L-Acoustics KS28 Owner'S Manual Download Page 47

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Corrective maintenance

Corrective maintenance

Introduction

This section contains the following maintenance procedures:

•

D/R - Grill

(p.49)

•

D/R - LF loudspeaker

(p.53)

For advanced maintenance, contact your L-Acoustics representative.

Tools

Before performing maintenance on this product, make sure all the tools listed are available.

Reference are given for FACOM

products in this table. Other manufacturers can be used.

Name

Reference

Distributor

set of 6-point 1/4" sockets

RL.NANO1 / R.360NANO

FACOM

T10 Torx bit

EX.110

FACOM

torque screwdriver (2 - 10 N.m)

A.404

FACOM

Included in the L-Acoustics Maintenance Toolcase.

Maintenance Toolcase

The Maintenance Toolcase is a carry-on suitcase that includes all the tools required to perform maintenance on L-

Acoustics products. This toolcase is aimed at Certied Providers.
The Maintenance Toolcase uses a Peli

™

1510 Protector case that features three pre-cut layers of foam to safely t the

tools. The Maintenance Toolcase includes tools manufactured by FACOM

, Fluke

, Tohnichi, ABUS, and Würth.

All third-party trademarks, registered trademarks, or product names are the property of their respective owners.

KS28 owner's manual (EN) version 1.0

Summary of Contents for KS28

Page 1: ...KS28 owner s manual EN ...

Page 2: ...anual EN version 1 0 Distribution date September 13 2022 2022 L Acoustics All rights reserved No part of this publication may be reproduced or transmitted in any form or by any means without the express written consent of the publisher ...

Page 3: ... and handling elements 14 KS28 CHARIOT 14 KS28 PLA 15 KS28 COV and KS28 CHARIOTCOV 16 Mechanical safety 17 Loudspeaker con gurations 19 KS28 in standard con guration 19 KS28 in cardioid con guration 20 Inspection and preventive maintenance 21 How to do preventive maintenance 21 Rigging part inspection 22 Mechanical system overview 23 Inspection references 26 Rigging check 31 Acoustical check 33 Ri...

Page 4: ...Connection to LA ampli ed controllers 45 Corrective maintenance 47 Speci cations 54 KS28 54 KS28 BUMP 56 KS28 PLA 57 KS28 CHARIOT 58 LA SLING2T 59 APPENDIX Recommendation for speaker cables 60 4 ...

Page 5: ...he rigging techniques and safety recommendations outlined in this manual Ensure personnel health and safety During installation and set up personnel must wear protective headgear and footwear at all times Under no circumstances is personnel allowed to climb on a loudspeaker assembly Respect the Working Load Limit WLL of third party equipment L Acoustics is not responsible for any rigging equipment...

Page 6: ...r notice Check www l acoustics com on a regular basis to download the latest document and software updates Long term exposure to extreme conditions may damage the product For more information refer to the Products weather protection document available on the website Read the maintenance section of this document before servicing the product Contact L Acoustics for advanced maintenance Any unauthori...

Page 7: ...tically in standard or cardioid arrangements With KS28 BUMP KS28 can be own in vertical arrays of standard or cardioid arrangements up to 16 units How to use this manual The KS28 owner s manual is intended for all actors involved in the system design implementation preventive and corrective maintenance of the KS28 system It must be used as follows 1 Read the technical description for an overview o...

Page 8: ...etworking capabilities Refer to the LA12X LA2Xi owner s manual for operating instructions Rack LA RAK II AVB Touring rack containing three LA12X LA POWER II for power distribution LA PANEL II for audio and network distribution and two LS10 for AVB distribution Cables SP cables SpeakON loudspeaker cables 4 point 4 mm gauge Come in different sizes SP 7 0 7 m 2 3 ft SP5 5 m 16 4 ft SP10 10 m 32 8 ft ...

Page 9: ...s for 1 x KS28 KS28 COV Protective cover for 1 x KS28 KS28 CHARIOT Chariot for up to 4 x KS28 KS28 CHARIOTCOV Protective cover for 3 or 4 x KS28 on KS28 CHARIOT Software applications Soundvision 3D acoustical and mechanical modeling software LA Network Manager Software for remote control and monitoring of ampli ed controllers Refer to the Soundvision help Refer to the LA Network Manager help Syste...

Page 10: ...System components 2WAY SUB1 SUB2 3 5 m 11 5 ft DO3WFILL Rigging accessories KS28 BUMP LA SLING2T Transportation KS28 PLA KS28 COV KS28 CHARIOT KS28 CHARIOTCOV 10 KS28 owner s manual EN version 1 0 ...

Page 11: ...g gain delay polarity mute SR OUT 1 SR ON SB OUT 2 SB ON SB OUT 3 SB ON SB OUT 4 SB IN A 0 dB 0 ms ON Connectors 1k IN k 1 IN Znom 4 Ω Read manual and safety instructions before use Made in France European Community SAFE USE 16 KS28 FOROTHERCONFIGURATIONS CHECKMECHANICAL SAFETYWITHSOUNDVISIONSOFTWARE USEONLYWITHL ACOUSTICSAMPLIFIEDCONTROLLERS KS28 Weight 79 kg 174 lb KS28 1 4 point speakON Interna...

Page 12: ...mic handles on each side KS28 features two ground runners for enclosure protection Two tracks on the top of the enclosure t the ground runners in stacking deployment KS28 features eight L shaped side runners for side protection and upright stacking 12 KS28 owner s manual EN version 1 0 ...

Page 13: ...lable to implement a secondary safety Always use the holes next to the pickup points to implement a safety Lifting with two motors two chains pickup points safety points pickup points safety points 1200 mm 47 2 in 1080 mm 42 5 in 650 mm 25 6 in 530 mm 20 9 in Lifting with one motor one LA SLING2T or an adapted bridle safety points pickup points safety points pickup points 1200 mm 47 2 in 1080 mm 4...

Page 14: ...orage and handling elements KS28 CHARIOT KS28 CHARIOT is designed to transport a stack of up to four KS28 and features two rigging arms to secure the lower KS28 2415 mm 95 1 in 1859 mm 73 2 in 14 KS28 owner s manual EN version 1 0 ...

Page 15: ...l stability Risk of brake damage Do not use the brakes during transportation Multiple KS28 CHARIOT can be piled for easy storage KS28 PLA KS28 PLA is a dolly board designed to be tted to the front of a KS28 with two spring loaded pins KS28 owner s manual EN version 1 0 15 ...

Page 16: ...r KS28 on KS28 PLA foldable flaps to access the connectors KS28 CHARIOTCOV is a cover for a stack of three to four KS28 on KS28 CHARIOT To t a stack of three KS28 KS28 CHARIOTCOV must be folded inwards and secured with the provided velcro straps the logo must be on the front face velcro straps inside 16 KS28 owner s manual EN version 1 0 ...

Page 17: ...ystem Before any installation always model the system in Soundvision and check the Mechanical Data section for any stress warning or stability warning In order to assess the actual safety of any array con guration before implementation refer to the following warnings Rated working load limit WLL is not enough The rated WLL is an indication of the element resistance to tensile stress For complex me...

Page 18: ...e the warning Additional safety for own arrays When ying an array use available holes to implement a secondary safety Considerations must be given to unusual conditions Soundvision calculations are based on usual environmental conditions A higher safety factor is recommended with factors such as extreme high or low temperatures strong wind prolonged exposition to salt water etc Always consult a ri...

Page 19: ... KS28 subwoofers can be driven by the LA12X LA2Xi ampli ed controllers vertical on end block stacked upright horizontal Preset KS28_60 KS28_100 Low frequency limit 10 dB 25 Hz Delay values When combining a line source with subwoofers delays may have to be added to the presets Refer to the Preset Guide to obtain the pre alignment delay values Grouping subwoofers Place the subwoofer enclosures side ...

Page 20: ...d block stacked upright Preset KS28_60_C KS28_60_Cx KS28_100_C KS28_100_Cx Low frequency limit 10 dB 25 Hz Use xxxx_xx_C or xxxx_xx_Cx on a reversed subwoofer in a cardioid con guration The cardioid con guration consists in reversing 1 element in an array of 4 subwoofers Refer to the subwoofer owner s manual and to the Cardioid con gurations technical bulletin Delay values When combining a line so...

Page 21: ... the Mechanical system overview p 23 to identify critical parts of the system and apply the speci c checks described in the Inspection references p 26 Do the Rigging check p 31 If any parts are damaged contact your L Acoustics representative for further instructions Acoustics Perform the Enclosure check p 33 Perform the Listening test p 35 to detect any degradation in sound quality If necessary re...

