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4.1.9 Printed Circuit Board
The circuit board mounted inside the controller
enclosure controls the clutch solenoid and auger
motor and serves as the connection point for all
sampling system circuitry. Figure 4-2 illustrates a
typical board. Depending upon the options
selected there may be minor differences. The
following paragraphs describe the major
components of the printed circuit board, their
functions, and adjustments.
4.1.9.1 Main Fuse
This fuse, located along the top center of the
board, protects the controller and sampler
components against overloads and short circuits.
For 110/120 VAC, 1PH operation use ONLY a
Buss Type FNM, 2 Amp, 250 Volt Slo-Blo fuse or
equal.
For 220/240 VAC, 1PH operation use ONLY a
Buss Type FNM, 1 Amp, 250 Volt Slo-Blo fuse or
equal.
4.1.9.2 Motor Fuse
This fuse, located at the top left corner of the
board, protects the motor against overloads and
short circuits.
For 110/120 VAC, 1PH operation use ONLY a Buss Type FNM, 10 Amp, 250 Volt Slo-Blo fuse or equal.
For 220/240 VAC, 1PH operation use ONLY a Buss Type FNM, 5 Amp, 250 Volt Slo-Blo fuse or equal.
4.1.9.3 PC Board Fuse F3
This fuse, located to the right on the middle of the board, protects the printed circuit board against overloads and
short circuits. Use ONLY a Buss Type AGC, 1-1/2 Amp, 250 Volt fast acting fuse or equal.
4.1.9.4 Motor Timer Switches (Tens & Ones)
These rotary switches can be adjusted to vary the length of time the motor is energized and rotating the auger
during each sampling cycle to discharge a collected sample.
NOTE:
MOTOR RUN TIME IS TO BE ADJUSTED TO ALLOW THE AUGER TO CLEAN OUT THE SAMPLE
TUBE AT THE END OF EACH CYCLE. MINIMUM RUN TIME WILL DEPEND ON THE CHARACTERISTICS
OF THE MATERIAL BEING SAMPLED AND MAY WELL REQUIRE RE-ADJUSTMENT IF THE PRODUCT
BEING SAMPLED CHANGES.
Utilizing a small screw driver turn the slotted rotor of the tens and/or ones switches to desired length of time the
motor is energized during a cycle. The time period can be adjusted from 1 to 99 seconds. The timer is factory set
at 15 seconds.
FIGURE 4-2, PRINTED CIRCUIT BOARD