Fujitsu F53 Bill Dispenser: Intermittent Dispensing &... | terminalfaults.org

Technical Background:

The F53 operates on 24V DC. A voltage drop indicates insufficient power delivery to the unit, affecting the solenoids responsible for bill release and transport. This can be caused by PSU degradation, wiring issues, or excessive load. The bill validation process relies on optical sensors and magnetic heads, which are voltage-sensitive. Low voltage can cause misreads or failures in this process. Cold temperatures increase conductor resistance, exacerbating voltage drop.

Symptoms:

The Fujitsu F53 bill dispenser exhibits intermittent dispensing failures. A voltage drop is observed on the power line supplying the unit during operation.

Possible Causes:

Degraded 24V DC power supply unit (PSU) providing insufficient current.
Loose or corroded power connectors, increasing resistance and causing voltage drop.
Damaged or degraded power cabling with increased resistance.
High ambient temperature increasing resistance in power components.
Excessive load on the 24V DC power supply exceeding its rated capacity.
Accumulation of dust or debris on internal components causing short circuits or increased resistance.

Solution:

1

Measure the 24V DC voltage at the F53 input terminals during bill dispensing. Use a calibrated multimeter.
2

If the voltage drops below 23V DC during operation, inspect the 24V DC power supply unit. Check its output voltage under load.
3

Verify the power cable connections at both the power supply unit and the F53 unit. Tighten any loose connections.
4

Inspect the power cable for any signs of damage, such as cuts, abrasions, or corrosion. Replace the cable if necessary.
5

Measure the resistance of the power cable to ensure it is within acceptable limits. Excessive resistance indicates a problem with the cable.
6

If the power supply voltage is stable and the cable is good, disconnect any unnecessary peripherals from the 24V DC power supply to reduce the load.
7

Ensure the power supply unit has adequate ventilation to prevent overheating. Clean any dust or debris from the power supply fan and vents. Consider replacing the PSU.

Safety Warning:

High voltage is present in the power supply unit. Ensure the power is disconnected via Lockout/Tagout (LOTO) procedures before performing any maintenance or repairs. Wear appropriate personal protective equipment (PPE), including insulated gloves and eye protection. Ensure adequate ventilation when working with electronic components.

Prevention:

Regularly inspect and clean the F53 unit and its power connections. Use cable ties to provide strain relief on the power cable. Ensure the 24V DC power supply unit is adequately sized for the load and is operating within its specified temperature range. Replace the PSU every 3-5 years.

Expert Tip:

A common cause of voltage drop is corrosion on the power connectors. Apply a small amount of electrical contact cleaner to the connectors to improve conductivity. Consider using a DC-DC converter with a wider input voltage range to compensate for voltage fluctuations.

Frequently Asked Questions

•What is the rated current draw of the Fujitsu F53?

The rated current draw of the Fujitsu F53 should be specified on the unit's label. Consult the device documentation.

•What is the recommended wire gauge for the 24V DC power cable?

The recommended wire gauge depends on the length of the cable and the current draw. Consult the device documentation and applicable electrical codes.

•Where is the 24V DC power supply unit located?

The location of the 24V DC power supply depends on the kiosk design. Trace the power cable from the F53 to locate it. Often located in base of the kiosk.

Fujitsu F53 Bill Dispenser: Intermittent Dispensing & Voltage Drop Diagnosis

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the rated current draw of the Fujitsu F53?

•What is the recommended wire gauge for the 24V DC power cable?

•Where is the 24V DC power supply unit located?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: