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EVAC50W24V Amplifier



Reprogramming Input 2's default tone

Changing input 2's default tone of 3 to tone 12


Configuration switches demonstration

Demonstrating the EVAC50W24V's four config switches


Class Change duration

How to change the EVAC50W24V's class change tone duration time

Config Jumper assignments

LK 1 – disable bell input requirement
With Config Link LK1 fitted, the amplifier activates without the need of a bell signal when activating inputs 1, 2 or 3. Applying a ‘Bell on’ condition with Config Link LK1 fitted and any input active or inactive results in the amplifier activating tone 1 With the LK1 omitted, a bell ‘on’ signal and activation of an input is required to turn on the amplifier. RS485 LED activations work as normal.

LK 2 – enable Class Change (School Bell mode)
With Config Link LK2 fitted, class change for input 3 is enabled (eliminating the previous programming requirement) and remains enabled when the ‘Silence Alarms’ (BCO) is active. Class Change can also be activated via RS485 LED mapped activation Amplifier LED base address +2. With LK2 omitted class change is not enabled. Tone burst length still needs to be programmed as described in the manual with the 1’s dial set to 5 (not 7 as for earlier firmware versions).

LK 3 – Disable Amplifier
With Config Link LK3 fitted, activating inputs 1 or 2 will activate the amplifier, provided input 3 is not active. With Config Link LK3 fitted, activating input 3 results in disabling the amplifier (which also prevents class change operation if LK2 were fitted). With Config Link LK3 fitted, activating Amplifier LED base address +2 also results in disabling the amplifier.

LK 4 – LCD address mode
With Config Link LK4 fitted, the Amplifier is polled as an LCD mimic instead of as an LED mimic and responds to LED mapped RS485 activation of Amplifier. This is to overcome the limitation of the maximum 8 polled LED mimic addresses and so allows up to 16 polled amplifiers, 8 as LED mimics and 8 as LCD mimics. Any defect from an amplifier set as LCD mimic is signalled as ‘LCD mimic address missing’ defect by the panel.

Fault Table

Fault Bell Circuit Monitor RS485 Message Fault LED
DC Power Supply Missing EOL clamped to 4kΩ LED Mimic xx Missing OFF
DC Power Supply 'Off Normal' EOL clamped to 4kΩ LED Mimic xx Fault Int. 1st  Flash Long
Amplifier Output Low or Overload Fault, or MJ6 not fitted EOL clamped to 4kΩ LED Mimic xx Fault Int. 2nd  Flash Long
100V 10kΩ EOL Fault EOL clamped to 4kΩ LED Mimic xx Fault 3rd  Flash Long
RS485 Communication Fault EOL clamped to 4kΩ LED Mimic xx Missing 4th  Flash Long
DC Power Supply 'Off Normal' Fault Normal Normal 5th  Flash Long
Amplifier Output Low or Overload Fault History or MJ6 not fitted Normal Normal 6th  Flash Long
100V 10kΩ EOL Defect Fault Normal Normal 7th  Flash Long
RS485 Communication Fault History Normal Normal 8th  Flash Long
Amplifier Isolated EOL clamped to 4kΩ LED Mimic xx Fault 9th Flash Long

Bell Mode

The BELL circuit may operate in one of two modes configured by link MJ5 labelled 'BELL MODE'.
NORM: with the link placed in the normal position, a positive voltage on the BELL input activates the amplifier. When an ‘Off-Normal’ condition occurs the amplifier changes the BELL circuit EOL resistor value.
CCNC: with the link in the 'CCNC' position, the BELL input becomes a Clean Contact, Normally Closed relay output for external defect monitoring. Voltage must not be applied to the BELL input in CCNC mode because the normally-closed contact is a short circuit.

Tone Selection Table