heat sink overheat 2 Heat sink temperature over upper
limit continued for one minute or
longer. —
Heat sink thermistor
disconnection Thermistor for heat sink tempera-
ture detection was disconnected. Replace the unit.
The ambient temperature is low
[-20
°
C (-4
°
F) or below].
Raise the ambient temperature to
above -20
°
C (-4
°
F).
Control PC board
temperature fault 1 Control PC board temperature
exceeded +80
°
C (176
°
F) (minor
fault).
Check the ambient temperature for
effective cooling.
Control PC board
temperature fault 2 Control PC board temperature
exceeded +85
°
C (185
°
F).
—
CPU built-in A/D error Built-in A/D converter error Replace the control PC board.
ROM error Memory (PROM) error —
EEPROM error Memory (EEPROM) error —
CPU error CPU error —
Control PC board
fault WDT time exceeded. —
Table 4.36: Fault Diagnosis and Corrective Actions of Converter (Continued)
Fault Code @ › œ œ ›
6CN Pin 26 (FC0)
6CN Pin 27 (FC1)
6CN Pin 28 (FC2)
6CN Pin 29 (FC3)
(The common pin is pin 30.)