Electronics 500-24 - Manual (Page 4)

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c. Input Signal – The analog 0-10 Vdc input signal must be above 0.25 Vdc as a minimum flow
command signal.
For additional information about the MagnaValve consult the FC-24 installation manual.
7. CALIBRATION
Calibration of the MagnaValve is done by a catch-and-weigh test. Media is allowed to flow
through the valve for a timed period, usually one minute. The shot is weighed and compared to
the requested amount. Adjustments are made at the MagnaValve Gain Select switches and ad-
justment knob. Note: Full scale output of the valve is 10 Vdc.
8. SPARE PARTS LIST
There are no spare parts for this series of MagnaValves
9. TROUBLE-SHOOTING GUIDE
The primary trouble-shooting is accomplished by reporting the status of the 4-LED indicators on
the valve. They must all be ON in order for media to flow. If all of the LED’s are ON but there is
no media flow, check the following:
a. Is there media available from the hopper?
c. Is there any blockage above or below the MagnaValve or at the nozzle?
d. Is the magnetic field completely cancelled when the red LED is ON? Check this by removing
the valve from the machine and applying the proper signals for 100% flow.
10. MAINTENANCE
The only regular scheduled maintenance for a MagnaValve is annual re-calibration.
11. FRONT PANEL DESCRIPTION
The front panel of the MagnaValve contains the four LED’s used for diagnostics. The large
knurled screw on the front cover may be removed to gain access to the factory adjustments.
Please refer all adjustments to qualified personnel. Changing the gain will affect the valve cali-
bration accuracy and should only be done when catch-and-weigh test results are available. See
figure 1 for additional information.