- Solar and energy
- UPS (uninterruptible power supply)
bOPN
Salicru UPS bOPN: battery pack open or disconnected
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Alarm code bOPN on the LCD panel of a Salicru SLC TWIN PRO2 UPS means Battery open because the battery pack is not connected properly or the battery breaker is turned off.
Safety first
Stop and check this first
- Batteries carry hazardous voltages and the battery circuit is not isolated from the AC input: hazardous voltages exist between battery and earth terminals even with the input breaker off, so battery maintenance must only be done by qualified personnel.
Safe checks you can perform
- Confirm the bOPN alarm code on the cyclical LCD status screen
- Visually inspect external battery connection and breaker on B1 models
- Gather the diagnostic details required by Salicru Technical Service and Support
Leave these tasks to a qualified professional
- Do not attempt this professional task: Execution of the UPS battery test (TEST) to confirm bOPN clearance
- Do not attempt this professional task: Qualified inspection of the battery bank connection, breaker, and internal fuses
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Execution of the UPS battery test (TEST) to confirm bOPN clearance
What they doAfter verifying that the battery bank is connected to the UPS and the battery breaker is turned on, the technician runs the battery test (operating code TEST) to confirm that bOPN clears.
They must show youthe LCD panel completing the TEST operating mode and returning to LINE mode with bOPN cleared.
In writingbattery test outcome, battery voltage and capacity readings on the LCD, and confirmation that bOPN is inactive.
Qualified inspection of the battery bank connection, breaker, and internal fuses
What they doQualified personnel familiar with battery safety verify that no hazardous voltage is present between battery terminals and earth, inspect the battery bank cabling, breaker, and internal battery fuses, and restore the connection using original parts.
They must show youthe secured battery bank connection and closed battery breaker after the circuit is restored.
In writingcause of the open battery indication (connector, breaker, or fuse) and measured battery bank voltage.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Confirm the bOPN alarm code on the cyclical LCD status screen
- Who:
- you, reading the front control panel of the Salicru SLC TWIN PRO2 UPS.
- How:
- watch the LCD screen and note whether bOPN appears alone or cycles with other alarm codes such as bLOW or CHGF.
- Result that matters:
- confirm that bOPN (Battery open) is the active alarm and record any accompanying codes before taking action.
- If bOPN is the only active code:
- proceed with an external visual check if your unit uses an external B1 battery module.
- If bOPN cycles alongside CHGF (Charger is faulty) or dCHF (Extra-charger is faulty):
- record all codes and contact Salicru Technical Service and Support (T.S.S.).
- Evidence to keep:
- photo or note of all codes cycling on the LCD panel and the audible alarm state.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Visually inspect external battery connection and breaker on B1 models
- Who:
- you, checking only the exterior without opening the UPS chassis or touching battery terminals.
- How:
- without removing any covers or touching uninsulated conductors, check externally whether an external battery bank is plugged into the UPS and whether the external battery breaker is turned on.
- Result that matters:
- identify an unplugged external battery cable or a switched-off external battery breaker.
- If an external battery breaker was off and turning it on followed by a battery test clears bOPN:
- keep a record of the successful test.
- If your UPS is a standard internal-battery model (B0) or bOPN remains active:
- do not open the enclosure and request qualified personnel or Salicru T.S.S.
- Evidence to keep:
- whether the unit is a B0 or B1 version and the observed position of the external battery breaker.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Gather the diagnostic details required by Salicru Technical Service and Support
- Who:
- you, compiling the checklist listed in Section 8.2 of the Salicru user manual.
- How:
- write down the UPS model and serial number, the date bOPN appeared, the complete LCD panel description and alarm status, input power and load level, ambient temperature and cooling conditions, and battery information (capacity, quantity, and B0 or B1 configuration).
- Result that matters:
- provide Salicru T.S.S. with complete information so qualified personnel can inspect the battery circuit safely.
- If T.S.S. schedules service:
- protect critical loads by another means until bOPN is resolved, as an open battery circuit provides no backup autonomy during a blackout.
- If your product is not yet registered:
- you can register it on Salicru's website to include it in the T.S.S. warranty database.
- Evidence to keep:
- recorded model, serial number, B0/B1 battery details, and operating environment notes.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Salicru
- Product type
- UPS (uninterruptible power supply)
Known code variants
- Alarm code bOPN
- Batería abierta
- Battery open
- Battery pack is not connected correctly
- bOPN
- Código de alarma bOPN
- El módulo de baterías no está conectado correctamente
What it means
On Salicru SLC TWIN PRO2 (0.7 to 3 kVA) uninterruptible power supplies, the front LCD panel displays alarm code bOPN (Battery open) when the unit detects that the battery module is not properly connected. When one or more alarms are active on this series, the LCD cycles through the triggered alarm codes instead of showing the normal operating mode code. Salicru's troubleshooting table attributes bOPN to an unconnected battery bank or an open battery breaker and instructs running a battery test to confirm resolution. This code by itself never proves that the battery cells or internal charger have failed.
Warnings and stop conditions
- Highsource verified
Batteries carry hazardous voltages and the battery circuit is not isolated from the AC input: hazardous voltages exist between battery and earth terminals even with the input breaker off, so battery maintenance must only be done by qualified personnel.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Symptoms and causes
Probable causes · in order
- Battery pack or external battery bank not connected properlyCommon
Salicru's troubleshooting guide states for bOPN that the battery pack is not connected correctly to the UPS.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
- Battery circuit breaker is turned off (open)Common
On installations equipped with a battery bank breaker, bOPN triggers when the battery breaker is in the open position instead of turned on.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
- Internal battery fuses or interlink connections left openLess common
If internal battery fuses or interlink connections between the batteries and the UPS were opened during maintenance and not restored, the UPS reports an open battery circuit.
Evidence: Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA) · User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Virtual technician
Does bOPN still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Manual de usuario SAI SLC TWIN PRO2 (0.7.. 3 kVA)
Salicru · 2024 · official_doc
- 2
User Manual UPS SLC TWIN PRO2 (0.7.. 3 kVA)
Salicru · 2024 · official_doc
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