TM 5-3895-374-24-2
3.
Switch the pump control to automatic and attempt to recirculate asphalt at a medium speed rate as described in
the operations manual.
4.
Observe the actual pump speed. If the speed cannot be controlled automatically, but can be controlled in manual
the A/C Pump Speed Output interface module in line with Blend I/O terminals 23 and 24 should be replaced.
DANGER - HIGH VOLTAGE.
Feeder Aggregate Speed Control
Inspect all sensor cables and connections.
1.
Verify that the drive operates properly in the manual position.
2.
Verify a suitable value for the feeder calibration as shown in screen 8658 in TPH at full speed.
3.
Switch the suspect feeder control to automatic and attempt to run a feeder calibration as described in the
operators manual.
4.
The corresponding Run Output module (#23, 22, 21 or 20) on the Blend I/O card and verify light is illuminated.
DANGER - HIGH VOLTAGE.
5.
The corresponding Feeder Speed Output module (#8, 9,.10 or 11) on the Feed I/O card should be replaced.
DANGER - HIGH VOLTAGE.
Divert Valve Fails to Operate
1.
Check divert valve by selecting manual positions. If it moves air, supply and valve/cylinder assembly are
functional otherwise check air supply and valve etc.
2.
Select OFF position for asphalt metering pump to stop asphalt being injected into drum mixer and then select
drum position manually, check divert valve solenoid; is the pilot light on valve illuminated? If yes problem is in air
supply or solenoid valve. Verify air supply and change valve as necessary.
3.
If pilot light on valve is NOT illuminated check Relay CR244 in lower section of control panel " A "; relay will
energize when divert valve is selected to DRUM position .
4.
If relay CR244 does not energize during automatic operation of Divert Valve but functions normally during manual
operations check output module # 16 on BLEND I/O card of process control computer. Module pilot light will
illuminate when divert valve is requested to go to DRUM position, replace module if light illuminates and valve fails
to move to requested position. (CAUTION HIGH VOLTAGE)
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