KERN FKT User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Service manual
Touch screen –
Industrial and laboratory scales
KERN FKT / IKT / PKT
FKT_IKT_PKT-SH-e-1230
Version 3.0
1/2012
GB

2 FKT_IKT_PKT-SH-e-1230
GB KERN FKT / IKT / PKT
Version 3.0 1/2012
Service Manual
Touch screen - Industrial and laboratory scales
Table of Contents
1Basic Information .......................................................................................................3
2Introduction.................................................................................................................3
3Menu-Map....................................................................................................................4
4Troubleshooting .........................................................................................................5
5Adjustment..................................................................................................................6
6Service Menu ..............................................................................................................7
6.1 How to Enter the Service Menu ............................................................................................7
6.2 Factory Reset .........................................................................................................................8
6.3 Factory Adjustment ...............................................................................................................9
6.4 Linearity Adjustment ...........................................................................................................11
6.5 Geo Value .............................................................................................................................13
6.6 Serial Number.......................................................................................................................14
6.7 Clear Passwords..................................................................................................................15
6.8 Remark..................................................................................................................................15
7Electronics ................................................................................................................16

FKT_IKT_PKT-SH-e-1230 3
1 Basic Information
Grundlegende Hinweise
The device must be repaired only by trained specialist staff or personnel with
professional formation (such as a repair-specialist accredited by law
concerning verification).
The service manual is obligatory for repair work.
After repair, original conditions of the device have to be restored.
Only original spare parts should be used.
Instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval.
A violation of this specification will result in a loss of the type approval!
After successful repair the balance will have to be reverified before it can be used
again in a statutorily regulated field.
Das Gerät darf nur von geschultem oder beruflich ausgebildetem
Fachpersonal (z. B. eichrechtlich anerkannter Instandsetzer) repariert werden.
Die Serviceanleitung ist bindend für Reparaturen.
Das Gerät muss nach erfolgter Reparatur wieder in den Originalzustand
zurückversetzt werden.
Es dürfen nur Originalersatzteile verwendet werden.
Hinweis zu konformitätsbewerteten Waagen:
Reparatur darf nur in 100% -iger Übereinstimmung mit der Bauartzulassung erfolgen.
Ein Verstoß gegen diese Vorgabe führt zum Erlöschen der Bauartzulassung!
Nach erfolgreicher Reparatur muss eine Nacheichung erfolgen, um die Waage wieder im
gesetzlich geregelten Bereich verwenden zu können.
2 Introduction
This service manual covers the FKT, IKT and PKT series and is edited for the authorized
servicing personnel.
Note all rights are reserved. Copying any part of this manual is prohibited without our
permission.

4 FKT_IKT_PKT-SH-e-1230
3 Menu-Map

FKT_IKT_PKT-SH-e-1230 5
4 Troubleshooting
Interruption Possible cause
– – – – – –
•Overload: The scale is overloaded
•Underload: Weighing range has been fallen short of
•Mechanical defect
– – – – – –
or
– – – 92,6 g
(unstable negative value)
•Low voltage: Check power supply
•The batteries are empty and should be replaced
Weight display is not illuminated
•
The balance is not switched on
•
The mains supply connection has been interrupted
(mains cable not plugged in/faulty)
•
Power supply interrupted
The weight display changes continually
•
Draught/air movement
•
Table/floor vibrations
•
The weighing plate is in contact with foreign matter
•Electromagnetic fields / static charging (choose different
location/switch off interfering device if possible)
The weighing result is obviously incorrect
•
The balance display is not set to zero
•
Adjustment is no longer correct
•
Great fluctuations in temperature
•Electromagnetic fields / static charging (choose different
location/switch off interfering device if possible)
Should other error messages occur, switch balance off and then on again.
If the error message remains inform manufacturer.

6 FKT_IKT_PKT-SH-e-1230
5 Adjustment
The balance must be adjusted at its place of installation before initial use and at regular
intervals.
A warm-up time of about 4 hours is recommended for stabilisation.
Please use the recommended adjusting weight according to the technical data in the
operating instruction.
Remark: The adjusting of verification balances (FKT-Mand IKT-M) is only possible when
not being blocked by the adjusting switch.
The switch for this step is located at the bottom of the housing like shown below.
FKT IKT – Display device
Verification of the balance is invalid without the "seal".
1. Turn ON the balance.
2. Press the [MENU/CAL] key. Then press the [Adjustment]key to start the
adjustment procedure.
3. The display appears:

FKT_IKT_PKT-SH-e-1230 7
4. After a short time the display appears:
5. Now set the required adjusting weight in the centre of the weighing plate.
6. After a short time balance will return into weighing mode automatically.
7. Remove adjusting weight.
6 Service Menu
6.1 How to Enter the Service Menu
1. Turn ON the balance.
2. Press the [MENU/CAL] key.
3. Press the [ ▼] key, then press the [Service] key.
4. The display appears:

8 FKT_IKT_PKT-SH-e-1230
5. Enter the password [ 1 0 1 ] and confirm with [ENTER] key.
6.2 Factory Reset
Reset the application settings to factory settings, e.g. language, basic settings, weighing
technology settings etc., with [Factory reset] key and confirm with [ENTER] key.
(

FKT_IKT_PKT-SH-e-1230 9
6.3 Factory Adjustment
1. Press the [Factory adjust] key.
2. With empty weighing pan press the [Zero point adjustment] key and wait until
the display appears the stability mark .
(
(

10 FKT_IKT_PKT-SH-e-1230
3. Now select [Factory adjust] again, place the maximum weight on the weighing
pan and after that press the [Ref. Weight adjustment] key.
4. Balance measuring for approx. 1-2 minutes.
5. After that the display appears the stability mark .
6. Remove the weight.
(

FKT_IKT_PKT-SH-e-1230 11
6.4 Linearity Adjustment
1. Turn ON the balance. After warming-up time and adjustment, check balance
readings in all measuring points. In case of differences make a note.
2. Enter the Service Menu and select [Linearity].
3. The display appears the first linearity point, e.g.
4. Press the [Deviation] key to enter the difference in digit, e.g. minus 5 digit and
confirm with [ENTER] key.
(

12 FKT_IKT_PKT-SH-e-1230
5. The display appears
6. Press the [Correction] key to store the new deviation of this correction point.
7. To select another linearity point, which is outside the permissible tolerances, press
the [Corr.point:] key and inscribe the deviation like described above.
8. To return to normal weighing mode press the [ENTER] key.
Information:
If there is a positive difference (e.g. 2000.6g = + 6 digit) you should subtract this difference
to the stored value (e.g. [2000.0g -6d]).
If there is a negative difference (e.g. 1999.4g = - 6 digit) you should add this difference to
the stored value (e.g. [2000.0g +6d]).
(
(

FKT_IKT_PKT-SH-e-1230 13
6.5 Geo Value
As the acceleration value due to gravity is not the same at every location on earth, each
balance must be coordinated - in compliance with the underlying physical weighing
principle - to the existing acceleration due to gravity at its place of location (only if the
balance has not already been adjusted to the location in the factory).
To receive accurate measuring values it is recommended to adjust the balance with
external weights according to chapter 5 “Adjustment”.
In this category you can set the value of gravitational acceleration without external weights
and thus adapt the scale to local gravitational conditions.
Please only change this setting if you are certain of the correct gravitational acceleration!
(

14 FKT_IKT_PKT-SH-e-1230
6.6 Serial Number
In this category you can view or change the balance serial number.
The number was assigned to it in the factory and should never be altered.
It is only necessary to change this number after replacing the main board.
The serial number is given on the balance model label.
(

FKT_IKT_PKT-SH-e-1230 15
6.7 Clear Passwords
In this category you can clear all passwords (device code and configuration code).
Select [Clear Passwords] and confirm with [ENTER].
6.8 Remark
Please notice the categories [Temperature adjust], [Creep] and [Startup creep] were
configured and used only in our production line.
Therefore it is not recommended to use them!
(

16 FKT_IKT_PKT-SH-e-1230
7 Electronics
Optocoupler – open collectors (Digital I/O output)
Out 1 PIN
1 Diode connecting plug 5 pol.
Type Masei 5100 S version D
2
Out 2 5 4
2
3 1
Out 3 3
Performance data: Vcemax = 35 V DC
Icmax = 80 mA DC
5 Pin 4 is not allocated.
+IN (+EX)
- IN (-EX)
+ REF (+SENSE)
+OUT (+SIG)
-OUT (-SIG)
Load cell Touch
JTAG
LCD
Lightening
USB
- REF (- SENSE)
Temp. sensor
+ 9-10V
Ground
PTB-Lock
Ground
Batt +
Power supply
Accumulator
Common
INP
OUT 3
OUT 2
OUT 1
RXD
TXD
GND
RXD
TXD
GND
COM 1
COM 2
Optocoupler