Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 17)

PC NC Maintenance Manual Chapter 2: Routine Inspection
2-4
2.4 Fan
Verify the CPU rack cooling fan is running by placing a hand on the outside case in
the path of the airflow.
Figure 2.3: CPU Rack and Fan
If the cooling fan speed falls below 2000rpm, a “Slow Fan” warning message
appears. When this occurs, open the CPU rack and check the fan for any obstacles
that may inhibit the fan rotation. If no obstacles are present, call a Yaskawa cus-
tomer service representative.
If the CPU rack cooling fan speed falls below 1800rpm, a “Fan Alarm of CNC
Unit” message appears. When this occurs, Cycle Start is not possible. Open the
CPU rack and check the fan for any obstacles that may inhibit the fan rotation. If
no obstacles are present, call a Yaskawa customer service representative.