Electro-Voice | LML-1 v2

LML-1 v2

▪ Permanent supervision of loudspeaker lines

▪ Represents tuned and defined load at 20 kHz

▪ High accuracy supervision even on long cable runs

▪ For 100 V loudspeaker lines powered by amplifiersup to 1000 W

▪ EN 54-16: 2008

The LML-1 can be used with all Electro-Voice CPSSeries multi channel amplifiers in 100 V line mode forloudspeaker line supervision. These amplifiers provide,together with RCM-810 modules, a convenientloudspeaker line supervision based on impedancemeasurement. The impedance of a loudspeaker line,however, depends on many factors, such as cablelength, cable capacitance, speaker impedance,temperature, etc., and therefore can vary greatly. TheLML-1 is connected to the end of a 100 V loudspeakerline to generate stable conditions. At 20 kHz the LML-1represents a defined load, while having minimal loadover the normal audio frequency range. With theLML-1 thus the accuracy of the impedancemeasurement is increased, and broken or shortedspeaker lines can be detected reliably even on longcable runs.

Technical specifications

Operating Voltage 100 V

Impedance 5 Ω at 20 kHz

Wiring Class 2

Connection 2 free wire ends for screwterminals

Product dimensions (Width ✕Height ✕ Depth)

80 ✕ 29 ✕ 59 mm

Operating temperature -5° to +45° C

Net weight 85 g

Shipping weight(includes 4 modules)

615 g

Filter

20 kHz

FuseThermal Fuse red cable

black cable

Speaker +

Speaker -

To amplifier

100V Line

Output

Jumper

JP1

JP2

JP3

JP4

Circuit diagram

220 ±10 mm

[ 8.7 ±0.4" ]

69 mm[ 2.72" ]

65 m

m[

2.5

6"

]

54 m

m[

2.1

3"

]29 m

m[

1.1

5"

]

80 mm[ 3.15" ]

Ø 4 m

m

[ Ø 0.16" ]

Dimensions

Certifications and approvalsEN 54-16: 2008

Installation/configuration notes

!

Warning!

Note the accompanying Safety Instructions.

The LML-1 must only be installed by trained

electricians or qualified service personnel.

Danger!

To protect against hazardous voltages, the

LML-1, including the terminals, must be moun-

ted in a case that can only be opened by use of

a tool (screwdriver or similar).

Make sure that the LML-1 is securely mounted

inside the enclosure. For metal enclosures it is

particularly important that the printed circuit

board and components do not come into con-

tact with the enclosure (risk of short-circuit!).

For the speaker leads Class 2 wiring must be

used.

To comply with British Standard BS5839:Part8

the LML-1 must be connected to the speaker

cable using a ceramic terminal block. It is the

installer’s responsibility to ensure that suitable

terminal blocks are used and that the LML-1 is

terminated correctly. Country specific safety

standards and local regulations/codes must be

adhered to.

Notice!

A thermal fuse is pre-fitted to the red con-

necting cable. Do not bend, solder, heat or

damage the fuse during installation.

Installation1. The LML-1 can be used with following amplifier types

(including RCM-810 module) only: DYNACORD DSA8405, DSA 8410, DSA 8805 or Electro-Voice CPS4.5,CPS4.10, CPS8.5.

2. Check that the loudspeaker line is not live beforeconnecting. If the line is connected to an amplifierensure that it is switched off.

3. Configure the LML-1 using jumpers JP1...4 for thelength and cross-section of the loudspeaker line (seediagrams below).

4. Fix the LML-1 at the end of the loudspeaker line usingthe self-adhesive mounting studs provided. If the finalloudspeaker in the circuit is a type with an accessibleenclosure, such as a ceiling speaker or wall mountspeaker, then it should be possible to mount the

LML-1 inside the enclosure. If the loudspeaker is ahorn type, or similar, mount the LML-1 in an externalconnection box (minimum dimensions 100 x 100 x 60mm).

5. Connect the red cable to the + side of theloudspeaker line. Connect the black cable to the -side of the loudspeaker line.

6. When the amplifier is operating at very high volumelevels the LML-1 can get quite warm. This is normal,but as a useful precaution care should be taken toavoid pinching cables over the components on thecircuit board when fastening the mounting enclosure.Cables or flammable materials should not touchcomponents of the LML-1.

