Airstream PNEG-343 - Manual (Page 31)

31
METERING ROLL SERVICING
SERVICE
adjustment as it is completely
controlled from the control box.
3. Speed reducer gear box: The
direct drive gear box provides
the required speed reduction,
and transmits power to the me-
tering rolls through a drive chain
arrangement. The gear box does
not require adjustment. The drive
chain should also be periodically
lubricated and retensioned as
necessary.
4. Unload auger time delay: The
delay controls the bottom auger
system and causes the unload
auger (and any connected aux-
iliary unloading conveyors) to
continue operating for the pro-
grammed amount of time, even
after the metering rolls stop.
This feature permits the cleanout
of grain within the unloading
equipment at the end of all dis-
charge cycles.
5. If a foreign object becomes lodged
in the metering rolls and jams
the system, the unloading auger
will stay in motion. However,
the metering roll drive will stop
and the DC motor should stall
out. The Electronic Monitoring
Control System will shut down
the dryer after a two minute
period. If any one metering roll
or sensor should malfunction
the control will display a left or
right metering roll failure warn-
ing.
The speed reducer gear box.
discharge rate for the dryer. The
maximum setting of 999 provides
a maximum 100% discharge of
1960 BPH for 1314, 2520 BPH for
1318, 3080 BPH for 1322 model
dryers.
Note: When the control is set
to the maximum discharge rate
(999), the metering roll speed
should be 17.5 RPM for 8" dis-
charge auger.
2. DC electric motor: The direct
current (DC) motor provides
the drive for the metering roll,
and is located on the front left
hand side of standard model
dryers. The output shaft of the
motor is connected directly to
the gear box assembly.The DC
motor requires no operational
1. SCR speed control: The meter-
ing roll speed pots on the front
of the control box regulate the
speed of the DC motor which
drives the metering rolls.
The markings on the scale from
0 to 999 represent the flow of
grain past the metering rolls as
a percent of the maximum grain
This dryer is equipped with SCR
metering roll drive assembly. The
metering rolls are driven by a
separate DC type electric motor.
The speed of the motor is vari-
able, and is controlled by an
electric SCR (silicon controlled
rectifier) control within the main
control box.
MAIN CONTROLS