Flowcharts For Diagnostics And Troubleshooting - Endress+Hauser Proservo NMS5 Operating Instruction

Proservo NMS5
Diagnostic : -49.5ºC
(Level display)
-49.5 ºC
For up to 10 elements,
check GVH450 to 459 to
find shorted element.
For 10 or more elements,
select element at
GVH470 and check
data at GVH473.
Diagnostic : 358.0ºC
Display shows
358.0ºC.
This shows special
situation of application,
not an error code.
Diagnostic : 359.0ºC
Level display shows
359.0ºC
For up to 10 elements,
check GVH450 to H9 to
find open element.
For 10 or more elements,
select element at
GVH470,view
temperature at GVH473.
Diagnostic : ADC SENSOR ERROR
ADC SENSOR ERROR
YYMMDDhhmm TT ##
TCB CN5, CN7 loose?
No
Replace TCB or detector
unit.
Endress+Hauser

11.5 Flowcharts for diagnostics and troubleshooting

Meaning:
Shorted element in NMT
temperature
Check internal wiring
connectors of NMT.
Correct any abnormality.
Check element resistance.
If the element is short-
circuited, record all the
data of the malfunction at
G4 matrix, and return the
device to Endress+ Hauser.
Meaning:
NMT can not measure
liquid or gas average
temperature for some
reasons because all
elements are in gas or
liquid phase.
Meaning:
Open element in NMT
temperature sensor
Check connectors of
NMT. Recover the wiring
if necessary. Check
element resistance.
When connector is
broken, record the data of
the malfunction at G4
matrix,and return the
device to Endress+ Hauser.
Meaning:
The A/D signal output from
the detector unit, or input to
CPU, is abnormal.
Yes
Reconnect CN5 and CN7.
11 Diagnosis and troubleshooting
Diagnostic : ADJ A, I or Z COUNTER
Meaning:
Level adjustment is required
ADJ(A, I, Z) COUNTER
at calender time by automatic
YYMMDDhhmm TT ##
configuration unit.
No
Frequent ?
Yes
Replace detector unit.
Yes
No
Frequent ?
Abnormal condition in
filed application due to
turbulence of gage head
or extreme changes of
level. Contact Endress+
Hauser representatives.
Diagnostic : A PHASE NO INPUT
Meaning:
Despite the motor (liquid level)
A PHASE NO INPUT
moving 15 mm (0.59 in) or
YYMMDDhhmm TT ##
more, A phas e input signal
was not inputted from
rotary encoder.
Yes
TCB CN5, CN7 loose?
No
Replace TCB or detector
unit.
Observed for a while
Observed for a while
Reconnect CN5 and CN7.
91