Junction Box
Type KA-4 / KA-6
T
EECCHHNNIICCAALL
T
M
AANNUUAAL
M
L
Flintec GmbH
Bemannsbruch 9
74909 Meckesheim
GERMANY
www.flintec.com
RIGHTS AND LIABILITIES
All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by
any means, mechanical, photocopying, recording, or otherwise, without the prior written permission of Flintec
GmbH
No patent liability is assumed with respect to the use of the information contained herein. While every
precaution has been taken in the preparation of this book, FLINTEC assumes no responsibility for errors or
omissions. Neither is any liability assumed for damages resulting from the use of the information contained
herein.
The information herein is believed to be both accurate and reliable. FLINTEC, however, would be obliged to
be informed if any errors occur. FLINTEC cannot accept any liability for direct or indirect damages resulting
from the use of this manual.
FLINTEC reserves the right to revise this manual and alter its content without notification at any time.
Neither FLINTEC nor its affiliates shall be liable to the purchaser of this product or third parties for damages,
losses, costs, or expenses incurred by purchaser or third parties as a result of: accident, misuse, or abuse of
this product or unauthorized modifications, repairs, or alterations to this product, or failure to strictly comply
with FLINTEC operating and maintenance instructions.
FLINTEC shall not be liable against any damages or problems arising from the use of any options or any
consumable products other than those designated as Original FLINTEC Products.
NOTICE: The contents of this manual are subject to change without notice.
Copyright © 2007 by Flintec GmbH, 74909 Meckesheim, Bemannsbruch 9, Germany
S
AFETY INSTRUCTIONS
CAUTION READ this manual BEFORE operating or servicing this equipment. FOLLOW
these instructions carefully. SAVE this manual for future reference. DO NOT allow untrained
personnel to operate, clean, inspect, maintain, service, or tamper with this equipment.
ALWAYS DISCONNECT this equipment from the power source before cleaning or performing
maintenance. CALL FLINTEC ENGINEERING for parts, information, and service.
WARNING ONLY PERMIT QUALIFIED PERSONNEL TO SERVICE THIS EQUIPMENT.
EXERCISE CARE WHEN MAKING CHECKS, TESTS AND ADJUSTMENTS THAT MUST BE
MADE WITH POWER ON. FAILING TO OBSERVE THESE PRECAUTIONS CAN RESULT
IN BODILY HARM.
WARNING FOR CONTINUED PROTECTION AGAINST SHOCK HAZARD CONNECT
TO PROPERLY GROUNDED OUTLET ONLY. DO NOT REMOVE THE GROUND PRONG.
WARNING DISCONNECT ALL POWER TO THIS UNIT BEFORE REMOVING THE
FUSE OR SERVICING.
WARNING BEFORE CONNECTING/DISCONNECTING ANY INTERNAL ELECTRONIC
COMPONENTS OR INTERCONNECTING WIRING BETWEEN ELECTRONIC EQUIPMENT
ALWAYS REMOVE POWER AND WAIT AT LEAST THIRTY (30) SECONDS BEFORE ANY
CONNECTIONS OR DISCONNECTIONS ARE MADE. FAILURE TO OBSERVE THESE
PRECAUTIONS COULD RESULT IN DAMAGE TO OR DESTRUCTION OF THE
EQUIPMENT OR BODILY HARM.
CAUTION OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE
DEVICES.
Junction Box Type KA – Technical Manual, Rev. 1.00 August 2007
Page 2 of 4
I
NTRODUCTION AND TECHNICAL DATA
The Aluminium junction box is designed for the parallel connection of up to 4 respective 6 load cells.
Type No. of load cells Housing size Inputs Output
KA-4 bis 4 80 x 250 x 52 mm 4x M16 1x M16
KA-6 bis 6 80 x 250 x 52 mm 6x M16 1x M16
The junction box type KA can be connected to the instrumentation with a shielded 6-wire signal cable.
The corner correction is done with resistors.
Housing material: Aluminium
Protection class: IP66
Cable connection: By soldering
Corner correction: By resistors
M
ECHANICAL INSTALLATION
Look for a mounting location which is more or less dry and protected from environmental stress.
E
LECTRICAL CONNECTIONS
Figure 1: Dimensions in [mm]
The connection sequence of the load cells should correspond to the corners of the scale, i.e
Corner 1 = Load cell 1, Corner 2 = Load cell 2, etc.
