Graco 313296J Uživatelský manuál Strana 29

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Operation
313296J 29
3. Press while in the Ram Operation screen.
4. When the confirmation screen appears with a
prompt, select to start the pump.
5. Open the pump air valve (BF) and keep the director
valve (BC) set to DOWN while pump is operating.
NOTE: Increase air pressure to the ram if the pump
does not prime properly with heavier fluids.
Decrease air pressure if fluid is forced out around
the top seal or platen.
Automatic Crossover
(Tandem Supply System Only)
The automatic crossover feature allows continuous flow
and prevents system shutdown. If the active ram
encounters a pump runaway or drum empty alarm, it will
attempt an automatic crossover to the inactive ram.
The system will generate a crossover error if the active
ram attempts an automatic crossover while the inactive
ram has a pump runaway, drum empty, or not primed
alarm. If this occurs, correct the error and clear the
alarm from the Alarm screen. See Alarm Screen, page
103, for details.
Manual Crossover
(Tandem Warm Melt Supply System Only)
Manual crossover can only be initiated if the following
conditions are met:
inactive ram is not in the drum empty error condi-
tion.
pump runaway and not primed alarms do not exist.
To initiate a manual crossover to the inactive ram:
1. From the Ram Operation screen, press the Cross-
over key . The display prompts the operator
to confirm.
2. Select to confirm manual crossover operation
or select to cancel.
NOTE: If the active ram has a pump runaway error
or drum empty error, the system will attempt an
automatic crossover.
F
IG
. 25: Ram Operation Screen - Tandem System
Keep clear of the inactive ram, as automatic cross-
over may occur unexpectedly. To repair or adjust the
ram, first follow all steps of the Pressure Relief Pro-
cedure on page 28.
F
IG
. 26: Crossover Function Screen
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