Riello MST 30 - User Manual

Questions and Answers

B
Bailey HallAug 20, 2025
What to do if my Riello MST 30 UPS is connected to the mains but does not switch to standby mode?
- C
  Cody WilliamsAug 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.
V
Vincent BennettAug 25, 2025
What should I do if my Riello MST 30 display shows F37, L37?
- P
  Paul FrostAug 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.
B
Brian JenkinsAug 26, 2025
What does it mean when my Riello MST 30 UPS display shows L26, L27, or L28?
- O
  omckinneyAug 27, 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
levyaprilAug 28, 2025
What does it mean if my Riello MST 30 display shows A39, A40 and the red 'Replace Batteries' LED is on?
- R
  Rebecca PhillipsAug 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.
P
Patricia SuarezAug 29, 2025
How to resolve a no power issue to the load with my Riello MST 30 UPS?
- S
  Sara Morris PhDAug 29, 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).
D
David MartinezAug 31, 2025
What does code S06 mean on my Riello MST 30 display?
- V
  vvargasSep 1, 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.
R
Regina HudsonSep 2, 2025
Why does my Riello MST 30 display show C02?
- T
  Tony KirbySep 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.
M
Margaret McfarlandSep 4, 2025
What does it mean if my Riello MST 30 UPS display shows A13, A14, or A15?
- M
  Michael FloydSep 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.
L
Lisa MorrisSep 6, 2025
What should I do if my Riello MST 30 display shows F11, F14, F15, F16, F17, L06, L07, L08, L09, L14, L15, L16, L17, L18, L19, L20, L21, or L22?
- D
  Darrell LeeSep 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.
J
Jonathan VincentSep 8, 2025
What does it mean if my Riello UPS display shows F09 or F10?
- C
  colton00Sep 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

Internal Batteries Safety and Handling

Internal Batteries Safety Precautions

Provides crucial safety warnings for handling internal batteries and hazardous voltages.

Battery Replacement Warning

Warns about explosion risk with incorrect battery types and provides replacement guidance.

UPS Removal and Positioning

Two-Person Operation Requirement

Highlights instructions that require two-person operation for safety and handling.

Electrical Connection Diagrams

System Requirements for Connections

Warns about the requirement for a 4-wire three-phase distribution system.

Standard Electrical Connection Diagrams

Illustrates connection diagrams for different UPS configurations without neutral modification.

UPS Internal Protections and Fault Handling

Internal Protections Overview

Details UPS isolators, battery fuses, and input/output currents.

External Protection Devices

Circuit Breaker Recommendations

Recommends circuit breakers upstream of the UPS and specifies ratings.

Cable Cross-Sections and Connections

Mandatory Neutral Connections

Emphasizes connecting the input neutral and warns against connecting output to input neutral.

Connections for Separate Bypass Models

Connection Procedures for Separate Bypass

Details connection procedures for models with separate bypass, including neutral handling.

Remote Maintenance Bypass Connection

Installing a Remote Maintenance Bypass

Details installing a bypass for UPS replacement without power interruption.

Service Bypass Terminal Connection Importance

Stresses connecting the 'SERVICE BYPASS' terminal to the auxiliary contact.

UPS Startup and Shutdown Procedures

Mains Start-Up Process

Details the procedure for starting the UPS using the mains power.

Battery Start-Up (Cold Start)

Explains how to start the UPS using only battery power.

Correct UPS Shutdown Procedure

Provides the correct steps for turning off the UPS.

UPS Operating Modes and Maintenance Bypass

Explanation of Operating Modes

Explains ON LINE, ECO, SMART ACTIVE, and STAND-BY OFF modes and their functionalities.

Maintenance Bypass (SWMB) Procedure

Details the procedure for using the maintenance bypass for safe maintenance.

Critical Maintenance Safety Warning

A critical safety warning for performing maintenance inside the UPS.

Configuring UPS Parameters

UPS Communication Ports

Available Communication Ports

Lists Serial (RS232/USB) ports and expansion slots for communication boards.

UPS Software and Configuration

Monitoring and Control Software

Introduces PowerShield³ software for UPS management and monitoring.

Configuration Software Usage

Mentions special software for configuring important UPS parameters.

Troubleshooting Common UPS Issues

UPS Not Switching to Stand-By Mode

Addresses issues where the UPS fails to enter stand-by mode.

No Power Reaching the Load

Troubleshoots scenarios where the load is not receiving power from the UPS.

UPS Operating on Battery with Mains Present

Helps resolve UPS operating on battery despite mains power availability.

Input Voltage Outside Operating Range

Addresses issues related to input voltage falling outside acceptable ranges.

