Junction Box
Type KPFD-8 for digital load cells
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 KPFD – Technical Manual, Rev. 1.02 December 2007
Page 2 of 4
I
NTRODUCTION AND TECHNICAL DATA
The Polyester junction box is designed for the parallel connection of up to 8 digital load cells.
Type No. of load cells Housing size Inputs Output
KPFD-8 up to 8 digital LC 100 x 320 x 81 mm 8x M16 1x M16
The junction box type KPFD is special designed for weigh bridges and silos including surge arrestors for
lightning protection. It can be connected to the instrumentation with a special shielded cable (3x twisted pair
cable, AWG24, and shield according DIN 47 100).
Housing material: Polyester
Protection class: IP66
Cable connection: With screw terminals
Corner correction: Not required
Other: Over-voltage protection by surge arrestors
M
ECHANICAL INSTALLATION
Look for a mounting location which is as dry as possible and protected from environmental stress.
E
LECTRICAL CONNECTIONS
1
1
2
2
2
2
1
1
Figure 1: Dimensions in [mm]
The earth screw (see (2) in fig.1) has to be connected to protective earth or you must establish an electrical
connection to the weigh modules for potential equalisation.
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.
D
IGITAL LOAD 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, because sealing and strain relief must
be done at the cable and not at the shrink tube. The wires (wh, br, ye, gn, gr, pk) 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. Afterwards
you can connect the cables to the screw terminals as indicated below:
Cable coulour Description Terminal designation
white = Excitation + (Input +) weiss / white
brown = Excitation – (Input –) braun / brown
yellow = RS485A out gelb / yellow
green = RS485A out grün / green
grey = RS485A in grau / grey
pink = RS485A in rosa / pink
transparent = Cable shield transparent
After all conductors have been clamped to the terminals, the cable glands must be tightened. Please verify
that all cable glands are tight and the cable is fully stress relieved.
Junction Box Type KPFD – Technical Manual, Rev. 1.02 December 2007
Page 3 of 4
O
UTPUT CABLE CONNECTION
The signal cable (connection between junction box and the following electronics) should be a 6 – wire
shielded cable (3x twisted pair cable, AWG24, and shield according DIN 47 100). The cable length should not
exceed 100 m. Depending on type and manufacturer signal cables may have different colours. Therefore
make your own choice.
Cable colour, example Description Terminal designation
white = Power supply + PWR+
grey = Power supply + PWR+
brown = Power supply – PWR–
pink = Power supply – PWR–
yellow = RS485 A A
green = RS485 B B
outer cable screen = Shield Schirm / Shield
Insert jumper (JP)
Insert jumper (JP)
at the last load cell.
at the last load cell.
In case of 8 load cells
In case of 8 load cells
no jumper.
no jumper.
R10
470 Ω
R10
470 Ω
R10
470 Ω
R9
120 Ω
R9
120 Ω
R9
120 Ω
R11
470 Ω
R11
470 Ω
R11
470 Ω
Figure 2: Wiring
Important Hints:
1. Verify the correct position of jumper JP (see figure 2).
2. If the connected weighing electronics has built-in RS485 termination (e.g. FlintWeigh, FT-11D, FT-16D)
then the resistors R9, R10 and R11 have to be removed (e.g by using a wire cutter).
P
ROTECTIVE ACTION AGAINST MOISTURE
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.
Afterwards check the cover sealing against dirt and install the cover of the box. Fix the screws equally and
crosswise. If the installation takes places at humid weather, we recommend to use a blow-dryer or similiar to
dry the interior before the junction box will be closed.
Junction Box Type KPFD – Technical Manual, Rev. 1.02 December 2007
Page 4 of 4
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