TeeJet 844-AB Sprayer Control - Manual (Page 14)

12
www.teejet.com
844-AB
Regulating valve response time
Operating conditions may require a higher or lower response speed
for the regulating valve. To change the response time number, use
the Plus or Minus keys to increase or decrease the number.
Any number between 0.0 and 9.9 may be selected (0=Slow; 9=Fast).
The default value is 9.5. The first digit establishes the speed for
coarse adjustments (when relatively far from the target rate). The
second digit establishes the speed for the fine adjustment (when
relatively close to the target rate). If the regulating valve is plumbed
in a bypass line, the valve speed number of 9.5 works well for most
applications.
Figure 40: Regulating valve actuating factor
RE6
1 2 3 4 5 6 7 8 9 10 11 12
ACT
9.5
(coarse)
(fine)
If the regulating valve is plumbed in the throttling position (supply
line), start with a valve speed of 3.0 and adjust the number according
to application requirements. Adjusting agitation volumes can often
assist the regulating valve operation. Press the Programme key to
accept the entry and advance to the next step.
NOTE: The speed value can be adjusted to optimize system
performance. If the valve tends to “search” for the
programmed application rate by cycling the pressure up and
down continuously, reduce the number until the “searching”
is minimal or eliminated. A higher number will increase the
valve response speed and increase the rate of adjustment.
Pressure regulating mode
Pressure regulating mode directs the 844-AB to the location of the
regulating valve plumbing. Once established, this value should not
change unless the regulating valve is physically moved to a new
plumbing location. For additional information about plumbing, refer to
the Plumbing and installation manual supplied with this kit.
The default value of bypass “BYP” indicates that the pressure
regulating valve is plumbed in a bypass line. If no changes are
necessary, press the Programme key to accept the value and
advance to the next step.
Figure 41: Pressure regulating mode (Bypass mode)
1 2 3 4 5 6 7 8 9 10 11 12
BYP
NOTE: Once the bypass mode is selected and the console is set to
“manual” mode, the pressure regulating valve should close
when the Plus key is pressed and open when the
Minus key is pressed.
If the pressure regulating valve has been plumbed into in a supply
line to the booms, it is considered a “throttling position”. Use the
Plus or Minus keys to change the displayed value to “THR”
(throttling mode). By doing this, the polarity that the console uses to
control the regulating valve will be reversed.
Figure 42: Pressure regulating mode (Throttling mode)
1 2 3 4 5 6 7 8 9 10 11 12
ThR
NOTE: Once the throttling mode is selected and the console is set
to “manual” mode, the pressure regulating valve should open
when the Plus key is pressed and close when the
Minus key is pressed.
Press the Programme key to accept the entry and advance to the
next step.
Minimum pressure setting
The Minimum pressure setting establishes the minimum pressure
the sprayer will regulate. When the vehicle slows down, the control
system will sometimes regulate the pressure so low that it falls below
the manufacturer’s recommended pressure for the spray nozzle. It
may also reduce system flow to the point where the flow meter will
stall.
To avoid these situations, the 844-AB can be programmed to avoid
regulating below the pressure established with this setting. If the
default setting of 0.7 bar is used, the pressure will not fall below 0.7
bar while spraying in automatic mode.
Use the Plus or Minus keys to adjust the value. Press the
Programme key to advance to the next programme step.
Figure 43: Minimum pressure setting
1 2 3 4 5 6 7 8 9 10 11 12
0.7
Bar
MiN PRS