Fire Interface with Rolling Shutters: How the Alarm Panel Closes the Shutter, and Who Tests It

Short answer: the fire interface is the signal path from the fire alarm panel to the shutter's motor controller. The panel closes a dry relay contact on alarm, the controller reads it ahead of every other command, and the shutter runs to its set position on battery if the mains is gone. The alarm contractor, the shutter contractor and the building owner each own a part.

Key takeaways

• The link is a relay contact from the fire panel. It carries no voltage of its own, so the two systems stay electrically separate.
• The alarm contractor owns the panel output. The shutter contractor owns the controller input. Someone must own the cable between them. Agree who before work starts.
• Decide the safe position first: closed, or open for escape. Then wire and test to that.
• Backup power is part of the interface. A dead battery in a 45 C plant room means no movement in a power cut.
• The only test that counts is a witnessed run from the real alarm, recorded and repeated every year.

How does a rolling shutter connect to the fire alarm panel?

Through a chain of four parts. When a detector trips, the panel decides it is an alarm. An output module, often called a relay or interface module, closes or opens a dry contact. A cable carries that to a fire input on the shutter control panel. The controller then overrides every remote, button and timer, and drives the motor.

That is the whole subject. Whether the curtain itself is fire rated, what documents to ask a supplier for and how approval works is in our guide to fire integrated shutters. On this page we stay on the signal, the motion and the test.

What does "drop to close" actually do?

On alarm the shutter runs to its set safe position without anyone pressing anything. For a compartment shutter that means down. The sequence should be the same each time.

1. The panel closes the contact.
2. The controller ignores the remote, the wall button and the timer.
3. The motor lowers the curtain at its set speed, or the brake releases so the curtain descends under control.
4. The safety edge and sensors still work. If the edge touches something, the controller follows the rule written in the design. Some designs stop and wait, some keep going. The consultant decides which.
5. The curtain reaches the floor and stays there until someone resets it after the alarm is cleared.

Some designs close in two stages. They come down to a set height to give people time to leave, then close fully. Whether that is allowed on your opening is a question for the consultant, not the installer.

If you are connecting a shutter that is not fire rated, for example a shop shutter that should close on alarm to limit smoke spread, the movement is the same. Our automatic rolling shutters use a controller that can take a fire input. Tell us the model and we will confirm what that controller accepts. The same question applies to double skin insulated rolling shutters and to residential rolling shutters.

Normally open or normally closed: how should the contact be wired?

Most panels offer both. A circuit that is normally closed and opens on alarm is safer, because a cut cable looks the same as an alarm. The shutter then moves rather than silently failing. Use the rules below.

1. If the controller supports a supervised input, use it. A broken wire or a loose terminal then raises a fault.
2. If the contact is normally open, add a monitored circuit or accept that a cut cable will not be noticed. Say so in writing.
3. If the shutter should open on alarm for escape, wire it the same way, but check that the manual release and the door beside it still work.
4. If the controller has no fire input, do not parallel it with the wall button. Replace or upgrade the controller.

Field note: the fault we find first is a terminal that was tightened once and never checked again. Heat expands and contracts it every day. A loose fire input looks fine on a bench test and fails the first time a real contact is needed.

Does the shutter still work in a power cut or when the alarm cuts the power?

It should, and that is what the backup battery or UPS is for. A fire alarm often goes with a mains loss, because the building cuts a circuit or the grid dips in a summer storm. If the controller needs mains to move the curtain, the shutter stays open. See our short answer in the FAQ on rolling shutter manual override in a power cut.

• Battery size: ask how many closing cycles it runs from fully charged, not just "it has a battery".
• Heat: a battery in a roof void or a plant room at 45 to 50 C loses capacity faster than one in a cool room. Check it before summer.
• Charger: a battery that is never charged is not backup. Check the charger light.
• Brake release: some designs release the brake on loss of power so the curtain falls under control. That avoids needing a battery to close, but it must be a controlled descent.

For other doors and gates, see how barriers behave in a power failure.

How does the manual release work, and how do you reset after an alarm?

The manual release lets a trained person raise or lower the shutter by hand if the motor cannot run. After the alarm clears, a person resets the controller, checks the area and returns the shutter to normal. Never reset before the fire officer or building manager says the alarm is cleared.

1. Confirm the alarm is cleared and the panel reset.
2. Look under the curtain. Clear anything in the path.
3. Reset the controller as instructed on the label.
4. Run the shutter up and down once, with someone watching.
5. Note the event and the reset in the log.

Who is responsible for the fire interface: alarm contractor, shutter contractor or building owner?

Nobody, in too many buildings. The interface sits on the boundary between two trades, so each assumes the other tested it. A one-page list fixes this.

