Teejet 844-E Sprayer Control Manual do Utilizador descarregar pdf (Página 30)

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844-E Sprayer Control

CHAPTER 6  TROUBLESHOOTING GUIDE

Condition Possible Cause Solution

1. Application Rate Units (GPA, G/1000

I/Ha) continually ash on/off

A. Continuous discrepancy of 10% or

more between Target Application

Rate and Actual Application Rate

Check all components and programming steps related to ow

PROGRAMMING

B. Flow meter pulses

In the System Setup mode, move to the Flow Meter Pulses section on page 14 of the

844 Installation Manual. Enter the factory calibrated ow meter pulse rate located on

the tag accompanying the ow meter.

C. Nozzle Selection In the Application Setup mode, move to the Nozzle Selection section on page 29 of

the 844 Installation Manual. Enter the correct color or the ow rate in US GPM (l/min)

{Imp. GPM} of the tips you are using at 40 psi (2 bar). For new tips, this can be found

in your TeeJet® Catalog.

If the tips have been used and possibly worn, measure the ow in US Gallons Per

Minute (Liters Per Minute) {Imperial Gallons Per Minute) at 40 psi (2 bar) and enter

the value in the User Programmable tip programming step which can be found in the

System Setup Mode on page 14 of the 844 Installation Manual.

D. Number of spray tips per boom

section

In the System Setup mode, move to the Tips Per Boom Section step on page 15 of

the 844 Installation Manual. You must enter the correct number of spray tips for each

boom section on your sprayer. Five boom sections are possible. If you do not use all

boom section switches, make sure those not used are set to “0”. Make sure that the

switch numbers being used correspond with the section numbers programmed.

Application Rate Units continually

ash on/off

A. Continuous discrepancy of 10% or

more between Target Application

Rate and Actual Application Rate

Check all components and programming steps related to ow

MECHANICAL

B. Stalled meter pulses

Make sure there is no pressure in the system. Remove the ow meter from the

discharge line. Inspect the inside of the meter for obstructions. The turbine should

move freely. If it does not rotate easily, try ushing it out with clean water. If it remains

stuck, remove the turbine by releasing the retaining clip. Clean the turbine carefully

and make sure it rotates. Replace the turbine into the ow meter body and secure with

the retaining clip.

If you have a rapid check ow meter, remove the turbine from the ow meter body by

unthreading it at the sensor. Check the turbine for obstructions. Flush with clean water

or disassemble if necessary.

C. Plugged tips In the event of plugged nozzles, remove from boom and clean with water and a TeeJet

brush. Take care not to damage the orice.

D. Wrong capacity tips All tips on the boom should be of the same style, spray angle and capacity (Flow

Rate). Replace any tips not matching those initially selected.

E. Flow meter plumbed incorrectly A ow directional arrow is located on the body of the ow meter. Plumb the ow meter

with the arrow in the direction of the ow.

The ow meter must be mounted 10″ to 12″ (25-35 cm) from other pipe ttings. See

844 Installation Manual page 7.

Generally, the ow meter works better when mounted in a vertical position with the

ow being directed up.

F. Pump capacity too low Check the pump to make sure it is working correctly. Check the plumbing system for

any obstructions. Reduce Agitation Volume.

G. Pump capacity too high Some centrifugal pumps provide more ow than necessary for the application. A

throttle valve is sometimes required to restrict the ow coming from a centrifugal pump.

Increasing bypass and agitation volumes can also help when ows are too high to

reach the target application.

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