Series 830/840/860 Instruction Manual

Chapter 5 Troubleshooting

 

 

Flow Controllers with Motor-operated Rotary Valves

Problem

Possible Cause

Solution

Valve “hunts” back and forth

Pressure differential too great

Reduce pressure

continuously

Motor coupling set screws loose

Tighten set screws

 

 

Valve motor failure

Replace motor

Valve rotates continuously

Limit switch out of adjustment or bro-

Adjust or replace switch

 

ken

 

 

Microprocessor failed

Replace microprocessor

Valve does not rotate

Contaminant blocking valve

Remove blockage

 

Motor fuse blown

Replace 1 amp fast blow fuse on

 

 

motor valve board

Flow reading is erratic

Inlet filter screen clogged

Clean or replace screen

Reads full scale with no flow or

Defective sensor

Return to factory for replacement

with valve shut

Q1 shorted

Replace with same type part

 

 

U10 failed

Replace with same type part

Flow does not match set point

Insufficient pressure differential

Increase pressure or reduce set

within specifications

 

point

IM-83/84/86-H

5-3

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Sierra 840, 860, 830 instruction manual Flow Controllers with Motor-operated Rotary Valves, Valve rotates continuously

840, 830, 860 specifications

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