Operation1. Set the output mode of the amplifier to 100 V (high

impedance mode, Direct Drive).2. Set the pilot tone frequency to 20 kHz and the pilot

tone level at 2.5-7.5 V (measured at the amplifieroutput) to get an accurate impedance measurement.

3. Add a low pass filter (14 kHz, 24 dB Linkwitz-Riley) tothe signal path in front of the amplifier input to avoidhigh signal levels at the LML-1.

4. It is recommended to use a DYNACORD P 64 orElectro-Voice N8000 for signal processing. Thesedevices allow easy configuration of the pilot tone andthe low pass filter for each channel using the IRIS-Netsoftware. The generator level to be set at the AO-1Pilot tone generator can be found in the diagramsbelow for different line lengths and cross-sections.

5. Check the current measured at the amplifier output inIRIS-Net. The current must be exactly 0.30 A. If thecurrent is too low/high, the generator level must beincreased/decreased.

6. Set the EOL CURRENT parameter in the Supervision &Test panel of the amplifier to 0.2 A.

7. Check the voltage value measured at the amplifieroutput in IRIS-Net, set the EOL VOLTAGE parameterto 85% of the measured value.

8. Use music as input signal for the amplifier channel.Increase the signal level to just below the limit/clipthreshold of the amplifier.

9. Check the maximum impedance value measured atthe amplifier output in IRIS-Net, set the HIGH THRESHparameter to 110% of the measured value.

10. Mute the input signal of the amplifier channel.11. Check the impedance value measured at the amplifier

output in IRIS-Net, set the LOW THRESH parameter to90% of the measured value.

12. Test the error indications EOL OPEN (bydisconnecting the LML-1) and EOL SHORTED (byshort-circuiting the LML-1).

13. If necessary the pilot tone level can be adjusted tooptimize the error indication.

* At high-power 100 V loudspeaker lines the fullrangeimpedance can be lower than the impedance at 20 kHzpilot tone. In this case the values of HIGH and LOWTHRESH parameters have to be swapped.** When using long-running 100 V loudspeaker lines ashortage can be indicated as „OPEN“, as theimpedance of a shorted line can be higher than theimpedance of a connected LML-1.

2 | LML-1 v2

Check the manuals of the devices and IRIS-Net formore details about setting up a line measurement. Acomprehensive description of this topic can berequested from the application design team (email:tobias.pirtsch@de.bosch.com)

Notice!

It is recommended to use the LML-1 only for

the supervision of 100 V speaker lines with

line lengths and cable diameters shown in

the diagrams below. With longer cables and

different cable diameters, the physical prop-

erties can lead to a monitoring by impedance

measurement reaches it limits and can not be

reliably ensured with an attached LML-1.

Jumper Cable Diameter: 2 x 0,5 mm² Line Length: up to 250 mJumper

15 0 dBuSetting No. JP1 JP2 JP3 JP4

15 1 1 1 1

14 1 1 1 0

13 1 1 0 1

12 1 1 0 0

11 1 0 1 1

10 1 0 1 0

9 1 0 0 1

8 1 0 0 0

7 0 1 1 1

6 0 1 1 0

5 0 1 0 1

4 0 1 0 0

3 0 0 1 1

2 0 0 1 0

1 0 0 0 1

0 0 0 0 0

Generator levels based on 36 dB amplifier gain: Electro-Voice CPS or Dynacord DSA multi-channel amplifiers in 100 V Direct Drive mode

30,0!dBu

29,0!dBu

28,0!dBu

27,0!dBu

26,0!dBu

25,0!dBu

24,0!dBu

23,0!dBu

22,0!dBu

21,0!dBu

20,0!dBu

19,0!dBu

18,0!dBu

17,0!dBu

16,0!dBu

15,0!dBu

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0,0!m 25,0!m 50,0!m 75,0!m 100,0!m 125,0!m 150,0!m 175,0!m 200,0!m 225,0!m 250,0!m

