vc999 RS420, Maintenance Manual

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TROUBLESHOOTING GUIDE
LOW VACUUM IN PACKAGE / RESIDUAL O
2
LEVEL TOO HIGH (cont’d)
•
Check the seal die top heat plate for an even activation. This may be done in the
manual valve operation screen. All alarms must be eliminated on the alarm screen
prior to this test to enable proper manual valve operation. Remove the film under the
seal die top to allow easier access for inspection. An inspection mirror and flashlight
will be needed to inspect the seal heat plate while the die top is installed on the
machine. In the manual valve operation screen turn V9 (seal valve) on by
highlighting the on/off value and pressing “enter” to activate the seal heat plate. The
heat plate should come down evenly and without interference. If the heat plate does
not come down evenly this may be a result of interference or a malfunctioning seal
cylinder. Inspect the edges of the heat plate for rub marks or scratches in the Teflon
coating. If interference during travel is evident the die top must be removed and the
heat plate must be adjusted on its mounting. If there is no interference in the travel
the die top must be removed and disassembled to inspect the seal cylinders for
failure or internal damage. After all necessary adjustments and inspections are
completed return the seal valve V9 to its “off” setting.
•
Verify that the signals to the die bottom and die top vacuum valves are operating
according to the time settings in the current program being ran on the machine.
•
Check the pneumatic lines from the valves that pilot the vacuum valves for damage
or air leaks.
•
Check the pneumatic valve solenoids on V7 and V8 (seal die bottom and seal die top
vacuum valves) for activation. Replace solenoids if a signal is received at the
solenoid, but the valve does not activate.
•
Check the vacuum valves and the vent valves for internal contamination or damaged
o-rings by removing the side covers on the valves. Be careful not to lose or damage
any internal parts.
VACUUM SYSTEM INTEGRITY TESTING MANUALLY
CHECK VACUUM PUMP PLUMBING SYSTEM
1. Visually inspect the vacuum hoses for damage and tighten all hose clamps in the
vacuum system.
2. Connect a vacuum gauge to t-fitting for vacuum pump.
3. Run pump for 30 seconds for maximum vacuum level.
4. Stop vacuum pump.
5. Check vacuum level deviation for 1 minute.
6. Make a note of the maximum level reached and the remaining vacuum level after 1
minute.
7. A deviation of 10 torr / 13 mB in one minute is acceptable.