HPCF-SFI — Alarms & Troubleshooting – South-Tek Systems

Applies to: HPCF-SFI — catalog numbers HPCF-SFI-0004, HPCF-SFI-0110, and HPCF-SFI-0130

Does NOT apply to: HPCF Series — see HPCF Series Alarms & Troubleshooting

This article covers the PLC alarm status indicators, active alarm conditions, and step-by-step troubleshooting for the most common HPCF-SFI fault conditions. When multiple causes are listed for a symptom, investigate the simpler solutions first. If a fault persists after following these steps, contact South-Tek Systems.

🛑 Safety First: Before performing any inspection or maintenance related to a fault condition, stop the system and isolate it from all electrical and pneumatic supplies. Fully depressurize the system — confirm all gauges read 0 PSIG — before opening any component or connection. Wear appropriate PPE throughout.

Alarm Status Indicators

When an alarm condition is active, the PLC displays a visual indicator and sounds the audible buzzer (if enabled). Press the Alarms button on the Home Screen to open the Alarm Status menu, which shows the current state of each monitored condition:

Alarm Status Item	Indicates
Nitrogen Generator Purity Status	Current O2 purity level relative to alarm setpoint — Normal or Alarm
Nitrogen Tank Pressure Status	Storage tank pressure relative to low-pressure alarm setpoint — Normal or Alarm
System Maintenance Kit Status	Status of 1K, 2K, and 5K hour maintenance kits — Good or Due
Booster Cooldown Required	The motor-driven booster has reached a thermal limit and has paused automatically to cool down — see Booster Cooldown troubleshooting below
Pressure Dew Point	Dew point alarm status (if dew point sensor is installed)
Nitrogen Blastoff Status	Leak detection alarm status (if Blastoff option is installed)

ℹ Info at Time of Alarm: When an alarm is active, navigate to Alarms → Info at Time of Alarm to view a snapshot of system conditions at the moment the alarm triggered — including date, time, nitrogen purity, tank pressure, cylinder pressure, run hours, and air tank pressure (if sensor included). This is useful for diagnosing intermittent faults.

System Does Not Start

Probable Cause	Corrective Action
System On/Off button is in Off position (red)	Press and hold the Start/Stop button on the Home Screen until it turns green
Emergency stop engaged	Confirm E-stop button is not depressed; twist to release if engaged
Over-current protection tripped in electrical control panel	Confirm the over-current protection inside the electrical control panel is in the On position; cycle the main circuit breaker if already on. Investigate root cause if it trips repeatedly.
Power cable disconnected or loose	Ensure all electrical connections — including the CS6365 power cable — are fully secured
Low voltage or incorrect supply	Verify supply voltage is 220 VAC / 60 Hz / 1 Phase and matches the unit nameplate

Compressor Does Not Start (After 2-Minute Delay)

The integrated compressor has a built-in 2-minute startup delay. If the compressor fails to start after this delay has elapsed:

Probable Cause	Corrective Action
Residual pressure above 1 PSIG inside the compressor	Carefully pull the safety relief valve on the compressor to relieve residual pressure, then allow the 2-minute delay to restart. If this occurs frequently, the compressor check valves may need replacement — contact South-Tek Systems.
Over-current protection tripped	Check that the over-current protection in the control panel is in the On position

System Powers On But Booster Does Not Start

Probable Cause	Corrective Action
Booster not started from PLC	Press the Start button in the Booster Controls box on the Home Screen
Booster switched off at the unit	Confirm the booster is switched on; confirm the outlet bleed valve (left side) is turned fully clockwise and the outlet shutoff valve (right side) is fully counterclockwise
Over-current protection on booster has tripped	Push the over-current protection button on the front of the booster back into place. If the booster continuously trips the over-current protection, there may be a fault with the circuit breaker or the booster motor — contact South-Tek Systems.
N2 tank pressure too low to reach booster cut-in	Allow the nitrogen generator to run and build storage tank pressure to the booster cut-in value before expecting the booster to start
Booster Cooldown active	See Booster Cooldown section below

Booster Cooldown

The HPCF-SFI motor-driven booster has a built-in thermal protection feature. If the booster runs for an extended period and reaches its thermal limit, the PLC will automatically pause the booster and display a Booster Cooldown Required status on the Home Screen and in the Alarm Status menu.

