Azbil SVX100, Руководство пользователя

Страница: 66 / 84

56
5-1-3. General troubleshooting
If, after attaching your SVX to a control valve and performing Auto-Setup or
manualcalibration, you are experiencing performance problems, follow the troubleshooting
steps below.
If the troubleshooting procedures below do not fix the problem, contact your Azbil
Corporation representative.
SVX does not operate
(no output air pressure)
step Procedure
1 Make sure that the SVX feedback lever is not exceeding a 20° angle of rotation.
If it is, add an extension bracket to the feedback lever to provide the necessary
feedback lever length.
2 Check for air leaks in air supply.
3 Check electrical input signals.
4 Check Auto/Manual switch in Auto.
5 Check the flapper and the filter clears.
6 If communication can be made with the Communicator, perform self diagnostics
and take action based on errors messages. Refer to “Troubleshooting Codes” on
page 58.
Absence of full stroke or slow response
step Procedure
1 Check the zero (fully closed) and span (fully opened) are properly adjusted.
2 Check the EPM drive signals are within range of 50+/-25%.
3 Check the filter and the flapper clean.
Hunting or Overshoot
step Procedure
1 Change hysteresis setting from LIGHT to MEDIUM, or from MEDIUM to
HEAVY. If problem persists, set hysteresis at HEAVY and change the actuator
size setting to smaller PARAM numbers.
2 If problem persists, PARAM number sets zero (0) and varying the gain may be
required for our valve, refer to “4-4-4: Control configuration” on page 37.
3 Check permissible angle of rotation of feedback lever.