Worcester controls – Flowserve 90 Series Controller User Manual

Page 9

WCAIM2045

Positioner/Controller for Series 90 Modular Accessory System

Problem

Possible Cause(s)

Solution

Actuator responding

Throttle valve(s) closed or not

Adjust throttle valve(s).

slowly or not at all

open enough

Actuator opens normally

SR-PC solenoid block used on

Use proper solenoid block – DA-PC.

but will not close

double-acting actuator
(Check markings on block.)

Actuator opens to position

DA-PC solenoid block used on

Use proper solenoid block – SR-PC.

and then sits there and

spring-return actuator

oscillates back and forth

(Check markings on block.)

No response from solenoids

Air pressure too low

Pressure should be 45 PSIG minimum.

Defective pressure switch

Replace switch.

Solenoids operate but do

Connectors to solenoids reversed

Reverse solenoid leads (Refer to section 10.f).

not get correct response
from actuator

Flow Control Division

Worcester Controls