Electronics 500-P - Manual (Page 4)

IM0053A Page 4 of 10
Be sure that the valve can be easily removed to clear any debris or contaminants that
may become lodged in the valve. A slide gate shut-off above the valve will allow
valve removal without the need to empty the shot hopper.
NOTICE: Failure to maintain shot quality may affect valve performance.
Excessive dust, fines, broken shot, oil, water, etc., may reduce or completely
stop shot flow.
5. Electrical Installation
Refer to the data sheet included with the MagnaValve for wiring instructions. A
six conductor (or 3-pair) shielded cable with minimum wire gage AWG 20 must be used.
The cable should be placed in a private conduit or seal-tite. Do not allow the cable to
be near wiring from motors or other inductive loads since this may cause electrical
interference with the sensor output signal.
Verify all wire connections prior to applying power to any system. Observe all
local and national electrical wiring codes. Do not operate MagnaValve without
all cover plates or junction box lids in place.
6. Operation
Refer to the instruction manual for the shot flow controller for additional operating
instructions. The following instructions are valid for use with either the Model 362a
shot flow controller or the Model AC shot flow controller.
7. Calibration
7.1 Calibration - Theory of Operation
The Pre-Amp performs signal conditioning ( 0-5 Vdc) and linearity compensation.
The signal conditioner uses an oscillator circuit and inductive sensor to detect metal
density (shot flow) and converts this to a 0-5 V dc output signal. The sensor signal is
non-linear and a compensator circuit is used to linearize it. The compensator circuit
corrects the output signal in 10% increments, starting at 15%, 25%, 35% etc to 95%.
7.2 Calibration - Factory Settings
The MagnaValve is factory pre-set and compensated. The standard range is 0-
1200 lbs./min. The valve is factory pre-calibrated at 10% intervals and compensated to
achieve an accuracy of 3% or better at 15% - 90% of range.
The MagnaValve Pre-Amp is used to condition the flow rate signal and transmit it
to the shot flow controller as a 0-5 Vdc signal. The linearity compensator circuit
performs output correction in 10% increments for high accuracy performance. The Pre-
Amp is factory calibrated and should not require any customer attention. The full-scale