S/hart) other malfunctions – Burkert Type 8635 User Manual
Page 141

8635 - 139
M
AINTENANCE AND
E
RROR
E
LIMIN
.
ON THE
P
ROCESS
C
ONTROLLER
(S/HART)
Other malfunctions
Problem
Possible causes
Remedy
POS = 0 (with CMD > 0 %) or
Tight-closing function
Deactivate tight-closing
POS = 100 %, (with CMD < 100%) (CUTOFF) has been
function
PV = 0 (with SP > 0 ) or
inadvertently activated
PV = PV (with SP > SP )
Only with device with process
controller:
Device does not work as a
Menu item
P.CONTRL stands in
Remove the menu item
positioner despite correctly
main menu. The device thus
P.CONTRL from the main
executed settings.
works as a process controller
menu.
and expects a process value at
the corresponding input.
Error messages on execution of the function P.Q'LIN
Display
Causes of error
Remedy
Q.ERR 1
No compressed air connected
Connect compressed air
No change of process variable
Check process; if necessary, switch on
pump or open shut-off valve
Q.ERR 2
Current fixed point of the valve stroke
was not reached since
• air supply failure during P.Q’LIN
• Check compressed air supply
• no AUTOTUNE has been executed
• Execute AUTOTUNE