Maguire Products Weigh Scale Blender WSB, Operation & Maintenance Manual

Page: 81 / 99

M A G U I R E P R O D U C T S , I N C .
Edition: August 5, 2014
81
W E I G H S C A L E B L E N D E R
®
SECTION 5 - HARDWARE MAINTENANCE
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. Micro Blenders should be
set to 40 PSI (2.7 bar). Vertical Valves used in removable hoppers on 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.
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 (polycarbonate 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.