L
OAD CELL CABLE CONNECTION
First the cable gland (see (1) in fig.1) must be loosened. Then you have to feed the load cell cable through the
cable gland unless the shrink tube is fully disappeared in the box. The wires have to run below the printed
circuit board and will be pulled back to the top at the upper end of the printed circuit board.
Then feed the tin-plated wires through the hole at the solder point. Use a suitable soldering iron for electronic
works (at least 30 Watt ). Proper solder joints always look bright and shiny.
Never use soldering solution and soldering grease! This will destroy the printed circuit board!
Always use suitable electronic solder, e.g. S-Sn60Pb40 DIN EN 29453.
The wires have to be connected as follows:
Cable coulour Description Solder joint designation
yellow = Cable shield Shield / Schirm
red = Signal – (Output –) red / rot
white = Signal + (Output +) white /weiss
black = Excitation – (Input –) black / schwarz
(if applicable, brown)* = Sense – black / schwarz
green = Excitation + (Input +) green / grün
(if applicable, blue)* = Sense + green / grün
* if load cell is equiped with 6-wire conductor cable
Junction Box Type KA – Technical Manual, Rev. 1.00 August 2007
Page 3 of 4
After all conductors have been soldered to the printed circuit board, the cable glands must be tightened.
Please verify that all cable glands are tight and the cable is fully stress relieved.
Important: To prevent any deterioration of the signals it is recommended to clean the printed circuit-board
from splash of solder, colophonium, grease and other dirt after the soldering works have been finalised. Use
spirit or similiar.
O
UTPUT CABLE CONNECTION
The signal cable (connection between junction box and the following electronics) should be a 6 – wire
shielded cable and has to be kept as short as possible. Depending on type and manufacturer signal cables
may have different colours. Therefore make your own choice.
Cable colour, example Description / Solder joint designation
outer cable screen = Shield
pink = Signal – (Output –)
white = Signal + (Output +)
grey = Sense –
brown = Excitation – (Input –)
yellow = Sense +
green = Excitation + (Input +)
C
ORNER CORRECTION AT SCALES WITH FLINTEC LOAD CELLS
Flintec load cells are manufactured with rather tight tolerances, so in most cases an additional corner
correction is not required. The best conditions are achieved if you use load cells of the same class
(Designation is done with capital letters A to I on the load cell package besides the type label).
Hint: Corner errors can have a mechanical background, e.g. sloped mounting surface of the load cell.
Procedure:
1. The solder points straight below the channel designation 1...4 shall connect the solder joints for the
resistors to be installed afterwards (shipment status). Otherwise the load cell will not get powered.
2. Get the display value for each corner. Use the highest possible display resolution (e.g. factor 10 or higher)
or, if this is not possible, measure the the digital weight increment using corresponding weights.
3. The corner with the lowest display value is the starting point for the corner correction. The differences of
the other corners are calculated with reference to this “basic corner”.
4. Calculate the correction resistance as follows:
Correction resistance [Ω] =
* 1100 Ω input resistance for:
400 Ω input resistance for:
Example 1: 1100 Ω load cell
0.1 kg corner error with 500 kg test load
Example 2: 400 Ω load cell
10 kg corner error with 5000 kg test load
5. Remove the solder of the corresponding solder point straight below the channel designation 1...4.
Otherwise the correction resistor to be installed would get short-circuited and would stay useless.
6. Install the correction resistor on the printed circuit-board for the corresponding load cell (the solder joints
are located on one line right and left to the channel designation 1..4).
7. Check the corners again. If required repeat the procedure.
Hint: 50 ppm resistors for corner correction are available as a set of 14 values from 0.22 Ω to 4.7 Ω (10 pcs.
for each value; article no. 5200-030).
Clean the printed circuit-board again after the corner correction has been succesfully finalised. In the junction
box you can also find a dry tablet in a plastic bag. Open the bag and leave the tablet in the junction box. This
will absorb moisture up to a certain degree. Check the cover sealing and install the cover of the box.
Deviation in [kg]
Test load in [kg]
BK2, SB4, SB5, SB6, SB14, SLB, ZLB, UB1, UB5, UB6, PB, RC3
RC1, SB2
X Input resistance of the load cell [Ω] *
0.1 kg
500 kg
10 kg
5000 kg
x
x
1100 ΩΩΩΩ
400 ΩΩΩΩ
=
0.22 Ω
=
0.8 Ω
Junction Box Type KA – Technical Manual, Rev. 1.00 August 2007
Page 4 of 4
Loading...