Honeywell FC-PSU-UNI2450U Safety Management System Power Supplies

Alarms for power supply systems

SMS power supplies include diagnostics and alarms that should confirm that they are working correctly, are being monitored and acted upon.

These are indicators that the power supply needs to be aware of before a fault occurs.

LEDs for.

- Internal air temperature too high > 90 degrees Celsius

- Fan speed too slow

- The output voltage is out of the following ranges:

If the output voltage is consistently out of range, contact Honeywell for further information on recalibrating the power supply unit (PSU).

Cables

Cables must be properly secured so that they do not block the interior of the cabinet or get caught between moving parts such as doors or hinged panels.

Cables must also not be pulled too tightly to avoid mechanical stress on the connectors. Inspect the cables to ensure that there is no visible damage or cracks and that the terminals are making good contact.

Environmental factors

The overall life of any electronic device will vary depending on the environmental conditions in which it is installed.

The following factors are critical to the life cycle of the PSU and the continued health of the system.

Humidity

Humidity levels should be maintained between 40% and 60%, with a variation of less than 6% per hour.

If humidity levels are high, it may be necessary to condition the air inside the cabinet and monitor humidity.

During maintenance, look for signs of condensation inside the cabinet, which is a sign that the climate control is beginning to fail.

Corrosion

Look for visible signs of corrosion on paint and bare metal surfaces inside the cabinet.

Keep cabinet doors closed to prevent corrosive salts and chemicals from entering the cabinet. Watch for metal fragments, such as zinc in the air.

Watch for metal debris such as airborne zinc from the underside of raised floor tiles commonly used in computer rooms or from any nearby hardware assembly or construction activities.

If deterioration occurs that you can see, then even further damage can occur in components you can't see, so steps should be taken to further minimise contaminants.

Dust

Check the surface of the PSU and the bottom of the cabinet for dust, if you find a high concentration of dust, remove the dust using a soft anti-static brush and vacuum inside the cabinet.

Replace the cabinet fan dust filter periodically. The specific filter varies depending on the cabinet installed.

Cabinet Fans and Seals

Ensure that the cabinet fans are working properly, filters are clean and free of obstructions, protective plates and covers are secure, and all cabinet penetrations are sealed.

This is critical to avoid premature PSU failure.

New fan assemblies can be ordered with Honeywell part number FC-FANWR-24R.

Honeywell recommends replacing the fan every 8 years of operation.

Replace Power Supplies Before Failure

Improve System Reliability

Even with proper maintenance and environment, power supplies should be replaced before they fail.

For redundant systems, a phased approach may be helpful, where one power supply in each pair is replaced early and then the other is replaced at the next maintenance cycle.

Reliability can vary greatly depending on the load and temperature of the power supply.

Normal temperatures are kept at 35 degrees Celsius and a fully loaded PSU may have a shorter life depending on the temperature, reflecting the importance of keeping the fans running.

Many security systems use redundant power supplies so that each unit can carry 50% of the load during normal operation.

It is also common to specify spare capacity for PSU loads.

For example, with at least 25% spare capacity, each PSU can only carry 40% of the load in a worst-case scenario.

In this configuration, temperature and load do not limit PSU reliability.

Other factors, such as dust and humidity, are limiting, although these environmental conditions vary widely, making the exact life expectancy unknown.

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