KROHNE UFM 3030 Service EN - Manual (Page 42)

42 UFM 3030
8 Service and Repair
The following instructions are for use by qualified personnel only.
To avoid electric shock, do not perform any servicing other than the operating
instructions of this manual unless you are qualified to do so
8.1 Replacement of electronic unit of signal converter
The UFC 030 ultrasonic flow converter can be used as a replacement unit for the UFC 030 K
(compact system) and The UFC 030 F (separate system).
A special electronic unit is available for hazardous-duty versions (see Ex, FM or CSA installation
instructions).
Always switch off power source before commencing work!
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Use the special wrench to remove the cover from the terminal box.
Disconnect the connectors from the terminals (only for non EX version)
Use the special wrench to remove the cover from the electronic compartment.
Remove screws A, fold display board to side, and remove plug B (ribbon cable, display
board).
Remove screws D using a screwdriver for recessed-head screws and carefully remove the
complete electronics.
Remove plug CO 1/2 or CO 3/4 or CO 5/6 (depending on flow meter version).
On the new electronic unit, check the power supply voltage and fuse F1 and replace if
necessary. Also see paragraph 8.3, change of power supply fuse.
Reassemble in reverse order (points 6 to 1). Important: Ensure that the screw thread of the
covers on the electronic and terminal compartment is well greased at all times using Teflon
grease.
Sensor specific data must be entered in the converter. Contact KROHNE service on how to do
this.
All application specific settings must be re-entered after replacement of the electronic unit.
The supplied report on settings contains the standard factory setting.
It is recommended, to check, and if off, calibrate the zero and store the new zero value, see
sect. 7.2 and Function 1.1.3 / 3.1.3.
8.2 Replacement of ultrasonic flow sensor in separate systems
Always switch off power source before commencing work!
Specific calibration data for each flow sensor are determined during factory calibration. Flow sensor
specific data must be set in the UFC 030 ultrasonic flow converter when a flow sensor is replaced.
Contact KROHNE service for assistance on how to do this.
The flow sensor constant GK is specified on the nameplate. Enter value of primary constant GK in
Function 3.1.9.
If the new flow sensor has a different meter size, this must be set under Function 3.1.8. Also the full-
scale range for Q100% must be set using Function 3.1.1 (for F/R operation also see Function 3.1.2
and 3.1.3).
A zero check (Function 1.1.4) is advisable following setting of new data.