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What This Guide Helps With
Backup power is unavailable or short-lived because of AC supply, UPS connection, battery condition, charging, external damage, or service-level power problems.
Step-by-Step Troubleshooting
1. Protect Medication Access
Do not intentionally remove AC power from an in-service medication cabinet solely to test backup runtime unless the cabinet has been removed from clinical dependency and the test is authorized.
If the cabinet cannot remain powered reliably, arrange alternate medication access.
Expected outcome: Medication availability is maintained while power backup is evaluated safely.
2. Confirm the Exact Backup-Power Complaint
Determine whether:
- The UPS shows a fault.
- The cabinet shuts down immediately when AC is lost.
- Backup runtime is unusually short.
- The battery does not appear to charge.
- The UPS alarms continuously.
- The cabinet experienced an unexpected shutdown during an outage.
Record visible indicators or messages.
Expected outcome: The issue is classified as charging, runtime, UPS power, alarm, or transfer failure.
3. Verify Facility AC Power
Confirm the cabinet and UPS are connected to an energized approved receptacle.
Test the outlet using approved equipment or facility procedure.
Check for a loose plug or accidental disconnection.
Expected outcome: Stable AC input is present.
If restoring facility power resolves the complaint and the UPS returns to normal indication, continue with verification and stop troubleshooting when stable.
4. Inspect the UPS and Power Connections
Inspect accessible:
- UPS power cord.
- Cabinet-to-UPS connection.
- External battery connection if user-accessible and designed for inspection.
- Power switch.
- Indicators.
- Housing.
Look for damage, overheating, swelling, odor, leakage, or fluid intrusion.
If battery swelling, overheating, leakage, or burning odor is present, remove the equipment from service and follow facility battery-safety procedures.
Expected outcome: External power connections are secure and there are no hazardous battery conditions.
5. Confirm Normal Charging Conditions
With AC restored, observe whether the UPS or cabinet indicates normal charging or normal power state.
Do not assume a battery is defective immediately after an extended power outage without allowing the approved charging process to occur.
Do not invent or apply an unofficial charge time.
Expected outcome: The UPS recognizes AC input and shows a normal charging or ready condition.
6. Review Recent Power History
Determine whether the problem followed:
- Extended outage.
- Repeated short outages.
- Cabinet relocation.
- UPS disconnection.
- Long period out of service.
- Recent battery or UPS replacement.
Expected outcome: A plausible external reason for depleted backup power is identified or ruled out.
7. Test Backup Operation Only Under Controlled Conditions
If required by your facility and manufacturer-approved procedure, remove the cabinet from clinical dependency and perform the appropriate approved backup-power test.
Use specified test methods rather than estimating battery condition from a casual unplug test.
Expected outcome: The cabinet transfers to backup power and performs acceptably under the approved test, or the backup system fails objectively.
If the approved test passes and the cabinet remains stable, troubleshooting can stop.
8. Verify Cabinet Startup After Power Events
Confirm the cabinet:
- Remains stable on AC.
- Does not unexpectedly restart.
- Recovers normally after an approved power-transfer test.
- Maintains expected secure functions.
Expected outcome: Power transitions do not produce abnormal shutdowns or application instability.
9. Determine Whether the Issue Is UPS- or Cabinet-Specific
If a separate approved UPS is used, evaluate whether the UPS itself is indicating the problem versus the cabinet reporting an internal battery or power issue.
Use known-good substitution only when specifically approved and electrically compatible.
Expected outcome: The fault is localized to the external UPS, battery subsystem, or cabinet.
10. Escalate a Failed Backup-Power System
If normal AC is present and the UPS or backup battery fails an approved test, will not charge, or shows unsafe physical condition, stop troubleshooting.
Expected outcome: Unreliable backup power is removed from clinical use and routed for qualified service or approved replacement.
If the Problem Persists
External AC supply, cords, UPS connections, charging condition, and approved operational checks have been completed.
Possible remaining categories include battery degradation, charger circuitry, UPS electronics, internal power distribution, or cabinet power-management problems.
The cabinet should be:
- Removed from service when reliable power cannot be assured.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using manufacturer documentation and approved test equipment.
- Repaired or configured only by qualified personnel.
Return to service only after AC operation, charging, backup transfer, required runtime testing, and stable cabinet operation meet the applicable approved requirements.
Knowing when to stop and replace or escalate a failed backup-power system is proper troubleshooting.
Clinical Use Tip
Do not discover a failed backup battery during an actual outage; verify backup-power performance through the facility's approved maintenance and test process.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Pharmacy reported the Pyxis MedStation ES shut down immediately during a brief loss of facility power."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering verified normal AC power but the associated UPS failed the approved backup-power test and showed no usable battery support."
Resolution
What action was taken.
Example:
"Removed the failed UPS from service, installed an approved replacement through the proper process, and verified normal AC operation, backup transfer, and stable cabinet function."
Helpful Details to Include (If Known)
- UPS or backup-battery indicators.
- AC receptacle test result.
- Recent outage history.
- Loose or damaged power connections.
- Battery swelling, heat, odor, or leakage.
- Charging indication.
- Approved backup test result.
- Cabinet behavior during power transfer.
- Replacement performed.
- Final power and cabinet status.
Final Thought
Verify facility power and external connections before assuming a battery failure, treat damaged batteries as a safety concern, use approved backup tests, and document reliable operation before returning the cabinet to service.
That is successful troubleshooting.