Burkert Type 8635 - 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