Worcester controls – Flowserve 90 Series Controller User Manual
Page 9
WCAIM2045
Positioner/Controller for Series 90 Modular Accessory System
9
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