ROCON DeltaPoint Jr - Water Continues to Flow When Cap is Removed; Unit Will Not Restart Manually or Remotely

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ROCON LLC
Check to determine if air is trapped in the cooling water circuit. Remove the hoses TO CELL and FROM
Cell. Attach a 5-foot plastic (see-through) loop hose between TO CELL and FROM CELL on the unit.
Power up the unit. Use a flashlight to look through the plastic hose and see if air bubbles are present in
the water line. If this is the case, you need to purge the pipes. If you cannot see any air bubbles through
the plastic hose, the header system is operating normally.
Water Continues to Flow When Cap is Removed
Unit
1. Make sure the 2-position switch is not in Bypass.
2. Make sure the switch is not stuck in Start position.
Flowmeter
1. Check if the shut-off signal is transmitted by the flowmeter. See ELECTRICAL CIRCUIT. Pin 5
of J2 should go low in order to shut off the solenoid valve. This can be verified by checking the
voltage on Pin 1 of JP5. If this pin is high, there may be a damaged component on the circuit
board. Consult factory for further assistance.
2. If the shut-off signal from the flowmeter is low, check the LED on the solenoid valve DIN
connector. If this LED is on, there may be a short either in the cable or on the circuit board.
Neither one of these problems can be fixed in the field. Consult factory to arrange for an RMA.
Shut-Off Valve
**Check the manual bypass screw on the solenoid valve. The stem should be in the Normal
position.**
1. Close the supply and return ball valves. Remove both weld gun arm caps. Gradually turn the
supply ball valve ½ turn. If at any time water begins to leak through the weld gun arms (water
tube orifice), the problem lies within the solenoid valve. If no leak is detected, refer to Check
Valve leak procedure below.
2. If solenoid valve is the source of the problem, there are three possible reasons: (1) the orifice in
the diaphragm is plugged; (2) a foreign object is trapped between the valve seat and the
diaphragm; (3) the internal pilot hole is blocked between the plunger and valve cover. See
MAINTENANCE for required tools and procedure to disassemble valve.
Check Valve
1. Close the supply and return ball valves. Remove both weld gun arm caps. Gradually turn the
return ball valve ½ turn. If at any time water begins to leak through the weld gun arms (around
the water tube), the problem lies within the check valve. If no leak is detected, check for proper
hose dress.
2. Remove the check valve from manifold. See MAINTENANCE for required tools and procedure.
3. Check valve inspection - With a flat nose screwdriver, push the piston back and forth to make
sure it moves freely. If not, remove the piston from the housing. If it moves freely but you can see
a foreign object on the seat, run some water through it to dislodge the object. If you cannot
remove the foreign object, then either replace the check valve or see MAINTENANCE, “Check
Valve/Remove Piston.”
4. Reinstall the check valve after cleaning. Be careful about the flow direction on the check
valve.
Unit Will Not Restart Manually or Remotely
Unit
2-Position Switch Defective - If the lights in the switch do not activate when the unit is powered up,
replace the switch.
Reset Signal and Jumpers – See ELECTRICAL CIRCUIT and JUMPER SETTINGS while testing the
following:
1. Check the Reset signal (Pin 4 of the receptacle) for correct polarity. It should be “Active Low”
(signal going low issues a Restart).