Hantle 1700W Power Supply Cycling Diagnostic Report -... | terminalfaults.org

Technical Background:

Power supplies in unattended kiosks are subjected to wide temperature fluctuations and potential voltage spikes from the grid. The Hantle 1700W employs a switching regulator to maintain a stable 24V DC output for bill validators and solenoids. Cycling behaviour suggests issues in the feedback loop of this regulator, or potentially with the over-voltage/under-voltage protection circuits. Capacitors degrade at -40C. Bill validators introduce inductive loads that cause voltage spikes.

Symptoms:

The Hantle 1700W power supply exhibits a cyclical pattern of powering on and off. Voltage fluctuation is suspected based on initial observation.

Possible Causes:

Degraded electrolytic capacitors within the power supply affecting voltage regulation.
Over-Voltage Protection (OVP) or Under-Voltage Protection (UVP) circuitry malfunction causing false triggering.
Loose or corroded DC power connectors leading to intermittent voltage drops.
Excessive load on the 24V DC rail exceeding the power supply's capacity (bill validator faults, solenoid activation issues).
Extreme temperature (-40C) operation causing component stress and altered performance.
Input voltage instability from the mains power supply.

Solution:

1

Inspect all external DC power connectors for corrosion or looseness. Reseat connectors to ensure proper contact.
2

Measure the input AC voltage to the Hantle 1700W power supply using a calibrated multimeter. Verify that it is within the specified operating range (e.g., 100-240V AC).
3

Disconnect the bill validator and solenoids from the 24V DC power rail. If the power cycling stops, the fault lies with one of those components. Reconnect devices one-by-one to isolate which is causing the excessive load.
4

Using a multimeter, monitor the 24V DC output voltage of the power supply with the loads disconnected. Observe if voltage fluctuations still occur.
5

If voltage fluctuations are still observed with no load, consider replacing the Hantle 1700W power supply with a new unit. Ensure the replacement is rated for the same voltage and current output.
6

Log the input voltage for a 24-hour period using a data logger to check for erratic or intermittent voltage variations.
7

Inspect the kiosk's grounding system for proper connections to prevent electrical noise. Use a ground impedance tester.

Safety Warning:

High Voltage Present: The Hantle 1700W power supply operates with potentially lethal voltages. Ensure the kiosk is disconnected from the mains power supply before performing any inspections or maintenance. Verify that all capacitors are fully discharged before touching any internal components. If the situation requires working on energized components, use proper PPE (Personal Protective Equipment) rated for the voltage involved. Avoid working alone.

Prevention:

Regularly inspect and clean all power connectors to prevent corrosion.,Monitor the kiosk's internal temperature and humidity levels. Consider adding a small heater if the ambient temperature frequently drops below -20C.,Ensure proper ventilation around the power supply to prevent overheating.,Implement surge protection on the incoming AC power line.,Schedule preventative maintenance to inspect and replace components like electrolytic capacitors every 3-5 years, especially in extreme environments.,Apply dielectric grease to connectors.

Expert Tip:

Many power supply cycling issues are caused by inrush current limiting components degrading over time. Before replacing the entire unit, check the condition of the NTC thermistor on the AC input side. A failing NTC can cause the power supply to cycle due to overcurrent protection.

Frequently Asked Questions

•What is the exact voltage range the Hantle 1700W should be operating within?

Consult the manufacturer's specifications, but typically it should be between 23V DC and 25V DC when loaded.

•What type of surge protection is recommended for the incoming AC power?

A surge protection device (SPD) rated for the appropriate voltage and current, conforming to local electrical codes (e.g., CSA standards in Canada) is required.

•Where can I find a suitable replacement power supply?

Contact Hantle directly or search for compatible power supplies from reputable industrial component distributors. Ensure the voltage, wattage, and connector types match.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the exact voltage range the Hantle 1700W should be operating within?

•What type of surge protection is recommended for the incoming AC power?

•Where can I find a suitable replacement power supply?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: