background image

PAGE 10

LS4808 / LS4816 | 8 / 16 CHANNEL SPEAKER LINE SURVEILLANCE

Notes On Speaker Line Impedance

In reality, impedance of a speaker circuit consists of Resistance (normally cable) and Capacitance and Inductance 

(speaker coils).

                                                                    Z = R + Indu Capacitance

Using a multimeter (pure resistance measurement) to measure a speaker circuit is not the accurate tool to determine the 

value to calculate the total load of the line, which they are not capable to measure the Capacitance or Inductance of 

cable and speaker coils.

In circuit with branching, a break at point        would not trigger an ‘open circuit’ alarm, and a short at point        would not 

trigger ‘short circuit’ indication as these still exist some impedance due to cable resistance.

LS4808 / 4816 has unique way to detect faults, there by using basic mode, creating an impedance limit range and for 

more sensitive detection, set the unit to ‘advance’ mode. 

A

B

B

A

A

Impedance 

meter

----

Ø

Branch

R

L / C

L / C

VC

--

Содержание LS4808

Страница 1: ...pedance measurement method which allows flexibility in speaker cablings such as branching and does not require end line resistors or blocking capacitors at the speakers Its RS485 data output enable re...

Страница 2: ...ly if other than PS9400 is installed 6 24V DC POWER SUPPLY PORT SPEAKER LINE SURVEILLANCE LS 4816 amperes PRE CH 1 CH 2 CH 4 CH 3 CH 5 CH 6 CH 7 CH 8 ZONE SPEAKER CHANNEL CH 9 CH 10 CH 12 CH 11 CH 13...

Страница 3: ...at every zone shall have its own 24V overriding circuit back to the rack If all the overriding circuits are looped and if the particular zone with volume controller is set to off the monitoring activi...

Страница 4: ...does not need end line resistors as well as speaker capacitor couplings It is recommended that periodical manual checking or setup to be made as connections may deteriorate over time and thus affecti...

Страница 5: ...ONE 8 COM 100V ZON 8 COM ZON 7 100V AMP 7 COM 100V COM AMP 8 100V ZONE IN AMP 1 FAULT O P CONTACT AMP 16 EXT TRIGGER RS485 100V LINE ZONE 1 ZONE O Ps LS4816 ZONE 16 SPEAKERS TRIG O Ps VOL O RIDE MAX 3...

Страница 6: ...ton for EXIT 1 SETUP 2 ADVANCE SETUP PREV NEXT CHANNEL 01 OPEN MONITORED CHANNEL 01 OPEN BYPASS Press Next Prev button to switch the Channel CHANNEL 01 OPEN LOW LIMIT 0005 CHANNEL 01 OPEN HIGH LIMIT 0...

Страница 7: ...it ENTER to confirm ENABLE DISABLE buzzer 1 SETUP 1 BASIC SETUP PREV 1 SETUP 5 EXIT 1 SETUP ENTER CHANNEL 01 BP FAULT YES NO 4 CH BP ON FAULT NEXT PREV ENTER to confirm YES NO 1 SETUP 1 BASIC SETUP CH...

Страница 8: ...DISABLED Press Next Prev button to select ENABLED DISABLED If a test interval is selected from 1 min 24 hour By default auto mode is set to off Use NEXT PREV button to select time 3 Auto Test MAIN MEN...

Страница 9: ...LS4816 To show the Model 4 SYSTEM 3 FIRMWARE V1 03 To show the Firmware NEXT 4 SYSTEM 4 EXIT ENTER MAIN MENU 4 SYSTEM Return to MAIN MENU NEXT MAIN MENU 5 SAVE EXIT After completing all setting the c...

Страница 10: ...e value to calculate the total load of the line which they are not capable to measure the Capacitance or Inductance of cable and speaker coils In circuit with branching a break at point would not trig...

Страница 11: ...nimizing interruption to PA operation User setting for detection sensitivity for open short and leakage Aux 24V DC output for volume controller overriding during testing mode LS4808 LS4816 24V DC via...

Страница 12: ...erformed by unauthorized personnel or service centres This warranty covers only repairs and replacement of defective parts cost and risks of transportation as well as removal and installation of the p...

Отзывы: