Hypertherm HSD130 HySpeed Plasma - Manual (Page 170)

MAINTENANCE
5-24 HySpeed HSD130 RHF Instruction Manual
1. Turn OFF the power, and remove the right-side panel from the power supply.
Coolant flow test procedure
The control board (PCB4) receives a contact closure signal from the flow switch when the flow rate is 2.3 lpm (0.6 gpm)
or greater. 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 2.3 lpm (0.6 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.
2. Remove the return hose at the top of the coolant tank. Apply gentle pressure to the hose while pulling back on the
collar of the elbow fitting. This will release the coolant hose. No tools required. Put the end of the return hose into a
20 liter (5 gallon) container.