LINE MONITORING & AMPLIFIER CHANGEOVER
Amplifier Changeover : Auto and manual versions of standby amplifier fault changeover are available to ensure continuous and uninterrupted operation of system.
Line Monitoring : Auto speaker line monitoring for 8 and 16 zones and also rack mounted amplifier monitoring panel.
Speaker line monitoring which detects fault in speaker circuits and changeover panel for standby amplifier takeover of failed duty units are features required to comply with EN54 and BS5839 Part 8 standards, as well as other localised regulations.
Amperes has what are required to perform those functions, as tabulated below.
AM4120 : 12 Ch Amplifier Monitor Panel
AS4000 : Amplifier Surveillance Module
STANDBY AMPLIFIER CHANGEOVER UNIT
AC3801 : 8 Duty / 1 Standby Manual Changeover Unit
AX3800 : 8 Duty / 1 Standby Auto Changeover Unit
Speaker Line Monitoring
LS4808 / LS4816
8/ 16 Channel Speaker Line Surveillance
LS4808 and LS4816 are all new speaker line monitoring unit, replacing the long running LS4600. Now available in 2 versions ; 8 and 16 channels types.
With their new processor and measurement algorithm, they are now able to perform tasks faster with better accuracy. Additional features included were trigger monitoring, which can be linked to timer for preset times activation.
Similar to its previous model, they provide reliable speaker circuit monitoring for ground leakage, short and open circuit using impedance measurement method, thus eliminating the use of blocking capacitors and end line resistors.
12 Channel Amplifier Monitor Panel
It is used to monitor amplifier audio outputs installed at rack for 70 and 100V line amplifiers. AM4120 comes with LED level meter and 1W speaker, catering for 12 amplifier outputs.
It is used to facilitate output level calibration of each output of the power packs and also to listen to the sound at rack, without having to run to the zone for checking.
Amplifier Monitor Module
AS4000 is used to monitor the status of 70 / 100V line power amplifiers which do not have built in detection module. Each AS4000 shall be connected to individual power pack and dry contact from it shall be used to activate a changeover of AC3801 when failure is detected. This contact may also be used for other purpose.
Standby Amplifier Changeover Unit
8 duty / 1 standby Manual Amplifier Changeover Unit
AC3801 succeeded its predecessor AC3601 and AX700, and now is presented as a combination of the two models in one unit with additional inputs for duty amplifiers. It is now with 8 duty / 1 standby, comes with priority changeover and cascade feature.
It has option for manual changeover or auto for amplifiers with fault detection contacts.
8 duty / 1 standby Auto Amplifier Changeover Unit
AX3800 is 8 duty / 1 standby auto changeover unit , providing a switching platform for standby unit to replace the position of failed duty amplifier. Should one standby unit is required to serve more than 8 power packs, more than one AX3800 can be cascaded.
It provides switching both at input and output section, thus suitable for matrix system where all amplifiers has different input sources. Detection is via 20 KHz, which is inaudible to human ears.
While it is compatible for most makes of amplifiers, please check the specifications of the amplifiers as they may have high frequency cut off, which would make the overall changeover functions unstable.