Hypertherm HPR800XD Auto Gas Preventive Maintenance Program Rev.1 - Manual (Page 16)

16 HPR800XD Auto Gas Instruction Manual 808680
Preventive Maintenance Program
Examine the main contactor
1. Examine the contacts in the main contactor for black or rough surfaces.
2. If you find too much of this condition, replace the main contactor.
Examine the pilot arc relay
1. Remove the cover of the pilot
arc relay.
2. Examine the contacts inside the
relay for black or rough
surfaces.
3. If you find too much of this
condition, replace the pilot arc
relay.
4. Install the cover of the pilot arc
relay.
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Be careful that you do not pinch the wires between the cover and the center panel.
Do the coolant flow test
 Do the coolant flow test and record the coolant flow rate. You can find the coolant flow rate on the diagnostic screen
on the CNC. For more information, see
Do a check of the coolant flow on page 13.
 If the flow rate is below 2.9 L/min (0.75 g/min), do the coolant flow test in Coolant flow tests in the Maintenance
section of your system’s instruction manual. You may need to service the coolant system or replace the coolant pump
or motor.
 The flow alarm turns on when the flow rate is below 2.3 L/min (0.6 g/min). For more information, see Testing the flow
sensor in the Maintenance section of your system’s instruction manual.
 Examine the coolant tank for contamination. If you find any contamination, flush the tank. See Do a check of the
coolant level and condition on page 11 for instructions.
 Make sure that you use the correct Hypertherm coolant (028872) or use water that meets the requirements in Water
purity requirements in the Installation section of your system’s instruction manual.
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