Yaskawa YASNAC PC NC Maintenance Manual User Manual
Page 188
PC NC Maintenance Manual
Chapter 6: Module/Unit Replacement
6-6
4.
Disconnect the fan power connector from the motherboard recep-
tacle labeled FAN3, and remove fan wires from the wire clip.
5.
Remove the complete CPU rack fan assembly by loosening the
two bottom mounting screws.
Install a CPU rack cooling fan unit by following the steps below.
1.
Attach the new CPU rack fan assembly to the CPU rack and
tighten the two bottom mounting screws.
2.
Insert the fan power connector into the FAN3 receptacle and
place the fan wires inside the wire clip. Lock the wire clip by
pushing in the tab.
3.
Close the door and tighten the top/bottom thumbscrews.
4.
Install the center cover plate and tighten the top/bottom thumb-
screws.
Following installation, verify functions as follows.
1.
Return the CPU rack power supply switch to the “I” position and
power up to restart the control unit.
2.
Check that the CPU rack fan is operating properly. The fan
should blow air tot he outside of the CPU rack.
2.
Check for any CPU rack fan-related alarms.
3.
Check the CPU Monitor screen on the MMI to verify the fan is
working properly. The fan speed readout should be approximately
2500rpm.
CPU Rack Unit
When the internal CPU rack components (other than the CPU rack cooling
fan and the hard disk drive) are defective, the entire CPU rack unit must be
replaced. To remove the CPU rack unit, follow the steps below.
1.
Verify that the main power is OFF and that the power supply
switch for the rack is in the “O” position.
2.
Remove all cables and wiring from the CPU rack unit.