Ajman and Sharjah units often have a landlord, a tenant and a separate maintenance company. Write the names against each row. If your unit is in a community or free zone, ask your community management whether they hold the alarm contract.

How do you test the shutter fire interface?

Run the shutter from the real alarm, with the right people present. A test with a screwdriver across two terminals is useful for finding faults, but it does not prove the alarm path.

Prepare first:

• Tell the building occupants and, if needed, the monitoring station that a test is planned.
• Clear the path under the curtain and the area around the controller.
• Check the battery charge and the manual release before you start.
• Book the alarm contractor and the consultant if the test must be witnessed.
• Choose a time that does not stop the business. Shops and warehouses in Ajman Industrial Area and Sharjah often prefer early morning or Friday. Ask about Ramadan hours.

Then the test script:

1. Start with the shutter open and the mains on. Trigger the alarm from the panel. Note the time to close.
2. Reset. Switch the mains off at the shutter supply. Trigger the alarm again. The shutter should still move.
3. Reset. Test the manual release.
4. Simulate a cut cable on the fire input, where supervised. The panel or controller should show a fault.
5. Reset, run normally, and record: date, who attended, each result and any fix.

Fire interface faults: symptom, cause and action

For repairs, see rolling shutter repair. For a new shutter with the interface set up at install, see rolling shutter installation.

Worked example: a 5 m wide shopfront shutter that should drop on alarm

This is an illustration, not a QNAD job. A mall service opening is 5 m wide and 3.5 m high. The consultant wants the shutter to close on alarm. The curtain moves at 0.15 m per second, so a full drop takes about 23 seconds from the open position.

1. The alarm contractor supplies a relay output module in the same zone. The shutter contractor receives a labelled dry contact.
2. The cable run is 40 m. The two companies agree that the alarm contractor owns the cable and both ends are labelled.
3. The controller has a supervised input. A cut cable raises a fault on the controller.
4. The battery runs a number of closing cycles stated on the data sheet. The team tests one full drop on battery.
5. The witnessed test records the drop time, the battery test, the manual release and the fault test. It is filed.

The same shutter installed with no owner for the cable would have worked on day one. It would also have silently failed the first time someone moved a ceiling tile and pulled a terminal. A recent installation record shows how we handle the motor side: rolling shutter motor installation in Umm Al Quwain. It describes motor selection, secure fitting and reliable day-to-day performance. It does not describe an alarm link.

Fire interface myths and mistakes

When to stop and call a technician

Do not strip, bridge or jumper the fire input to stop a nuisance closing. Do not open the motor cover or the brake. Do not reset a shutter that closed on a real alarm until you are told the alarm is cleared. Call +971 50 495 3512 if the shutter moves with no alarm, fails to move on test, or sits half way. Keep people and vehicles away from the opening.

Fire interface terms in Arabic and English

Frequently asked questions

What is a fire interface on a rolling shutter?

It is the connection between the fire alarm panel and the shutter controller. The panel closes a dry contact on alarm and the controller drives the shutter to its safe position. Our fire interface FAQ gives the short version.

What is a potential free contact?

It is a relay output that only opens or closes a circuit and has no voltage of its own. The fire alarm and the shutter stay electrically separate, which avoids one system damaging the other.

Should the shutter open or close when the alarm sounds?

That depends on the opening. A shutter on a compartment line usually closes. One on an escape route may need to open. The fire consultant sets this in writing. The installer wires and tests to it.

Can an existing shutter be connected to the fire alarm?

Often yes, if the controller has a fire input or can be upgraded. Send the motor plate and controller photos as photos. An older controller may need replacing.

Who pays for and owns the cable from the fire panel to the shutter?

It should be agreed in writing before work starts. Often the alarm contractor runs it and the shutter contractor terminates it. Without an owner, nobody tests or repairs it.

How often should the interface be tested?

Test it at handover, at least yearly after that, and after any repair or building work near the shutter. Keep dated records. Ask your consultant or authority whether they want a different interval.

Can the shutter be connected to a building management system or home automation?

Often yes, through a separate relay or input. That is separate from the fire input, and the fire signal keeps priority. See our guide to the automation interface for automatic doors.

What happens to the shutter in a summer storm power dip?

A short dip can reset a weak controller or drain an old battery. Test a closing cycle on battery before summer so you know what the shutter does when mains goes.

Book a fire interface check or test

Send the controller and motor photos, the consultant's note and the name of your alarm contractor. Call +971 50 495 3512, send a photo, request a quote or book a site visit. Ask about a maintenance contract so the yearly test is booked. We cover Ajman, Sharjah and Muwaileh, and book Dubai and Abu Dhabi jobs by appointment.