GSI Outdoors PNEG-630 - Manual (Page 60)

Portable Dryer Troubleshooting
59
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Metering Roll Sensors
Metering Roll Sensor Operation
• 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.
• 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
• 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.
• 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.
Symptoms: No BPH, Total Bushels, RPM dis-
played on LCD or dryer shutdown with metering
roll problems
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.
Troubleshooting Tips