Allow the booster to cool down with the system running but the booster paused. Do not force-restart the booster during cooldown.
Once the booster has cooled sufficiently, the Cooldown status will clear automatically and the booster will resume normal operation.
If Booster Cooldown occurs frequently, it may indicate that the duty cycle is too high for the ambient conditions, the booster needs service, or there is a fault in the thermal protection circuit. Contact South-Tek Systems if this condition repeats.

ℹ Target Duty Cycle: The HPCF-SFI is designed for a 70% maximum duty cycle. Sustained operation above this level increases the likelihood of booster cooldown events and accelerates wear. If fill demand consistently exceeds the system's design capacity, contact South-Tek Systems to discuss options.

System Not Reaching Desired Cylinder Pressure

Probable Cause	Corrective Action
F5 outlet purification filter missing or incorrectly installed	Check that the F5 filter cartridge is correctly installed in the high-pressure outlet filter housing; a missing or improperly seated cartridge can prevent pressure from building
Cut-off pressure setting incorrect	Press the Info button on the Home Screen to confirm the outlet pressure setting matches the specification for your unit; contact South-Tek Systems if adjustment is needed
High-pressure system leak	Check all high-pressure connections, hoses, and fittings with leak detection solution; repair any leaks found

Low Nitrogen Generator Purity

Probable Cause	Corrective Action
System needs purge after startup or prolonged shutdown	Allow the system to run and purge fully before connecting cylinders for filling; monitor purity on the Home Screen and do not begin filling until design purity is confirmed
Product flow rate too high	Reduce downstream nitrogen demand; allow the system to catch up and restabilize purity
O2 sample port valved off	Confirm the O2 gas sample valve from the nitrogen storage tank is fully open
O2 analyzer malfunction or out of calibration	Validate sensor accuracy using a known test gas connected to the generator sample line. Contact South-Tek Systems before recalibrating.
PSA exhaust port blocked	Inspect the exhaust vent path for blockages or excessive backpressure; clear as needed
Faulty process valves or seals	Test each process valve individually using the PLC Maintenance Menu; replace any valve not operating correctly
Contaminated or depleted CMS in PSA beds	Inspect molecular sieve condition; contact South-Tek Systems for guidance on topping off or replacement

⚠ Do Not Fill Cylinders During a Purity Alarm: If a purity alarm is active, do not connect or fill cylinders until purity has been confirmed at or above the design specification. Off-spec nitrogen in cylinders may render them unsafe for use.

Low Nitrogen Storage Tank Pressure

Probable Cause	Corrective Action
Dirty or clogged air compressor inlet filter (F0)	Inspect and replace the F0 filter element; see the Filter & Preventive Maintenance article
Low air tank pressure from compressor	Check compressor output; verify the air inlet regulator on the nitrogen generator is set to the design specification
Worn compressor valves	Schedule compressor valve service; contact South-Tek Systems for the correct 2K or 5K hour maintenance kit
System leak (nitrogen side)	Inspect all fittings, valves, and connections with leak detection solution; confirm the N2 tank drain valve is fully closed
Faulty process valve or disconnected pneumatic line	Test each process valve via the PLC Maintenance Menu; inspect all pneumatic lines and reconnect any that are loose or damaged

Excessive Noise

Probable Cause	Corrective Action
System leak	Check all connections with leak detection solution; hissing or high-pitched noise often indicates a pressurized leak
Worn compressor or booster components	Schedule a service visit; worn compressor or booster valve components produce increased mechanical noise and should be addressed promptly — contact South-Tek Systems

Maintenance Kit Due Alert

The PLC tracks system run hours and automatically alerts when a maintenance kit interval is reached. When the System Maintenance Kit Status shows Due in the Alarm Status screen:

Navigate to Menu → Alarms / Filter Parameters → FRP Frequency to identify which kit (1K, 2K, or 5K hour) is due.
Order the appropriate FRP kit for your catalog number — refer to the Overview & Specifications article for kit part numbers.
Complete the service per the Filter & Preventive Maintenance article.
Press Reset next to the kit that was serviced to restart the run-hour counter and clear the alert.

When to Contact South-Tek Systems

Persistent low purity or low flow after completing all troubleshooting steps above
Booster Cooldown that occurs frequently or does not clear
Compressor that fails to start or repeatedly trips the over-current protection
Unidentified alarm conditions not covered in this article
Any mechanical or electrical fault requiring advanced diagnostics or component replacement
Any condition requiring access to internal PSA bed components

Contact South-Tek Systems

Phone: (910) 415-1880

Email / Ticket: support@southteksystems911.zendesk.com