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V-belt drive provides protection from possible severe
damage to the meter rolls and other components, in the
event the meter rolls ever become jammed with any
large foreign object.
The DC motor requires no operational adjustments and
is completely controlled by the SCR control board
assembly.
3. SPEED REDUCER GEARBOX - The 100:1 gearbox
provides the required speed reduction and transmits
power to the meter rolls through a drive chain arrange-
ment.
The gearbox requires no adjustment and under normal
conditions is considered lifetime lubricated.
All models: The gearbox is initially filled with Mobil
SHC634 which has an operating temperature range of
minus 40°F to 250°F. If after prolonged usage the unit
requires additional lubricant (due to leaks or repair),
drain and refill unit with FF part no. 069-1132-5 oil
(Mobil SHC634 or equivalent lubricant).
The drive chain should be periodically lubricated and
the drive belt and drive chain should be checked and
retensioned as required.
METER ROLL BLOCKAGE
Since the geometry of the new meter roll system
is quite large, a blockage will be unusual.
In the event a foreign object does become lodged in the
meter rolls and jams the system, the following events
could be expected to occur.
A. The unloading auger and the SCR meter roll drive
would briefly continue to operate.
B. However, the moment the meter roll becomes jammed,
the self-limiting SCR drive motor will stop rotating (and
SCR drive belt may begin slipping) and the meter rolls
would not rotate.
HOW TO DETERMINE METERING PROBLEM
Check to see if meter roll drive is rotating (drive roll cw,
drive roll ccw). If the drive is rotating correctly, then no
blockage exists. Check for a break in the power train
(broken chain, drive key, clevis pin, coupler, etc.).
NOTE: In freezing weather, the meter rolls may be
loaded with frozen grain. Operate lower burner for
several minutes with a couple of the meter roll access
doors left open to thaw grain, then reattempt to operate
meter rolls.
TO LOCATE THE JAM
To determine which meter roll is jammed, whether
drive-side or driven-side, feel the tension in the top and
bottom sections of the meter roll crossover chain (see
Fig. 6-10). If tension is equal in both sections, the drive-
side meter roll is likeliest to be jammed. If lower section
of crossover chain is extremely tight and the tension
will not equalize when attempting to deflect the bottom
section, the jam is likely to be in the driven-side meter
roll.
TO CLEAR JAM FROM METER ROLL
CAUTION: Make certain power is OFF and
locked out.
Enter the plenum and remove the meter roll
access doors. These doors are secured with two 1/2”
Head Whiz Lock Bolts. Lift up the regulator plate over
the indicated meter roll. The regulator plate can be
removed by pulling the two hitch pins at the pivot points
which allows easy access and inspection. (It is critical
that the hitch pins are re-installed once the regulator
plate is placed back in position.) Visually check for any
foreign objects that may be jammed between the grain
diverter and the meter roll. Also check for any objects
that may be submerged under the grain which may be
jammed in the lower section of the meter roll. Check
each column until jam is located, clear jam and confirm
that all regulator plates and access doors have been
correctly re-installed prior to restarting the dryer.
SCR MOTOR CONTROL
When installing a new SCR motor control, check torque
switch setting, control voltage jumper position, and
armature voltage jumper position. Set as shown in Fig.
7-4.
ADJUSTING SCR MOTOR SPEED
1. Max Pot Adjustment
With dryer unload circuit energized, set the SCR Speed
Control knob on the ASC panel to 100%. Using a
small-blade screwdriver, adjust the Max pot to obtain
180V DC across the DC motor armature terminals A1
and A2 on the Woods SCR motor control board.
Fig. 7-3 Cutaway of meter roll access area
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