Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 25)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-4
Troubleshooting (1)
(1) Alarm Number 1099 (High Temperature)
Table 4.2: Countermeasures - Alarm #1099 (High Temperature)
Cause Check Item Countermeasures
Ambient temperature of the
NC rack exceeded the
specified value* due to the
failure of the cooling fan.
*
70ºC ± 3ºC when mea-
sured above CPS-18.
Open the NC unit door to check
whether the cooling fan is operating
correctly.
•
Ensure that air is blowing out
through the ventilation port of
the cooling duct.
• Ensure that the ventilation port
of the cooling duct is not
blocked.
If the fan is faulty, it must be
replaced. Contact your Yaskawa
customer service representative.
If the cooling duct is blocked,
remove the interfering object and
start the cooling fan.
Internal temperature of the
power supply unit is high. Allow the power supply unit to cool
by turning OFF the power with the
PC NC unit door opened. If the
alarm occurs even after the power
supply unit has been cooled for 30
minutes, the power supply unit is
faulty. The power supply unit must be
changed. Contact your Yaskawa
customer service representative.
Ambient temperature of the
l NC unit is high.*
*: Allowable temperature
range for operation is
0 to 40ºC.
Measure the ambient temperature.
•
If the NC unit is placed in direct
sunlight, the NC unit tempera-
ture may exceed the allowable
limit.
This is not the failure of the NC
unit. Remove the cause.