Electronics 500-P - Manual (Page 9)

IM0053A Page 9 of 10
7.4.3.4 Catch and Weigh Test - Confirmation
It will be necessary to repeat the above procedure to confirm calibration
accuracy. Repeat the tests for all 10 segments. Additional adjustments to a single
segment may be made if it is necessary.
8. Description of 12-Position Pre-Amp Switch
The Pre-Amp selector switch is normally placed in the RUN position (fully CCW
rotation) and this sends the actual flow rate signal to the pre-amp display. To aide
calibration and compensation this switch is also used to send pre-set voltages into the
display.
POSITION % VOLTAGE "FLOW" (assuming 0-1200 Lb/min range)
1 Run - Actual Actual
2 Zero 0 0.00 ZERO
3 15 0.75 180
4 25 1.25 300
5 35 1.75 420
6 45 2.25 540
7 55 2.75 660
8 65 3.25 780
9 75 3.75 900
10 85 4.25 1020
11 95 4.75 1140
12 100 5.00 1200
9. Maintenance and Trouble Shooting
Occasional cleaning of the MagnaValve may be necessary to prevent build-up of
dust or other contaminants. If the valve is unable to achieve a requested shot flow rate
the controller will supply a 100% duty cycle control signal to the valve and the red LED
will be constantly on. The shot flow rate controller low alarm light will be on. These
symptoms indicate that the valve is starved and the system is either out of shot or a
blockage has occurred.
10. Spare Parts
The only spare parts recommended for the MagnaValve is a spare valve driver
module. The valve driver module is located on the back side of the Model 500
MagnaValve behind the finned heat radiator. A product label on the module will identify
its model number and setting of the correct 100% duty cycle dc coil current. Replacement