Page 22: ... that the rigging part is present 2 If applicable disassemble the rigging part from the enclosure or the rigging accessory Check that the tethers are intact and safely secured 3 Inspect the part from every side Compare with the reference pictures Check for corrosion wear and cracks bends and dents holes missing safety cues missing identi cation labels missing or loose fasteners Replacing screws If...

Page 23: ...k Perform the Rigging part inspection p 22 on critical parts For each part refer to the Inspection references p 26 Replacing screws If a screw is loose remove and replace it Always use the new screws provided in the repair kit If no new screw is available add blue threadlocker before reusing the screw Do not apply more than the indicated torque KS28 owner s manual EN version 1 0 23 ...

Page 24: ...spection and preventive maintenance KS28 array with KS28 BUMP Shackles p 26 Ball locking pins p 27 Grill safety p 30 Runners and corner stops p 29 Rigging check p 31 24 KS28 owner s manual EN version 1 0 ...

Page 25: ...tive maintenance KS28 array with KS28 CHARIOT Grill safety p 30 Runners and corner stops p 29 Rigging check p 31 the rigging arm can rotate freely apply the brakes the stack is blocked KS28 owner s manual EN version 1 0 25 ...

Page 26: ...reventive maintenance Inspection references Shackles Drive the shackle axis in its lodging Make sure that the end is ush with the shackle Related tasks Rigging part inspection p 22 26 KS28 owner s manual EN version 1 0 ...

Page 27: ...ocking mechanism is retracted 2 Release the button The ball locking mechanism is activated 3 Insert the pin in each storage and rigging hole Pull and rotate the pin The pin must remain inside the hole If the pin is inserted in two plates the ball must pass through both plates and lock the pin in place If the check fails immediately withdraw the product from use and contact L Acoustics KS28 owner s...

Page 28: ...Inspection and preventive maintenance Related tasks Rigging part inspection p 22 28 KS28 owner s manual EN version 1 0 ...

Page 29: ...are not worn out Screws are tightened Reference pictures KS28 ground runner and corner stops KS28 corner stop KS28 OUTRIG runner Contact your L Acoustics representative for repair instructions Related tasks Rigging part inspection p 22 KS28 owner s manual EN version 1 0 29 ...

Page 30: ...d mechanically inspect the grill safety Moving parts Procedure 1 Make sure that the O rings are not damaged 2 Make sure that the screw is tightened 3 Pull on the O rings Make sure they do not break Make sure they are not loose 30 KS28 owner s manual EN version 1 0 ...

Page 31: ...ging arm is removed from its storage position with some resistance b When pushing and sliding the mechanism the spring loaded pin is retracted with some resistance c Upon release the spring loaded pin quickly returns to its initial position d The yellow labels on the rigging arm and on the spring loaded pin are visible when the rigging system is not locked not locked KS28 owner s manual EN version...

Page 32: ... when the rigging system is locked locked 2 Hold the top enclosure by the handles and shake the assembly The two enclosures remain attached 3 Unlock the rigging system on both sides 4 Switch the enclosures and repeat the procedure 32 KS28 owner s manual EN version 1 0 ...

Page 33: ...age or air leak visually inspect the grill gasket cabinet and connector plate for loose missing or damaged parts Connection Use only 10 m 30 ft 4 mm AWG 11 speaker cables Do not connect enclosures in parallel Ampli ed controllers Load a preset corresponding to the connected loudspeaker s family Presets from the user memories may be used on condition they are made of presets supported in the embedd...

Page 34: ...tes are met in particular that the loaded preset corresponds to the connected speaker s family b inspect the cables and connections c go to step 8 p 34 8 Under NC NOK and UNDEF results press and hold the corresponding OUT key The ampli ed controller displays the tested frequencies information on the measured impedance OPEN for open circuit found in NC results SHORT for short circuit found in NOK r...

Page 35: ...licking muf ed or weak sound Possible causes The screws are not tightened with the appropriate torque There is an air leak in the gasket There is dust on the cone The cone is damaged The surround is torn or delaminated The voice coil or the spider is damaged Procedure 1 Perform the speaker disassembly procedure 2 Visually inspect the cables and the connectors 3 Visually inspect the speaker cone th...

