Flintec KPF-4 Manuale utente

Junction Box

Type KPF-4 / KPF-6 / KPF-8 / KPF-10

Flintec GmbH

Bemannsbruch 9

74909 Meckesheim

GERMANY

www.flintec.com

RIGHTS AND LIABILITIES

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.

SAFETY 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 KPF – Technical Manual, Rev. 1.11 July 2008 Page 2 of 8

TABLE OF CONTENTS

RIGHTS AND LIABILITIES................................................................................................................................2

SAFETY INSTRUCTIONS ................................................................................................................................. 2

TABLE OF CONTENTS..................................................................................................................................... 3

INTRODUCTION AND TECHNICAL DATA ...................................................................................................... 4

MECHANICAL INSTALLATION........................................................................................................................ 4

ELECTRICAL CONNECTIONS......................................................................................................................... 4

LOAD CELL CABLE CONNECTION ................................................................................................................ 5

OUTPUT CABLE CONNECTION...................................................................................................................... 5

CORNER CORRECTION AT SCALES WITH FLINTEC LOAD CELLS........................................................... 6

CLOSING THE JUNCTION BOX....................................................................................................................... 6

SUMMARY OF IMPORTANT SERVICE HINTS................................................................................................ 7

SERVICE MATERIAL ........................................................................................................................................ 8

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 3 of 8

INTRODUCTION AND TECHNICAL DATA

The Polyester junction box is designed for the parallel connection of load cells. There are 4 different types:

Type No. of load cells Housing size Inputs Output

KPF-4 up to 4 100 x 320 x 81 mm 4x M16 or 4x M12 1x M16

KPF-6 up to 6 100 x 320 x 81 mm 6x M16 or 6x M12 1x M16

KPF-8 up to 8 100 x 320 x 81 mm 8x M16 or 8x M12 1x M16

KPF-10 up to 10 100 x 360 x 90 mm 10x M16 1x M16

The junction box type KPF is special designed for weigh bridges and silos including surge arrestors for

lightning protection. It can be connected to the instrumentation with a shielded 6-wire signal cable.

The corner correction is done with resistors. Each junction box already contains 2.1 Ohm resistors for each

load cell from the factory. Therefore it is possible to decrease a load cell signal (use a higher resistance

value) or to increase a load cell signal (use a smaller resistance value).

Housing material: Polyester

Protection class: IP66

Cable connection: With clamping terminals

Corner correction: By exchangeable resistors

Other: Over-voltage protection by surge arrestors

MECHANICAL INSTALLATION

Look for a mounting location which is more or less dry and protected from environmental stress. The junction

box itself has to be mounted with the cable glands showing vertically to the bottom. A flooding or any tensile

load on the cable glands must be prevented.

All bottom parts of the cable glands are sealed to the housing with some gaskets. You have to check the

existence and the condition of these gaskets, the gaskets have to be replaced if required.

You have to check all bottom parts of the cable glands for a firm seat in the housing.

(Recommendation: use a 12-point ring spanner with a cut-out and metric size 19 mm, if the cable are already

installed).

ELECTRICAL CONNECTIONS

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. For doing this only the upper nut should be

loosened and tightened again. The lower nut (= counter nut) and the earth screw with washer must not be

rotated or loosened – the gasket is bonded! If loosened by accident the earth screw must be re-inserted and

locked with some Loctite.

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.

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 4 of 8

LOAD CELL CABLE CONNECTION

Only the cable gland nut (see (1) in fig.1) must be loosened. The bottom part of the cable gland must remain

tightened.

It is absolute necessary to check all the bottom parts of the cable glands for a firm seat in the housing!

Then you have to feed the load cell cable through the cable gland unless the shrink tube has fully

disappeared in the box, because sealing and strain relief must be done at the cable and not at the shrink

tube.

The conductor cables 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 clamping terminals as

indicated below:

Cable coulour Description Terminal designation

yellow = Cable shield yellow / gelb

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

After all conductors have been clamped to the terminals, you must tighten the cable glands. The cable must

not run sloped in the cable gland during tightening the cable gland nut.

(Recommendation: use a 12-point ring spanner with a cut-out and metric size 19 mm)

A cable gland nut is tightened correctly if the cable gland constricts the cable jacket (not the shrink tube!)

significantly!

Unused cable inlets must be closed by the delivered blind plugs. If the cable gland nuts are correctly

tightened the sealing part of the cable gland must constrict the blind plug significantly!

Please verify that all cable glands are tight and the cables are fully stress relieved.

OUTPUT CABLE CONNECTION

Only the cable gland nut (see (1) in fig.1) must be loosened. The bottom part of the cable gland must remain

tightened.

It is absolute necessary to check all the bottom parts of the cable glands for a firm seat in the housing!

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. Because this cable usually has a larger diameter than

the load cell cable, you should use the larger cable gland in the middle of the box. Depending on type and

manufacturer signal cables may have different colours. Therefore make your own choice.

Cable colour, example Description / Terminal designation

outer cable screen = Shield

pink = Signal – (Output –)

white = Signal + (Output +)

grey = Sense –

brown = Excitation – (Input –)

yellow = Sense +

green = Excitation + (Input +)

After all conductors have been clamped to the terminals, the cable gland nut must be tightened. The cable

must not run sloped in the cable gland during tightening the cable gland nut.

(Recommendation: use a 12-point ring spanner with a cut-out and metric size 19 mm)

The cable gland nut is correctly tightened if the cable gland constricts the cable jacket (not the shrink tube!)

significantly!

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 5 of 8

CORNER 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. 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.

2. 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”.

3. Calculate the correction resistance as follows:

Deviation in [kg]

Correction resistance [Ω] = Test weight in [kg] xInput resistance of the load cell [Ω] *

* 1100 Ωinput resistance for: BK2, SB4, SB5, SB6, SB14, SLB, ZLB, UB1, UB5, UB6, PB, RC3

400 Ωinput resistance for: RC1, SB2

Example 1: 1100 Ωload cell

0.1 kg corner error with 500 kg test load 0.1 kg

500 kg x1100 Ω=0.22 Ω

Example 2: 400 Ωload cell

10 kg corner error with 5000 kg test load 10 kg

5000 kg x400 Ω=0.8 Ω

4. Install the correction resistor into the junction box for the corresponding load cell excitation.

New resistor = Correction resistance + 2.1 Ω(pre-installed resistor)

5. 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 Ωto 4.7 Ω(10 pcs. for

each value; article no. 5200-030).

CLOSING THE JUNCTION BOX

In the junction box there are two dry tablets in a plastic bag. Unbag these pills and leave them within the

junction box .They will absorb moisture up to a certain degree.

Before you will close the junction box you must check the cover and the cover sealing for any dirt or damage.

Replace the cover sealing if required, otherwise a proper sealing is not assured.

Generally you have to use the red sealing made of silicone. You can improve the quality of this silicone

sealing (it must be the red one!) by using a suitable grease (e.g. sanitary grease for fittings).

The cover screws always have to be tightened crosswise and equally unless the cover is attached to the

junction box.

Generally the inside of the junction box must be totally dry before you can close the cover.

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 6 of 8

SUMMARY OF IMPORTANT SERVICE HINTS

At each re-calibration or repair following checks or actions have to be done:

1. All bottom parts of the cable glands are sealed to the housing with some gasket. You have to check

the existence and the condition of these gaskets, the gaskets have to be replaced if required.

2. You have to check all bottom parts of the cable glands for a firm seat in the housing.

(Recommendation: use a 12-point ring spanner with a cut-out and metric size 19 mm, if the cable are

already installed).

3. All cable gland nuts must be tightened. A cable gland nut is tightened correctly if the cable gland

constricts the cable jacket (not the shrink tube!) significantly! The cables must not run sloped in the

cable glands.

4. Unused cable inlets must be closed by a blind plug. If a cable gland nut is correctly tightened the

sealing part of the cable gland must constrict the blind plug significantly!

5. An eventually existing pressure compensating valve has to be removed. The corresponding hole

must be closed by a blind plug and a gasket.

6. The earth screw must be electrically connected with protective earth (potential equalisation).

For doing this only the upper nut should be loosened and tightened again. The lower nut (= counter

nut) and the earth screw with washer must not be rotated or loosened – the gasket is bonded!

If loosened by accident the earth screw must be re-inserted and locked with some Loctite.

7. Before you will close the junction box you must check the cover and the cover sealing for any dirt or

damage. Replace the cover sealing if required, otherwise a proper sealing is not assured.

Generally you have to use the red sealing made of silicone. You can improve the quality of this

silicone sealing (it must be the red one!) by using a suitable grease (e.g. sanitary grease for fittings).

8. Before you close the cover again you have to place 2 new dry tablets within the junction box.

9. The cover screws always have to be tightened crosswise and equally unless the cover is attached to

the junction box.

10. Generally the inside of the junction box must be totally dry before you can close the cover

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 7 of 8

SERVICE MATERIAL

Service kit no.1 Article no.: 5200-U1

for load cells with maximum capacity above 30 t

with ring spanner

Parts list:

Description Article no. Quantity

KP cable gland M16 x 1,5, clamping range 6.5 – 9 mm 000163 9 pcs.

Silicone cover sealing (red) 10090 1 pc.

Silicon grease, 6 g 40110 1 pc.

Dry tablet 000075 2 pcs.

Gasket 22 x 16 x 1.5 mm 4400 9 pcs.

Gasket 18 x 12 x 1.5 mm 53159 1 pc.

Round cord, 6 mm black 10101007 0.01 m

Plastic blind plug M16 x 1.5 05282 1 pc.

Plastic blind plug M12 x 1.5 00326 1 pc.

Ring spanner for M16 cable glands SSG19 1 pc.

Service kit no.2 Article no.: 5200-U2

for load cells with maximum capacity above 30 t,

like service kit no. 1 but without ring spanner SSG19

Service kit no.3 Article no.: 5200-U3

for load cells with maximum capacity in the range from 7.5 t to 22.5 t

with ring spanner

Parts list:

Description Article no. Quantity

KP cable gland M16 x 1,5, clamping range 4 – 6.5 mm 000917 9 pcs.

Silicone cover sealing (red) 10090 1 pc.

Silicon grease, 6 g 40110 1 pc.

Dry tablet 000075 2 pcs.

Gasket 22 x 16 x 1.5 mm 4400 9 pcs.

Gasket 18 x 12 x 1.5 mm 53159 1 pc.

Round cord, 6 mm black 10101007 0.01 m

Plastic blind plug M16 x 1.5 05282 1 pc.

Plastic blind plug M12 x 1.5 00326 1 pc.

Ring spanner for M16 cable glands SSG19 1 pc.

Service kit no.4 Article no.: 5200-U4

for load cells with maximum capacity in the range from 7.5 t to 22.5 t

like service kit no. 3 but without ring spanner SSG19

Junction Box Type KPF – Technical Manual, Rev. 1.11 July 2008 Page 8 of 8

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