Metering roll servicing – Grain Systems PNEG-573 User Manual

Page 55

METERING ROLL SERVICING

SERVICE GUIDE FOR ALL PORTABLE DRYERS

999 provides a maximum 100%
discharge of 1960 BPH for 1214,
2240 BPH for 1216, 2520 BPH for
1218, 2800 BPH for 1220, 3080
BPH for 1222, 3640 BPH for 1226
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" discharge auger

discharge auger

discharge auger.

2. DC electric motor

DC electric motor

DC electric motor: The 3/4 HP
direct current (DC) motor

direct current (DC) motor

direct current (DC) motor pro-
vides the drive for the metering

metering

roll

roll,and is located on the front
left hand side of standard model
dryers. The output shaft

shaft

shaft of the

motor is connected directly to
the gear box assembly

gear box assembly

gear box assembly. The

DC motor requires no opera-

tional adjustment as it is com-
pletely controlled from the
control box

control box

control box.

3. Speed reducer gear box

Speed reducer gear box

Speed reducer gear box: The
direct drive gear box

direct drive gear box

direct drive gear box provides
the required speed reduction,
and transmits power to the me-
tering rolls through a drive

drive

chain

chain arrangement. The gear

gear

box

box does not require adjust-
ment. The drive chain

rive chain

rive chain should

also be periodically LUBRI-
CATED and RETENSIONED.

4. Unload auger time delay

Unload auger time delay

Unload auger time delay: The
delay controls the bottom au-

bottom au-

ger

ger system and causes the un-

un-

load auger

load auger (and any connected
auxiliary unloading conveyors)
to continue operating for the pro-
grammed amount of time, even
after the metering rolls

metering rolls

metering rolls stop.

This feature permits the clean
out of grain within the unload
ing equipment at the end of all
discharge cycles.

5. If a foreign object becomes

lodged in the metering rolls

metering rolls

and jams the system, the un-

un-

loading auger

loading auger stays in motion,
the metering roll drive

metering roll drive

metering roll drive stops

and the DC

DC motor

motor

motor should stall

out. The Electronic Monitoring

Electronic Monitoring

Control System

Control System shuts down the
dryer after a two minute period.
If any one metering roll

metering roll

metering roll or sen-

sen-

sor

sor malfunctions, the control will
display a left or right METER-
ING ROLL FAILURE warning.

1. SCR speed control

SCR speed control

SCR speed control: The meter-

meter-

ing roll speed potentiometer

ing roll speed potentiometer on
the front of the control box

control box

control box regu-

lates the speed of the DC motor

DC motor

which drives the metering rolls.

metering rolls.

The markings on the scale from 0 to
999 represent the flow of grain past
the metering rolls

metering rolls

metering rolls as a percent of the

maximum grain discharge rate for the
dryer. The maximum setting of

This dryer is equipped with SCR
metering roll drive assembly

metering roll drive assembly

metering roll drive assembly. The
metering rolls

metering rolls

metering rolls are driven by a sepa-
rate DC type electric motor. The
speed of the motor is variable, and
is controlled by an electric SCR (sili-
con controlled rectifier) control within
the main control box

main control box

main control box.

MAIN CONTROLS

The speed reducer gear box.