USC AT500H DUAL PUMP STAND Operating instructions

Page 1
TROUBLESHOOTING - AT500H AUTO TREATER
Below is a table describing the most frequent problems and solutions with the USC
AT500H Treater . For further assistance, contact the USC Service department at
[phone].
Problem Possible Cause Solution
Seed Gate Actuator will not
move.
1. Adjustable Chamber
mechanism jammed with
debris.
2. One or both of the two
connectors linking the
actuator to the control panel
are not connected.
1. Clear all debris and make
sure mechanism moves
freely.
2. Make sure both connectors
are properly engaged.
Seed Gate Actuator will not
return to the closed position
after all seed has emptied
from the box.
1. Proximity switch is dirty.
2. Proximity switch is set too
sensitive.
3. The system is running in
HAND mode.
1. Clean proximity switch.
2. Adjust the pump proximity
switch sensitivity
(see page 4).
3. Change to AUTO mode.
Seed Gate Actuator will not move
in AUTO.
1. Proximity switch is not
staying covered.
2. Proximity switch is not set
sensitive enough.
3. HMI screen not set to AUTO.
1. Make sure proximity switch is
staying covered with seed.
2. Adjust pump proximity switch
sensitivity by turning the
adjustment screw clockwise.
3. Set HMI screen to AUTO.
Seed Gate Actuator will not close
completely.
1. Debris may be keeping it
from closing completely.
1. Open the seed gate, remove
debris and power cycle the
entire system. When the
system is turned back on, the
gate will automatically close
and find it’s Home position.
Auger overload keeps tripping 1. Seed flow is too high.
2. Too much liquid being
applied.
1. Slow down seed flow.
2. Lower the liquid rate.

Page 2
Problem Possible Cause Solution
Flow Meter is fluctuating 1. Pump is sucking air.
2. Restriction in the line.
3. Flow meter is not full of liquid
1. Check and tighten all hose
connections.
1. Check filter to see if gasket is
missing or cracked.
2. Clean out filter and lines to
check for any debris.
3. The meter will fluctuate if
there is nothing pumping and
there is some liquid left in the
meter. Drain out liquid.
Flow meter won’t turn on 1. Improper power going to flow
meter.
2. Loose connection.
1. Check incoming power to
flow meter.
2. Check connections inside
the control panel and inside
the flow meter.
Flow Meter is reading too low or
too high.
1. Restriction in Flow Meter or
in line.
2. Air in treatment. This can
cause the flow meter to read
lower than calibrating it using
a measuring cup.
3. Seed flow has changed.
1. Flush the flow meter with
water or use compressed air
and blow air backwards
through the meter.
2. Check and tighten all hose
connections.
2. Check filter to see if gasket is
missing or cracked.
3. Recheck seed flow rate.
Flow meter will not zero 1. Improper wiring
2. Wrong parameter
programmed into flow meter
1. Check wiring schematic.
2. Check flow meter
parameters. Call local
dealer.

Page 3
Problem Possible Cause Solution
Pump will not turn off in AUTO
when seed runs out.
1. Proximity switch is dirty.
2. Proximity switch is set too
sensitive.
1. Clean proximity switch
2. Adjust the pump proximity
switch sensitivity by turning
adjustment screw counter-
clockwise (page 4).
Pump will not turn on in AUTO 1. Proximity switch is not
staying covered.
2. Proximity switch is not
sensitive enough.
1. Make sure proximity switch is
staying covered with seed.
2. Adjust pump proximity switch
sensitivity by turning the
adjustment screw clockwise
(page 4).
Pump is fluctuating. 1. Restriction in tubing
2. Filter is plugged or missing
gasket.
3. Hoses are worn out.
1. Flush tubing and check filter
for any restrictions.
2. Clean filter and check for
gasket.
3. Replace hoses.

Page 4
PROXIMITY SWITCH ADJUSTMENT GUIDE
If the proximity switch is not working properly, this can be caused by wear, dust,
or even moisture. The first step is to clean the lens of the proximity switch. If this does
not solve the problem, the next step would be to adjust the sensitivity of the proximity
switch.
The green light indicates the power status. If it is active the device is powered.
The amber light indicates when seed is being detected. If it is active it detects seed,
if inactive it does not detect seed.
Using the small screwdriver provided inside the control panel, you can adjust the
proximity switch by turning the adjusting screw on the back of the proximity switch.
 Turn Clockwise to make the proximity switch more sensitive.
 Turn Counterclockwise to make the proximity switch less sensitive.
Proximity Switch Screwdriver
Amber light
Sensitivity
Adjustment Screw
Green light