KROHNE CORIMASS G-MFM 4085 EN - Manual (Page 90)

90
Group Fault / Symptom Cause Remedy
Group E
E1 Control input does not
function
Connection / polarity
incorrect.
Correct as per Sect. 2.3
Programming incorrect Correct the programming
as per Fct. 3.6.1 - 3.6.2. Test
as per Fct. 2.15. If test is
faulty, the output is faulty.
Replace converter or call
Krohne Service.
Control input switched off. Switch on as per Fct.
3.6.1
Group ST
ST1 Display keeps returning
to ”test”. (during start-up)
Poor/intermittant power.
Supply to meter.
Check incoming supply
Hardware failure Replace converter or call
Krohne Service.
ST2 Display returns to ”Start
up” and the status arrow is
illuminated.
Possible poor mechanical
installation.
Check install factor and
correct installation as per
Section. 1
Check the status list in
reset/quit menu as per
Section 4.5 and acknow-ledge
the error message.
Primary Sensor faulty Check as per Sect. 8.8
Fuse F11 blown. (negative
analog voltage).
Call Krohne Service.
ST3 Display returns to Start-
up and the primary sensor is
noisy.
Sensor cannot vibrate
freely due to poor mechanical
installation.
Correct installation as per
Section 1 and try again.
Group OP
OP1 Installation factor larger
than value given in Sect.
1.2.3
Mechanical installation not
correct or air bubbles in
process fluid. External
influences due to pumps,
motors, etc.
Check installation and
correct if necessary (see
Section 1). Flush process pipe
work to get rid of air.
OP2 Display indicates a flow-
rate during zero setting.
Valves closed.
Valves not shut tight or air
in process fluid.
Check valves for tight shut-
off. Flush lines with high
velocity.
Zero calibration not OK Check that flow is zero and
pipe is full without air bubbles.
Do automatic calibration as per
Section 5.1 and ensure that a
”0” is programmed in the zero
set function.