Edwards EST-3 Life Safety System

Real time voice coverage: Authorized operators can use fire telephones or dedicated microphones to call out to the entire area or selected areas.

Text/graphic prompts: Combined with the graphic workstation (EST-3 Workstation), evacuation guidelines, weather warnings, etc. can be displayed on the large screen.

It is crucial to quickly issue targeted instructions to different areas in scenarios such as school shootings, terrorist attacks, or natural disasters. The audio system of EST-3 allows the security center to trigger a "lockout mode" with one click (such as locking all doors, closing curtains, playing a "hidden standby" message), while the fire alarm area can still be independently evacuated.

3.3 Troubleshooting of Audio System Malfunctions

Fault phenomenon 1: Some speaker circuits have no sound.

Possible reasons: amplifier output overload, line short circuit, or loss of terminal resistance.

Solution steps:

Use the panel diagnostic function of EST-3 to check the status LED of the audio amplifier module.

Measure the resistance of the speaker circuit (normally between 4 Ω and 16 Ω or in accordance with the terminal resistance value). If there is a short circuit, remove the damaged points of the circuit in sections.

Check if the correct terminal resistor (EOL resistor) is installed at the end of the circuit.

Fault phenomenon 2: Audio message crosstalk (A area hears broadcast from B area).

Possible cause: Audio routing programming error.

Solution: Check the "Audio Group Allocation" table in the EST3 Programmer software to ensure that the logical group number corresponding to each output area is correct. Additionally, confirm that the physical audio bus did not accidentally connect multiple signals from different regions in parallel.

Signature Series Detector: Dual purpose for Fire and Security

4.1 Multi sensor intelligent detection

The Signature series detectors are the core front-end devices of the EST-3 ecosystem. They are not only used for fire alarm, but also for security detection (such as door and window magnetic switches, passive infrared, etc.), and all devices can share the same pair of signal lines (SLC circuit). This greatly simplifies the wiring work for the renovation of old buildings.

The Signature smoke detector is equipped with multiple sensing elements (photoelectric, thermistor, and some models include carbon monoxide sensors), which can effectively distinguish:

Real smoke (slow burning, smoldering, open flame)

False alarm sources such as cooking fumes, dust, and water vapor

Detector contamination level (automatic report requires cleaning)

Its performance is excellent in UL 268 fire sensitivity test, especially in response to polyurethane foam fire (difficult fire source).

4.2 Equipment Maintenance and Diagnosis

The PC tool of EST-3 can generate detailed system reports, including Signature Device Connection Mapping Diagram, which intuitively displays the SLC circuit address, installation location, and real-time pollution level of each detector. By utilizing this feature, maintenance personnel can develop predictive cleaning plans instead of waiting for false alarms or malfunctions to occur.

Common maintenance operations:

Use a dedicated vacuum cleaner accessory to clean the maze chamber of the detector (do not use compressed air to prevent dust from blowing into the light chamber).

For detectors with a pollution level higher than 80%, they should be removed for ultrasonic cleaning or replaced directly.

Regular drift compensation testing of sensitivity: EST-3 automatically records changes in detector baseline, but functional testing should be conducted using standard aerosols every 2 years.

4.3 Security Function Integration

The Signature series also includes door magnets, glass breakage detectors, passive infrared and dual technology detectors. These devices can be connected to EST-3 through the same SLC circuit, and security events (such as door magnets being illegally opened) can share the same set of linkage rules with fire alarm events. For example, if a door magnetic anomaly is triggered during off hours, the system can automatically call nearby cameras (through IP integration) and trigger an audio warning for the area: "Please note that you have entered a restricted area

Network and system level troubleshooting

5.1 Ring Network Open/Short Circuit Handling

As mentioned earlier, the EST-3 network has automatic fault isolation capability. But when the following situations occur, manual intervention is still required:

Possible causes and solutions for the fault phenomenon

Check the power supply and fuses on the panel of a single node offline (other nodes are normal) due to power failure, damage to the ring network port, or loose wiring; Measure the voltage between the ring network ports with a multimeter (normally around 5V DC); Replace the damaged port module

All nodes experience intermittent packet loss and the total length of the ring network exceeds the limit of 300000 feet, or severe signal attenuation is caused by the use of fiber optic repeaters; Check the cable type (recommended shielded twisted pair cable with impedance of 120 Ω must be used); Split into multiple sub rings