Problem

Possible cause

Solution

 

 

 

Control is on and working, but

Faulty compressed air

Repair connection/replace

valve does not work.

connection to valve.

connector. Must have

 

 

minimum 60 psi.

 

 

 

 

Inadequate incoming vacuum

Locate problem, repair/ replace

 

signal and voltage.

as needed.

 

 

 

 

Loose connection wiring in

Repair/replace as needed.

 

control box.

 

 

 

 

 

Improper shroud solenoid

Compare voltage rating of

 

voltage compared to control

solenoids in shroud to output

 

output voltage.

voltage of controls.

 

 

 

 

 

Check solenoids in shroud and

 

 

replace as needed.

 

 

 

Control does not work.

Inadequate voltage.

Check supply voltage.

 

 

 

 

 

Make sure the unit has power.

 

 

 

 

Loose control wiring in control

Repair as needed.

 

box.

 

 

 

 

Sudden loss in conveying rate.

Control malfunction.

Repair as needed.

Possible loss of up to

 

 

Valve jammed with material.

Clean out valve.

20% conveying rate compared to

 

 

Inadequate air pressure.

Correct as needed. Minimum

non- proportioning unit.

 

60 psi required for operation.

 

 

 

 

 

 

Worn plungers.

Replace plungers (Part No.

 

 

W00533565).

 

 

 

 

Clogged filter hopper.

Clean or replace filter.

 

 

 

 

Excessive vacuum leaks/ loose

Repair/replace as needed.

 

connections to valve.

 

 

 

 

 

Worn cover seal.

Repair/replace as needed.

 

 

 

Plungers move slowly, stick, or

Inadequate air pressure.

Correct as needed. Minimum

do not seal properly.

 

60 psi required for operation.

 

 

 

 

Inadequate lubrication of air

Lubricate air cylinder.

 

cylinder.

 

 

 

 

 

Solenoids are malfunctioning.

Repair/replace as needed.

 

 

 

 

Worn/malfunctioning plungers.

Repair/replace plungers as

 

 

needed.

 

 

 

 

Sticking plungers.

Replace air cylinder.

 

 

 

 

 

Consult factory.

 

 

 

Remote Proportioning Valve

Chapter 6: Troubleshooting

26 of 30

Page 27
Image 27
Sterling 882.00268.00 specifications Problem Possible cause Solution