Inspect the main contactor, Perform coolant flow test – Hypertherm MAXPRO200 Preventive Maintenance Program User Manual
Page 13
MAXPRO200 Preventive Maintenance Program Instruction Manual 808800
9
Inspect the main contactor
Visually inspect the main contactor for excessive pitting and for blackened or rough surfaces on any of the contacts. If this
condition exists, replace the main contactor.
Perform coolant flow test
The control board receives an electrical signal in Hz from the flow sensor, that is converted and shown as flow in gallons
per minute (gpm). Normal flow is 4.5 lpm (1.2 gpm), but this will vary depending on lead lengths and whether the power
is 50 Hz or 60 Hz. PCB4 will allow the system to operate if the coolant flow is 1.9 lpm (0.5 gpm) or greater. If the system
shows a coolant flow error (093) the system will need to be turned OFF and then ON again and the following test needs
to be performed to determine if the problem is coolant flow or the flow switch.
1. Turn OFF the power, and remove the right-side panel from the power supply.
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