Conair GB - Manual (Page 90)

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¦ PART V - HARDWARE MAINTENANCE ¦
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HARDWARE ADJUSTMENTS
AIR PRESSURE
Set AIR PRESSURE to about 80 PSI for best accuracy. However, lower
pressures will work. If you plant air fluctuates, set the regulator to
the low end so that the dispense valves always see a consistent
pressure. Lubricated air is NOT recommended. GBM Micro Blenders should
be set to 40 PSI (2.7 bar). Vertical Valves used in removable hoppers on
GBM Micro Blenders, and 100 and 200 series blenders, are more accurate at
60 PSI pressure setting.
LEVEL SENSOR
Sensor position; 200 and 400 series models only:
The sensor should protrude into the mix chamber about 1/4 inch past
the inside surface of the stainless mounting plate. If it does not
protrude far enough, it will sense the mounting plate itself. If
it protrudes too far, it will sense the mix blade.
Adjusting sensor sensitivity:
1. The adjustment screw is located at the rear of the sensor.
It may be protected by a small plastic screw like cover. You
will need a very small screwdriver to adjust it.
2. Fill the mix chamber until the sensor is about 3/4 covered.
3. Turn screw counter-clockwise until the LED goes OFF.
4. Then turn clockwise until the LED just goes ON.
5. Empty the chamber and check to be sure the sensor LED does not go
on when the mix blade passes near it.
NOTE: 18 mm sensors, LED logic is reversed, ON when UNCOVERED.
WEIGH BIN DUMP VALVE
The WEIGH BIN DUMP VALVE should be adjusted to close softly. A
needle valve is installed next to the quick disconnect so that air flow
to the flap air cylinder may be restricted. Adjust as required for a
soft close.
SLIDE VALVES
Slide valves must move very freely. If they seem to jam slightly
as they reach the full extended position (closed), this may be due to
the air cylinder mount being slightly bent. If someone has pulled down
or pushed up on the air cylinder, they may have bent the cylinder
mount. You can correct this by pressing up or down on the cylinder as
required to correct the problem.
If you process very hard pellets (polycarbinate and glass filled
resins), your slide gate dispense valves may stick closed occasionally.
We provide spacers that limit the full stoke of the air cylinder. This
stops the slide from going any further then the just closed position
and prevents jamming. Call us for information.
INTERNAL MIX MOTOR and AUGER FEEDER FUSES
The MIX MOTOR timed power source and the AUGER FEEDER OUTLETS are
driven by internal solid state plug-in relays. A small 5 amp glass
fuse is located to the right of each relay. A spare fuse is also
located on the board if replacement is necessary.
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