Page 36: ...ries KS28 PLA optional KS28 CHARIOT optional min number of operators 2 Assembly Procedure 1 Engage both brakes on KS28 CHARIOT 2 Place KS28 on KS28 CHARIOT and connect the two elements on both sides SHLAK 3 Place another KS28 on the assembly Align the runners with the tracks 36 KS28 owner s manual EN version 1 0 ...

Page 37: ...ntil the stack is complete Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 6 Disengage the brakes and position the stack at its nal position 7 Block the stack using both brakes KS28 owner s manual EN version 1 0 37 ...

Page 38: ...of falling objects Verify that no unattached items remain on the product or assembly Assembly Procedure 1 Place one KS28 on its side Enclosure position In standard con guration the logos on both enclosures must be on the same side In cardioid con guration the logos must be on opposite sides 2 Place another KS28 on the rst one Make sure the side runners t together 38 KS28 owner s manual EN version ...

Page 39: ... Use the holes next to the pick up points to implement a secondary safety Refer to KS28 BUMP p 13 Consider using LA SLING2T Risk of falling objects Verify that no unattached items remain on the product or assembly Assembly Procedure 1 Secure two chains to the selected pick up points on KS28 BUMP 2 Lift the assembly 3 Position a stack of KS28 under the pickup point See Stacking KS28 vertically p 36...

Page 40: ...top enclosure on both sides 5 If KS28 is stacked on KS28 CHARIOT remove the rigging arms from the chariot before lifting Final check Visually check that no yellow labels are visible Manually check that all linking points are secured 40 KS28 owner s manual EN version 1 0 ...

Page 41: ... Risk of collision Do not stand close to the array when lifting the enclosures 6 Lift the assembly and remove the chariot 7 Position another KS28 or KS28 stack under the pickup point KS28 owner s manual EN version 1 0 41 ...

Page 42: ...on both sides Align the runners and the tracks SHLAK 9 Repeat steps 5 p 40 to 8 p 42 until the array is complete Final check Visually check that no yellow labels are visible Manually check that all linking points are secured Risk of collision Do not stand close to the array when lifting the enclosures 10 Lift the array to its nal position 42 KS28 owner s manual EN version 1 0 ...

Page 43: ...r the array Prepare KS28 CHARIOT Make sure the KS28 CHARIOT brakes are not engaged Make sure the KS28 CHARIOT rigging arms are in the open position Proceed slowly when lowering the array 2 Lower the array until it rests on KS28 CHARIOT KS28 owner s manual EN version 1 0 43 ...

Page 44: ... to KS28 CHARIOT SHLAK 4 Disconnect a stack from the array on both sides Make sure both linking points are disconnected before lifting the array 5 Lift the assembly and put the stack aside 6 Repeat the procedure 44 KS28 owner s manual EN version 1 0 ...

Page 45: ... the footnote LA2Xi LA12X per output total per output total KS28 1 4 SE 1 1 PBTL 1 4 Cabling schemes for KS28 LA2Xi Refer to the cabling schemes to connect the enclosures to different types of output connectors Refer to the LA2Xi owner s manual for more information on output con gurations Terminal block output SE 1 1 2 5 mm cables Terminal block output PBTL 1 2 3 4 2 5 mm cables For passive loudsp...

Page 46: ...the cabling schemes to connect the enclosures to different types of output connectors Two channel speakON output SP SP SP Y1 CC4FP CH 1 CH 2 1 1 2 2 Four channel CA COM output DO SP DOSUB LA8 SPK1 SPK2 SPK3 SPK4 DO SP DO3WFILL 2WAY SUB2 SUB1 46 KS28 owner s manual EN version 1 0 ...

Page 47: ...ACOM T10 Torx bit EX 110 FACOM torque screwdriver 2 10 N m A 404 FACOM Included in the L Acoustics Maintenance Toolcase Maintenance Toolcase The Maintenance Toolcase is a carry on suitcase that includes all the tools required to perform maintenance on L Acoustics products This toolcase is aimed at Certi ed Providers The Maintenance Toolcase uses a Peli 1510 Protector case that features three pre c...

Page 48: ...Corrective maintenance Disassembly and Reassembly procedures In order to operate follow the order outlined here Grill KR SECUGRL LF loudspeaker G03229 48 KS28 owner s manual EN version 1 0 ...

