FPS-1650, FPS-3250, and FPS-5000 Operation, Alarms, and Maintenance – South-Tek Systems

This article applies to South-Tek Systems N2-BLAST FPS-1650, FPS-3250, and FPS-5000 fire protection nitrogen generators.

Use this article for normal operating behavior, controller functions, alarm conditions, leak detection guidance, and routine maintenance for the FPS-1650, FPS-3250, and FPS-5000.

Normal operation

These systems automatically cycle between running and standby based on nitrogen storage tank pressure.

In Running mode, the system is producing nitrogen and supplying it to the storage tank.
When the tank reaches the cut-out pressure, the system enters Standby.
When pressure drops back to the cut-in point, the system automatically resumes nitrogen generation.

This automatic cycling is part of normal operation.

Touchscreen and controller functions

The FPS-1650, FPS-3250, and FPS-5000 use a PLC with touchscreen interface to monitor and manage system operation.

Home screen: Provides access to the dashboard, graphs, alarms, product information, settings, and maintenance functions.
Dashboard: Displays key system status information including pressure, purity, and run status.
Graphs and logs: These models support SMART-Trak sensor graph logs, sensor data logs, system performance logs, equipment status logs, N2 leakage logs, and bypass logs.
System settings: Includes pressure settings, sensor calibration, bypass settings, and alarm settings.
Maintenance menu: Includes valve control, alarm contacts, and filter maintenance functions.

Alarm conditions

These models support several alarm and status conditions through the controller.

Bypass alarm

The system can indicate when it is in bypass condition. Bypass settings and alarm behavior can be reviewed through the controller.

BlastOff alarm

If equipped, BlastOff helps identify possible leak or overdemand conditions. Repeated BlastOff events should be investigated rather than repeatedly reset.

Compressor issue alarm

The system can indicate compressor-related issues where applicable, including on models using integrated or associated compressor equipment.

Dryer issue alarm

The system can indicate dryer-related issues when that equipment is part of the installation.

Filter issue alarm

The controller supports filter alarm functions and filter maintenance reminders.

Leak checking

Leak checks are an important part of both commissioning and ongoing system support. Leaks can cause excessive run time, nuisance alarms, and unnecessary wear on the system.

Check external piping and fittings for leaks.
If tank pressure drops unexpectedly while the system is in standby, isolate sections of the system to narrow down the leak location.
If a leak is found, shut down the affected section, relieve pressure safely, and correct the issue before restarting.
If an internal leak is suspected, inspect the cabinet and tubing carefully and use only approved replacement parts.

Routine maintenance

Routine maintenance is important for reliable operation and long-term system performance.

Inspect the system regularly for abnormal alarms, leaks, and excessive cycling.
Replace filter elements as required by the maintenance schedule and operating conditions.
Use the touchscreen filter maintenance and alarm functions to track service intervals where applicable.
Replace valves on a 5-year schedule.

Filter maintenance

These models include filter maintenance functions in the controller and require periodic filter replacement. Follow the correct replacement procedure for all applicable filters and verify the system is depressurized before opening any filter housing.

Always shut down the system before servicing filters.
Confirm the filters are depressurized before disassembly.
Inspect bowls, seals, and housings during filter service.
Reset the filter maintenance indication after completing service, if applicable.

Valve replacement schedule

Valves should be replaced every 5 years as part of the major preventive maintenance interval.

When to get support

Contact support if the system does not enter standby as expected, repeatedly returns to run mode without demand, experiences recurring BlastOff or equipment alarms, or shows signs of internal leakage or recurring performance issues.

Manual download

FPS-1650, FPS-3250, and FPS-5000 O&M Manual

Need additional support?

Phone: (910) 415-1880
Email: support@southteksystems911.zendesk.com