Riello UPS Sentinel Tower STW 5000

Questions and Answers

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steven76Sep 23, 2025
What does it mean if my Riello UPS Power distribution unit display and fans are off but the load is powered?
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  Tracy DouglasSep 23, 2025
  If the display is off, the fans are off, but the load is powered on your Riello UPS Power distribution unit, it indicates a fault in the auxiliary power supplies, with the UPS in bypass supported by the redundant power supply. Activate the maintenance bypass (SWMB) if present. Switch off the UPS, wait for a minute, and turn the UPS back on. If the display does not turn on or if the sequence fails, contact the nearest service centre, leaving the UPS in manual bypass mode.
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Robert KingSep 13, 2025
What does it mean if my Riello UPS Sentinel Tower STW 5000 displays codes F11, F14, F17, L06, L07, L08, L09, L14, L17, or L20?
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  Brandon WashingtonSep 13, 2025
  If the Riello UPS Power distribution unit display shows one or more of the following codes: F11, F14, F17, L06, L07, L08, L09, L14, L17, L20, this could be due to anomalous loads applied or a fault in the input or output stage of the UPS. Remove the load. Insert the maintenance bypass (SWMB) if present, turn the UPS off and back on again, and exclude the maintenance bypass. If the problem persists, contact the nearest service centre.
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Sean CummingsSep 10, 2025
What does it mean if my Riello UPS Sentinel Tower STW 5000 displays A30 or A32 and won't start?
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  Erin GouldSep 10, 2025
  If the Riello UPS Power distribution unit display shows one or more of the following codes: A30, A32 and the UPS does not start up, it may be because the ambient temperature is below 0°C or there is a fault in heat sink temperature probe. Heat the environment and wait for the heat sink temperature to rise above 0°C before starting the UPS. Alternatively, activate the maintenance bypass (SWMB) if present, turn the UPS off and back on again and exclude the maintenance bypass. If the problem persists, contact the nearest service centre.
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Frank GonzalezAug 27, 2025
What to do if my Riello UPS Power distribution unit display shows code A26?
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  Tyler BrockAug 27, 2025
  If the Riello UPS Power distribution unit display shows the code A26, it indicates that the battery fuses are blown or the fuse holder isolators are open. Replace the fuses or close the battery fuse holder isolator (SWBATT). If necessary, replace the fuses with others of the same type.
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James DuncanAug 30, 2025
What to do if my Riello UPS Power distribution unit has no power to the load?
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  Kimberly MaciasAug 30, 2025
  If no power reaches the load from your Riello UPS Power distribution unit, it might be due to a few reasons: * A missing connection to the output terminal: Connect the load to the terminals. * The UPS is in standby mode: Run the start-up sequence. * The STAND-BY OFF mode is selected: Change the operating mode, as this mode only powers the loads during a blackout. * A malfunction of the UPS with the automatic bypass out of use: Insert the maintenance bypass (SWMB) and contact the nearest service centre.
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Taylor BurtonAug 31, 2025
What does it mean when my Riello UPS Power distribution unit displays codes A22, F23, or L23?
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  Joshua SanchezSep 1, 2025
  If the Riello UPS Power distribution unit display shows one or more of the following codes: A22, F23, L23, it means that the load applied to the UPS is too high. Reduce the load to below the 100% threshold (or user threshold for the code A22).
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Kristy DaltonSep 2, 2025
What to do if my Riello UPS Sentinel Tower STW 5000 Power distribution unit display shows code L26?
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  Sherri LunaSep 2, 2025
  If the Riello UPS Power distribution unit display shows the code L26, it indicates a short circuit at the output. To resolve this, switch off the UPS, disconnect all the devices, turn the UPS back on, and then reconnect the devices one by one until the fault is identified.
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Jessica WestNov 28, 2025
Why won't my Riello UPS Sentinel Tower STW 5000 Power distribution unit switch to standby mode?
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  Jacob GentryNov 28, 2025
  If your Riello UPS Power distribution unit is connected to the mains but doesn't switch to standby mode (the display doesn't light up), several issues could be the cause: * A missing connection to the input terminal: Connect the mains to the terminals following the instructions in the “POWER CONNECTION” section. * A missing neutral connection: The UPS requires a neutral connection to function. Connect the mains to the terminals as explained in the “POWER CONNECTION” section. Note: the absence of this connection can damage the UPS and/or the load. * The isolator (SWIN) is open: Close the isolator. * Mains power is missing (blackout): Ensure the mains power is present. If necessary, perform a battery start-up to power the load. * The upstream protection device has been triggered: ...
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Kristina HendersonNov 22, 2025
What to do if my Riello UPS Sentinel Tower STW 5000 Power distribution unit display shows F34 or L34?
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  Eddie MurphyNov 22, 2025
  If your Riello UPS Power distribution unit display shows one or more of the following codes: F34, L34, it may be due to several reasons: * The ambient temperature is higher than 40°C. * Heat sources are too close to the UPS. * Ventilation slits are obstructed or too close to the walls. To resolve this, activate the maintenance bypass (SWMB) if present, without switching off the UPS. This will allow the fans to cool the heat sink more rapidly. Eliminate the cause of the overtemperature and wait for the heat sink temperature to drop before excluding the maintenance bypass. Another cause may be a fault in the temperature probe or UPS cooling system. In this case, insert the maintenance bypass (SWMB) if present, without switching off the UPS, so that the fans cool the heat sink more ra...
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Tiffany BrownSep 12, 2025
What does it mean if my Riello UPS Power distribution unit display shows F09 or F10?
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  lijasonSep 12, 2025
  If the Riello UPS Power distribution unit display shows one or more of the following codes: F09, F10, it may be because the voltage value of phase 1 is not sufficient to pre-load the UPS or there is a fault in the UPS input stage. Wait for the input network voltage values to stabilise within the ranges accepted by the UPS. If the problem persists, activate the maintenance bypass (SWMB) if present, turn the UPS off then back on again, and exclude the maintenance bypass. If the problem continues, contact the nearest service centre.

