Troubleshooting for low fan speeds – MAGFAN
Diagnostic codes 744 – 746
Diagnostic codes 744 – 746 occur when a magnetics fan is under performing.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
744 The fan tachometer feedback for MAGFAN 1 is less
than the minimum acceptable value.
All models None
745 The fan tachometer feedback for MAGFAN 2 is less
than the minimum acceptable value.
All models None
746 The fan tachometer feedback for MAGFAN 3 is less
than the minimum acceptable value.
XPR460 None
• Set process
• Remote on-off
Corrective action
1. Use the Fan diagnostic codes diagram on page 368 to identify the location of the MAGFAN in the
plasma power supply.
2. Make sure that the following fan connections are good, and tighten loose connections if found:
a. The fan connector
b. The wiring to J2, J3, and J5 on the fan power distribution PCB
c. The wiring to J7 on the control PCB
3. Examine the 48 VDC power source output.
4. If the power output is not correct, replace the 48 VDC power source.
5. Examine the solid-state relay, and make sure that it is operating correctly.
6. If you do not find any loose connections and the 48 VDC power source and solid-state relay are good,
replace the fan.
Troubleshooting for low fan speeds – HXFAN
Diagnostic codes 748 and 749
Diagnostic codes 748 and 749 occur when a heat exchanger fan is under performing.
Diagnostics and Troubleshooting
8
371811530Instruction ManualXPR460
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