Riello MST 40 - User Manual

Questions and Answers

J
Julie PerezAug 20, 2025
What to do if my Riello UPS is connected to the mains but does not switch to standby mode?
- B
  Betty FloydAug 20, 2025
  If your Riello UPS, connected to the mains, does not switch to standby mode, consider the following potential causes and solutions: * **Missing Input Terminal Connection:** Ensure the mains are correctly connected to the terminals as indicated in the installation instructions. * **Missing Neutral Connection:** Verify the neutral connection to the terminals, following the installation guide. * **Open Isolator:** Check if the isolator behind the door (SWIN) is open and close it. * **Mains Power Outage:** Confirm that mains power is present. If there is a blackout, perform a battery start-up to power the load. * **Upstream Protection Device Intervention:** Restore the protection, but first, ensure there is no overload or short circuit on the UPS output.
B
Brian BradyAug 25, 2025
What should I do if my Riello MST 40 display shows F37, L37?
- A
  Allison BrooksAug 25, 2025
  If the Riello UPS display shows one or more of the following codes: F37, L37, it suggests an overtemperature condition or a fault in the battery charger cooling system. This could be due to high ambient temperature, heat sources near the UPS, obstructed ventilation, or a fault in the temperature probe. Eliminate the cause of the overtemperature. Open the battery fuse holder isolators (SWBATT) and wait for the temperature of the battery charger heat sink to drop. Close the battery fuse holders. Warning: never open the SWBATT fuse holders during battery operation.
D
David Smith Jr.Aug 26, 2025
What does it mean when my Riello MST 40 UPS display shows L26, L27, or L28?
- G
  garciamarkAug 26, 2025
  If the Riello UPS display shows one or more of the following codes: L26, L27, L28, it indicates a short circuit at the output. Switch off the UPS. Disconnect all the devices connected to the phase concerned by the short circuit. Turn the UPS back on. Reconnect the devices one by one until the fault is identified.
L
Linda OwensAug 27, 2025
What does it mean if my Riello UPS display shows A39, A40 and the red 'Replace Batteries' LED is on?
- K
  Karina ShafferAug 28, 2025
  If the Riello UPS display shows one or more of the following codes: A39, A40, and the red “Replace Batteries” LED is on, it means the batteries have failed the periodic efficiency test. It is recommended to replace the batteries of the UPS, since they are no longer able to maintain the charge for a sufficient autonomy. Warning: The replacement of the batteries must be carried out by qualified personnel.
M
Michelle DavisAug 29, 2025
How to resolve a no power issue to the load with my Riello UPS?
- K
  Kimberly JacksonAug 30, 2025
  If no power reaches the load connected to your Riello UPS, check the following: * **Output Terminal Connection:** Ensure the load is properly connected to the output terminals. * **Isolator Position:** Verify that the isolator behind the door (SWOUT) is closed. * **UPS Stand-By Mode:** If the UPS is in stand-by mode, run the start-up sequence. * **Stand-By Off Mode:** If the STAND-BY OFF mode has been selected, change the operating mode, as this mode only powers the loads during a blackout. * **UPS Malfunction:** If there is a UPS malfunction, insert the maintenance bypass (SWMB).
J
Jesse Foster PhDAug 31, 2025
What does code S06 mean on my Riello MST 40 display?
- J
  Jessica JonesAug 31, 2025
  If the Riello UPS display shows the code S06, it means the batteries are discharged and the UPS is waiting for the battery voltage to exceed the set threshold. Wait for the batteries to recharge or force startup from the “SYSTEM ON” menu.
K
kingtravisSep 2, 2025
Why does my Riello UPS display show C02?
- J
  jason99Sep 2, 2025
  If the Riello UPS display shows C02, it could be due to the maintenance bypass isolator (SWMB) being closed. Open the isolator (SWMB) located behind the door. Alternatively, the jumper may be missing from the terminals for the remote maintenance bypass (J2). Insert the jumper.
X
xowensSep 4, 2025
What does it mean if my Riello MST 40 display shows A13, A14, or A15?
- W
  williamschristianSep 4, 2025
  If the Riello UPS display shows one or more of the following codes: A13, A14, A15, it indicates that the protection device upstream from the bypass line is open (only if the bypass is separate). Restore the protection device upstream, but first check that there is no overload or short circuit at the output of the UPS. Alternatively, the bypass isolator (SWBYP) may be open (only if the bypass is separate). Close the isolator located behind the door.
X
xyoungSep 6, 2025
What should I do if my Riello MST 40 display shows F11, F14, F15, F16, F17, L06, L07, L08, L09, L14, L15, L16, L17, L18, L19, L20, L21, or L22?
- A
  ashley97Sep 6, 2025
  If the Riello UPS display shows one or more of the following codes: F11, F14, F15, F16, F17, L06, L07, L08, L09, L14, L15, L16, L17, L18, L19, L20, L21, L22, it could be due to anomalous loads applied. Remove the load. Insert the maintenance bypass (SWMB), turn the UPS off and back on again, and then exclude the maintenance bypass. Alternatively, it could be a fault in the input or output stage of the UPS. Activate the maintenance bypass (SWMB), turn the UPS off and back on again, and then exclude the maintenance bypass.
S
Scott SmithSep 8, 2025
What does it mean if my Riello UPS display shows F09 or F10?
- S
  Samuel HowardSep 8, 2025
  If the Riello UPS display shows one or more of the following codes: F09, F10, it indicates a fault in the input stage of the UPS. Activate the maintenance bypass (SWMB), turn the UPS off and back on again, and then exclude the maintenance bypass. Alternatively, phase 1 may have a much lower voltage than the other two phases. Open the SWIN, switch on the UPS from the battery, wait for the sequence to be completed, and then close the SWIN.

