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14
Causes and remedies when malfunction occurs
When experiencing malfunction please check that the installation and adjustments were carried out in
accordance with these operating instructions. Properly qualified personnel (see: Qualified personnel) must
always be present during maintenance or repair. The TRB 700 is to be observed.
Compare information regarding materials, pressure, temperature, flow direction, actuator action, spring range
and controller, with installation plans of the piping system. The conditions of usage must also correspond to
these operating instructions, the data sheet and the technical information given on the ID plate.
Danger
Troubleshooting
Malfunction
Actuator does not move valve
stem
Start-point incorrect
Valve stem moves jerkily
High air consumption
Stem moves constantly
Leakage rate is too high when
valve closed
Valve stem „knocking""
JCI Regelungstechnik GmbH
Westendhof 8 ♦ D-45143 Essen
Tel.: +49(0)201-2400-0 ♦ Fax: +49(0)201-2400-351
www.johnsoncontrols.com
During troubleshooting, safety regulations must be observed unconditionally. If the problem
cannot be solved using the following troubleshooting table please contact the
supplier/manufacturer.
See paragraphs: "Actuator mounting and removal information" and "Removing the
control valve (valve with actuator)" for any work to be carried out on the valve.
Possible cause
No air pressure
Split diaphragm
Valve plug stuck
Actuator adjustment incorrect
Control signal does not correspond to
spring range
High back pressure in valve
Valve plug etched by sticking dirt
particles
Positioner setting incorrect
Worn seals and gaskets
Leaky tubes
Unstable control, oscillation in control
system
Positioner setting incorrect
Sealing surfaces of the seat edge or
plug washed away or worn
Seat and plug dirty
Pressure balance chamber leaking
Actuator thrust too low
Flow through valve in wrong direction
111 6138 010
Remedial action
Check air pressure system
Replace membrane
Clean plug and valve seat or when
necessary replace
Carry out new adjustment
Check control and spring range
Use positioner
Clean internal parts, smoothen
damaged areas
Re-set positioner
Replace
Check amplification factor or time
constant at the controller
Re-set positioner
Replace plug (when necessary
with stem) and / or seat ring
Clean valve internal parts
Replace circlip
Use actuator with more thrust
Correct the flow direction
Rights to make technical changes
without warning reserved
A
30
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