Jumper!Setting

Generator!Level

Jumper Cable Diameter: 2 x 1,0 mm²Setting No. JP1 JP2 JP3 JP4

15 1 1 1 1

14 1 1 1 0

13 1 1 0 1

12 1 1 0 0

11 1 0 1 1

10 1 0 1 0

9 1 0 0 1

8 1 0 0 0

7 0 1 1 1

6 0 1 1 0

5 0 1 0 1

4 0 1 0 0

3 0 0 1 1

2 0 0 1 0

1 0 0 0 1

0 0 0 0 0

Generator levels based on 36 dB amplifier gain: Electro-Voice CPS or Dynacord DSA multi-channel amplifiers in 100 V Direct Drive mode

Cable Diameter: 2 x 0,5 mm²

Line Length: up to 450 m

Line Length: up to 250 m

Jumper

30,0!dBu

29,0!dBu

28,0!dBu

27,0!dBu

26,0!dBu

25,0!dBu

24,0!dBu

23,0!dBu

22,0!dBu

21,0!dBu

20,0!dBu

19,0!dBu

18,0!dBu

17,0!dBu

16,0!dBu

15,0!dBu

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0,0!m 50,0!m 100,0!m 150,0!m 200,0!m 250,0!m 300,0!m 350,0!m 400,0!m 450,0!m

15 0 dBu

Jumper!Setting

Generator!Level

3 | LML-1 v2

Jumper Cable Diameter: 2 x 1,5 mm² Line Length: up to 600 mJumper

15 0 dBuSetting No. JP1 JP2 JP3 JP4

15 1 1 1 1

14 1 1 1 0

13 1 1 0 1

12 1 1 0 0

11 1 0 1 1

10 1 0 1 0

9 1 0 0 1

8 1 0 0 0

7 0 1 1 1

6 0 1 1 0

5 0 1 0 1

4 0 1 0 0

3 0 0 1 1

2 0 0 1 0

1 0 0 0 1

0 0 0 0 0

Generator levels based on 36 dB amplifier gain: Electro-Voice CPS or Dynacord DSA multi-channel amplifiers in 100 V Direct Drive mode

30,0!dBu

29,0!dBu

28,0!dBu

27,0!dBu

26,0!dBu

25,0!dBu

24,0!dBu

23,0!dBu

22,0!dBu

21,0!dBu

20,0!dBu

19,0!dBu

18,0!dBu

17,0!dBu

16,0!dBu

15,0!dBu

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0,0!m 50,0!m 100,0!m 150,0!m 200,0!m 250,0!m 300,0!m 350,0!m 400,0!m 450,0!m 500,0!m 550,0!m 600,0!m

Jumper!Setting

Generator!Level

Jumper Cable Diameter: 2 x 2,5 mm²Setting No. JP1 JP2 JP3 JP4

15 1 1 1 1

14 1 1 1 0

13 1 1 0 1

12 1 1 0 0

11 1 0 1 1

10 1 0 1 0

9 1 0 0 1

8 1 0 0 0

7 0 1 1 1

6 0 1 1 0

5 0 1 0 1

4 0 1 0 0

3 0 0 1 1

2 0 0 1 0

1 0 0 0 1

0 0 0 0 0

Generator levels based on 36 dB amplifier gain: Electro-Voice CPS or Dynacord DSA multi-channel amplifiers in 100 V Direct Drive mode

Cable Diameter: 2 x 1,5 mm² Line Length: up to 600 m

Line Length: up to 700 mJumper

30,0!dBu

29,0!dBu

28,0!dBu

27,0!dBu

26,0!dBu

25,0!dBu

24,0!dBu

23,0!dBu

22,0!dBu

21,0!dBu

20,0!dBu

19,0!dBu

18,0!dBu

17,0!dBu

16,0!dBu

15,0!dBu

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0,0!m 50,0!m 100,0!m 150,0!m 200,0!m 250,0!m 300,0!m 350,0!m 400,0!m 450,0!m 500,0!m 550,0!m 600,0!m 650,0!m 700,0!m

15 0 dBu

Jumper!Setting

Generator!Level

Parts included

Quantity Component

4 LML-1

16 Self-adhesive mounting studs

1 Data sheet

1 Important safety instructions

Ordering informationLML-1 v2Line measuring loadOrder number F.01U.266.132

4 | LML-1 v2

Represented by:

Bosch Sicherheitssysteme GmbHRobert-Bosch-Ring 585630 GrasbrunnGermany

www.electrovoice.com

© Bosch Security Systems 2014 | Data subject to change without noticeDocument Number F01U268895 | Vs2 | 05. Aug 2014