Summary

Introduction and Environmental Aspects

Manual Introduction and Purpose

Welcomes the user and outlines the manual's content and purpose.

Environmental Protection and Material Information

Details the company's environmental policies and product material choices.

Product Disposal Guidelines for Hazardous Waste

Provides guidelines for the proper disposal of UPS components considered hazardous waste.

UPS Overview

Front View and Component Identification

Identifies key components visible on the front panel of the UPS.

Rear View and Connection Points

Identifies components and connection points on the rear panel of the UPS.

Control Panel and Display Features

Explains the UPS control panel, display areas, and button functions.

Bypass Input and Transformer Options

Details optional separate bypass input and internal transformer configurations.

UPS Installation

Storage, Preparation, and Environment

Guidelines for storing, preparing the UPS, and environmental requirements.

Installation Environment and EMC Compliance

Requirements for the installation area and electromagnetic compatibility.

Internal Batteries and Handling Safety

Safety precautions for installing and handling internal UPS batteries.

Pallet Removal and Unit Positioning

Instructions for safely removing the UPS from its pallet and positioning it.

Electrical Connections and Cabling Guidance

Guidance on cable cross-sections, routing, and terminal connections.

Bypass, Sync, and Battery Box Connections

Instructions for connecting bypass, synchronization, and external battery box.

UPS Operation and Configuration

System Description and Startup Procedures

Overview of UPS function, block diagram, and startup steps.

Operating Modes and Maintenance Bypass

Explanation of different operating modes and maintenance bypass functions.

Power Management and Features

Details on auxiliary sockets, power walk-in, and power reduction.

UPS Configuration and Settings Guide

Comprehensive guide to configuring UPS settings via control panel or software.

Communication Ports, Software, and Alarms

Information on communication ports, software, buzzer signals, and alarms.

Troubleshooting and Alarm Codes

Common Problems and Solutions

Table of common UPS issues and their troubleshooting steps.

Status, Commands, and Warning Codes

Explanation of UPS status, command, and warning codes.

Anomalies, Faults, and Lock Conditions

Detailed list and descriptions of UPS anomalies, faults, and lock conditions.

Technical Data

Input and Output Specifications

Detailed technical data for the UPS input and output stages.

Performance, Efficiency, and Environmental Data

Specifications on battery charging, modes, performance, and ambient temperature.