GSI Outdoors PNEG-630 manual Metering Roll Sensors, Metering Roll Sensor Operation

Portable Dryer Troubleshooting Troubleshooting Tips

Metering Roll Sensors

Symptoms: No BPH, Total Bushels, RPM dis- played on LCD or dryer shutdown with metering roll problems

Metering Roll Sensor Operation

•Each metering roll on the portable dryer has a sensor mounted to read pulses as the metering roll is turning. These pulses are transmitted to the input/out- put board of the Electronic Monitoring Control System. The computer inter- prets this information and then displays the data on the LCD screen.

•All voltage for the metering roll sensors is derived from the input/output board of the Electronic Monitoring Control System. The sensors are operated with

12 Volts DC from terminals J5-9 and J5- 12 on the board. When checking for volt-

age the negative or black probe (-)of a voltmeter should always go to terminal J5-12.

Always use j5-12 for the negaitve anytime you check for any DC voltage on the dryer.

Then put the red probe (+) of the volt- meter on terminal J5-9. Across these two points there should be 12 volts DC. This voltage needs to be checked, but you can be reasonably assured the 12 volts DC is present if the rest of the dryer is operating. Check for this voltage on the terminal strip in the upper control box.

•12 volts DC is transmitted from J5-8 and J5-12 directly to the metering roll sensors located on the back of the dryer. Each of the metering rolls is en- closed in a white plastic box mounted to the back of the metering rolls. Inside each box is the metering roll sensor and the metering roll wheel.

•Each sensor has three(3) wires con- nected to it. Two(2) of these wires are

the incoming 12 volts DC (the T1-+12V and T2-GND terminals), and one is a pulsing

12 volts DC back to the input/output board (the T3 out terminal). Checking across T1 and T2 will verify that 12 volts DC is getting to the sensor.

•The T3 (out) terminal is what delivers the metering roll information back to the input/output board in the main con- trol box. The information for the meter- ing roll on the left side of the dryer is sent on a yellow wire and goes to termi- nal J5-16. The information for the me- tering roll on the right side is sent on a blue wire and goes to terminal J5-19.

•You can use a DC voltmeter to observe this pulsing voltage. The best place to check for this voltage is directly on the input/output board located in the very back of the lower control box on the dryer. Check for a pulsing voltage from J5-16 to J5-12 (negative) and J5-19 to

J5-12 (negative). Across each of these test points you should be able to ob- serve a pulsing DC voltage when the metering rolls are turning. You should

be able to speed up or slow down the pulses by turning the speed of the me- tering rolls up or down.

Note: Because a digital voltmeter cannot react fast enough you may not see a full 12 volts DC, instead you may see a pulsing from zero to about eight(8) volts.

Hints

•When checking for a pulsing voltage on J5-16 or J5-19 you should always leave the voltmeter across the terminals for about 30 seconds. Watch the meter closely. Each pulse should be about the same length and about the same time apart. If this is not true, suspect a prob- lem with the sensor on the back of the dryer.

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