TM 5-3895-374-24-1
3-2-12
Timers
The asphalt mixing plant has a number of timers that may be altered to suit specific operating conditions These timers are
preset at the time of manufacture of the plant. The preset times are very good approximations of the time intervals
required for the proper operation of the particular control function. It Is recommended that they be changed only by an
individual fully trained and experienced in the operation of the Asphalt Mixing Plant.
CAUTION
Significant changes to the times entered when manufactured may cause the plant to malfunction and
could result in damage to equipment or possibly result in personnel injury.
Make gradual changes carefully observing the results in the plant operation. If satisfactory results are not
obtained contact the manufacturer.
The timers are changed by accessing the programmable logic controller through the data table access module (DTAM)
mounted Inside the door of the cabinet below the feeder panel.
1.
Turn the control panel power on by turning the key switch to the ON position
2.
Open the door to the cabinet below the feeder panel The DTAM is mounted on the inside of the door
3.
Adjust the times by pressing the (F) key and the corresponding timer number. The digital display will read "N:#"
and the value of the Timer Preset (as preset
4.
Enter the required new Timer Preset value on the keypad and press ENTER key. The new timer value will be
displayed
The following chart indicates the timer number, the function controlled and the factory preset time,
F(O)
N7:0
Baghouse cleaning, delay to stop
300 seconds
F(1)
N7:1
Batcher gate close time
30 seconds
F(2)
N7:2
Batcher gate open time
5 seconds
F(3)
N7 3
Plant start up horn warning time
5 seconds
F(4)
N7 4
Delay time to stop hot mix conveyor
30 seconds
F(5)
N7.5
Time to close exhaust damper after purge
5 seconds
F(6)
N7-6
Time delay to stop drum on surge
bin high level signal
30 seconds
F(7)
N7-7
Run time for bin vibrators
10 seconds
page 3-493