Page 49: ...ension at screwdriver Repair kits KR SECUGRL Kit 100 safety O rings for front grill 100 1 100557 100226 grill safety O ring grill safety tool Prerequisite The enclosure is placed on its rear Disassembly Procedure 1 Loosen the captive grill screw 5 mm KS28 owner s manual EN version 1 0 49 ...

Page 50: ...ecured with an O ring pull it down before removing the grill Reassembly Procedure 1 Slide the O ring under the captive screw insert Use a at screwdriver to push the O ring under the insert 2 Apply blue threadlocker on the captive screw 50 KS28 owner s manual EN version 1 0 ...

Page 51: ...Corrective maintenance 3 Position the grill starting with the top 4 With the 100226 stretch the O ring and pull it above the captive screw KS28 owner s manual EN version 1 0 51 ...

Page 52: ...Corrective maintenance 5 Secure the grill with the captive screw Use the 5 mm hex bit and set the torque to 3 N m 3 N m 5 mm 52 KS28 owner s manual EN version 1 0 ...

Page 53: ... 30 hex 18 speaker gasket Prerequisite Grill disassembled See D R Grill p 49 Exploded view For safety reasons always use the new screws and spare parts provided in the KR If no new screws are available use blue threadlocker Gradually tighten the screws following a star pattern Check that the cable tie is intact 5 N m x8 5 mm KS28 owner s manual EN version 1 0 53 ...

Page 54: ...x L Vents Nominal impedance 4 Ω Connectors IN 1 4 point speakON Rigging and handling ush tting 2 point rigging system 6 ergonomic handles 2 ground runners 8 side runners Weight net 79 kg 174 lb Cabinet premium grade Baltic beech and birch plywood Front coated steel grill acoustically neutral 3D fabric Rigging components high grade steel Finish dark grey brown Pantone 426 C IP IP55 1 Peak level at ...

Page 55: ...Speci cations KS28 dimensions 1340 mm 52 8 in 1351 mm 53 2 in 719 mm 28 3 in 550 mm 21 7 in 565 mm 22 2 in 702 mm 27 6 in KS28 owner s manual EN version 1 0 55 ...

Page 56: ... x KS28 2 Ø19 mm shackles WLL 3 25 t Weight net 15 5 kg 34 2 lb Material high grade steel with anti corrosion coating KS28 BUMP dimensions 1340 mm 52 8 in 650 mm 25 6 in 1200 mm 47 2 in 530 mm 20 9 in 1080 mm 42 5 in 81 mm 3 2 in 100 mm 3 9 in 56 KS28 owner s manual EN version 1 0 ...

Page 57: ...ons KS28 PLA speci cations Description Removable front dolly on wheels for 1 x KS28 Weight net 14 kg 30 8 lb KS28 PLA dimensions 146 mm 5 8 in 550 mm 21 7 in 1340 mm 52 8 in KS28 owner s manual EN version 1 0 57 ...

Page 58: ...i cations KS28 CHARIOT speci cations Description Chariot for up to 4 x KS28 Weight net 53 5 kg 118 lb KS28 CHARIOT dimensions 230 mm 9 1 in 813 mm 32 in 1450 mm 57 1 in 58 KS28 owner s manual EN version 1 0 ...

Page 59: ... high grade steel with anti corrosion coating Weight net 3 7 kg 1 2 lb Lifting chain DIN EN 818 4 2 leg 8 mm Steel grade 8 Nominal length incl hooks 1000 mm 39 4 in Maximum sling angle βmax 60 Load rating 2 8 t for β 0 45 2 t for β 46 60 LA SLING2T illustration KS28 owner s manual EN version 1 0 59 ...

Page 60: ...w provides the recommended maximum length for loudspeaker cables depending on the cable gauge and on the impedance load connected to the ampli er recommended maximum length cable gauge 8 Ω load 4 Ω load 2 7 Ω load mm 2 SWG AWG m ft m ft m ft 2 5 15 13 30 100 15 50 10 33 4 13 11 50 160 25 80 17 53 6 11 9 74 240 37 120 25 80 Use the more detailed L Acoustics calculation tool to evaluate cable length...

Page 61: ...L Acoustics 13 rue Levacher Cintrat 91460 Marcoussis France 33 1 69 63 69 63 info l acoustics com www l acoustics com ...

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