Hypertherm HD3070 Plasma Arc Cutting System w/ Automatic Gas Console - Manual (Page 143)

5-18 HD3070 with Automatic Gas Console Instruction Manual
16
MAINTENANCE
Problem Possible Causes / Solutions
7. COOLANT FLOW LED
extinguished:
7.1. Coolant flow too slow.
This LED will illuminate when flowswitch (FS1) senses a
coolant flow greater than 0.5 gpm to the torch. See Figure 6-
10 for location of flowswitch FS1, motor M1, and pump P1.
7.2. Motor M1 not functioning.
• Check to see if 240VAC is available at PL21. PL21 is located
near the pump.
Note: The 240VAC relay (CR3) on 1XPCB2 will not close
until the first 6 interlocks (STATUS indicators) are
satisfied. (See Starting Sequence of HD3070
flowchart)
• Using the electrical schematic (in back of this manual),
check pins, connections and associated wiring from PL21 to
REC5 of 1XPCB2. If 240VAC is not available at REC5, CR3
may be defective. Replace 1XPCB2 if CR3 is defective.
7.3. Flow switch FS1 not functioning.
FS1 is a normally open switch that is closed when a flow
greater than 0.5 gpm is sensed. When FS1 is closed, 24 VAC
lights the COOLANT FLOW LED.
• Check coolant hoses and connections for leaks.
Repair and/or replace defective components, if necessary.
RHF INTERLOCK
OVER TEMP
EXT INTERLOCK
GAS SYSTEM
GAS PRESSURE
COOLANT TEMP
COOLANT FLOW
STATUS
3070STAT.07