vc999 RS420, Maintenance Manual

Page: 47 / 157

TROUBLESHOOTING GUIDE
SEALING DIE TOP/FORM DIE TOP
TEMPERATURE DROPS OR ELEVATES
•
Check the temperature settings in the program settings screen for recent changes.
•
Check the heat multiplier settings for recent changes.
•
Check the circuit breakers in the electrical cabinet. They are labeled CB5 and CB6
on the electric panel layout. Reset the circuit breaker if necessary. If it trips a
second time check for a short circuit or low power supply to the machine.
•
Check the die plug connection. If there is evidence of charring or discoloration clean
the contacts. Also check the pins and sockets for proper seating in the plug (i.e. not
pushed out of place or damaged from multiple connections). A bad connection on
the thermocouple contacts will cause the temperature reading to go up into the
300
0
C + range.
•
Check the wire leads from the heat plates to the wire port for damage or short circuit.
•
Check the terminal strip screws in the wire port of the die top.
•
Check the SSR’s for a proper operation. With the main power off check between
poles 1 and 2 of the SSR for continuity. If continuity exists the SSR is bad. A
replacement is required.
•
Check the thermocouple output at the terminal strip in the wire port. The reading will
be approximately 0.4mV at 70
0
F from a good thermocouple.
•
Check the resistance across the heaters at the terminal strip in the wire port. The
resistance measured will be approximately as listed:
220 Volt Number of heaters Resistance
2 24.5
Ω
3 16.3
Ω
4 12.3
Ω
380 Volt Number of heaters Resistance
2 73.5
Ω
3 49.0
Ω
4 36.8
Ω
VACUUM SYSTEM
LOW VACUUM IN PACKAGE / RESIDUAL O
2
LEVEL TOO HIGH
•
Check the vacuum time set in the current program being run on the machine.
•
Verify proper width of top web.
•
Check vacuum pump oil level.
•
Check for physical damage to the seal die bottom or top.
•
Check the seal gasket for damage.
•
Check for contamination between the die bottom platform and the seal die bottom.
•
Check filler plate height in seal die bottom for proper product support.
•
The distance from the top of the plastic filler plates to the top of the seal gasket
should be the same as the product height
•
This depth may be adjusted deeper than the product height up to 6mm, but
should never be less than the overall product height.