Summary

Introduction

Environmental Protection

Company's commitment to environmental aspects, material analysis, and recyclable packaging.

Product Disposal Guidelines

Instructions for the safe and environmentally responsible disposal of the UPS and battery box.

Presentation

UPS Views and Components

Visual identification of key UPS components on front, rear, and display panels.

Battery Box and Charger Options

Details on optional battery boxes and additional internal battery chargers for extended runtime.

Installation

Initial Content Check

Procedure for verifying all components are present after unpacking the UPS or battery box.

UPS Pallet Removal

Step-by-step instructions for safely removing the UPS or battery box from its shipping pallet.

Installation Environment Requirements

Recommended conditions for UPS installation, including temperature, humidity, and ventilation.

UPS Placement Guidelines

Guidelines for positioning the UPS for optimal operation and maintenance access.

Power Connection for 5-6 kVA Models

Instructions for connecting the 5-6 kVA UPS models to the power supply and load.

Power Connection for 8-10 kVA Models

Instructions for connecting the 8-10 kVA UPS models to the power supply and load.

Internal Protective Devices

Information on internal fuses protecting the rectifier, inverter, and battery stages.

External Protective Devices

Guidelines for selecting external protection devices like fuses and magnetothermal switches.

Cable Connection Details

Specifications for cable cross-sections and stripping lengths for input and output connections.

Electrical Connections

Terminal board diagrams for connecting input and output cables for different UPS models.

Wiring Diagrams

Schematic diagrams illustrating different electrical system connection configurations for the UPS.

Battery Box Installation and Configuration

Procedures for installing battery boxes and configuring rated battery capacity via software.

Use

Initial Startup Procedure

Step-by-step guide for powering on the UPS for the first time.

Powering On;Off Operations

Procedures for switching the UPS on from mains or battery, and switching it off.

Internal Clock Setting

Instructions for setting the UPS internal clock via configuration software.

Display Panel Messages and Status

Explanation of icons, status, and messages shown on the UPS LCD display.

Measurement Display Area

How to display UPS operating information like voltage, frequency, load, and battery status.

Operating Mode Configuration

How to access and change the UPS operating mode directly from the display panel.

Additional UPS Functions

Details on Manual Bypass, Programmable Auxiliary Sockets, and External Temperature Probe.

Software Integration and Configuration

Instructions for installing and using monitoring, control, and configuration software for the UPS.

UPS Configuration Parameters

Overview of configurable parameters for adapting the UPS to specific requirements.

Communication Ports and Connectivity

Description of RS232, USB ports, and expansion slots for UPS communication.

Troubleshooting

Common Troubleshooting Issues

Table of common problems, their possible causes, and solutions for UPS operation.

Status and Alarm Codes

Detailed explanation of UPS status, user messages, anomalies, faults, and lock codes.

Technical Data

UPS Model Specifications

Detailed technical specifications for different UPS models, including input, battery, and output data.

Additional Technical Data

Other data like environmental limits, dimensions, weights, and battery box specifications.