Detailed Troubleshooting Codes

Startup Failures (Codes A30-A34)

Troubleshoots startup failures due to temperature or probe faults.

Phase Voltage Imbalance (Codes F09, F10)

Addresses voltage imbalance issues between input phases.

Load and Connection Faults (Codes F03-F44)

Covers faults related to anomalous loads, connections, and fuses.

Advanced Troubleshooting Scenarios

Bypass Protection and Isolator Issues

Solves issues with upstream bypass protection devices or bypass isolator.

Battery Charger and Fuse Faults

Addresses battery charger faults and blown battery fuses.

Input Relay and Load Issues

Deals with input relay locks and situations where the applied load is too high.

Output Overload and Short Circuit

Addresses output overloads and short circuits at the output.

Critical Faults and System Anomalies

Battery Replacement Recommendations (Codes A39-A40)

Indicates battery failure in efficiency tests, recommending replacement.

Temperature and Ventilation Faults

Troubleshoots high temperatures, heat sources, or obstructed ventilation slits.

Static Bypass Faults

Solves issues with static bypass rupture or fault.

Display and Power Supply Problems

Addresses issues with the UPS display or its power supply.

UPS Status and Alarm Codes Explained

UPS Anomalies and Performance Reduction

Inverter Synchronization and Frequency Anomalies

Covers inverter synchronization issues and frequency tolerance deviations.

Input Voltage and Bypass Line Anomalies

Addresses over/undervoltages on input and bypass lines.

Battery Status and Temperature Anomalies

Reports missing batteries, open fuses, and temperature probe issues.

Load and Output Status Anomalies

Covers high current peaks, load threshold breaches, and open output isolators.

Critical UPS Faults

Communication and Phase Faults

Reports internal communication errors and incorrect input phase sequences.

Input Stage Faults

Covers faults related to input fuses, relays, and precharge circuits.

Inverter and Battery Faults

Addresses inverter stage anomalies and battery over/undervoltages.

Output and Charger Stage Faults

UPS Lock Conditions

Auxiliary Power and Cable Faults

Input;Output Relay and Bypass Lock Faults

Inverter and Output Stage Lock Faults

Temperature and Fuse Related Locks

Technical Data Specifications

Summary

Internal Batteries Safety and Handling

Internal Batteries Safety Precautions

Provides crucial safety warnings for handling internal batteries and hazardous voltages.

Battery Replacement Warning

Warns about explosion risk with incorrect battery types and provides replacement guidance.

UPS Removal and Positioning

Two-Person Operation Requirement

Highlights instructions that require two-person operation for safety and handling.

Electrical Connection Diagrams

System Requirements for Connections

Warns about the requirement for a 4-wire three-phase distribution system.

Standard Electrical Connection Diagrams

Illustrates connection diagrams for different UPS configurations without neutral modification.

UPS Internal Protections and Fault Handling

Internal Protections Overview

Details UPS isolators, battery fuses, and input/output currents.

External Protection Devices

Circuit Breaker Recommendations

Recommends circuit breakers upstream of the UPS and specifies ratings.

Cable Cross-Sections and Connections

Mandatory Neutral Connections

Emphasizes connecting the input neutral and warns against connecting output to input neutral.

Connections for Separate Bypass Models

Connection Procedures for Separate Bypass

Details connection procedures for models with separate bypass, including neutral handling.

Remote Maintenance Bypass Connection

Installing a Remote Maintenance Bypass

Details installing a bypass for UPS replacement without power interruption.

Service Bypass Terminal Connection Importance

Stresses connecting the 'SERVICE BYPASS' terminal to the auxiliary contact.

UPS Startup and Shutdown Procedures

Mains Start-Up Process

Details the procedure for starting the UPS using the mains power.

Battery Start-Up (Cold Start)

Explains how to start the UPS using only battery power.

Correct UPS Shutdown Procedure

Provides the correct steps for turning off the UPS.

UPS Operating Modes and Maintenance Bypass

Explanation of Operating Modes

Explains ON LINE, ECO, SMART ACTIVE, and STAND-BY OFF modes and their functionalities.

Maintenance Bypass (SWMB) Procedure

Details the procedure for using the maintenance bypass for safe maintenance.

Critical Maintenance Safety Warning

A critical safety warning for performing maintenance inside the UPS.

Configuring UPS Parameters

UPS Communication Ports

Available Communication Ports

Lists Serial (RS232/USB) ports and expansion slots for communication boards.

UPS Software and Configuration

Monitoring and Control Software

Introduces PowerShield³ software for UPS management and monitoring.

Configuration Software Usage

Mentions special software for configuring important UPS parameters.

Troubleshooting Common UPS Issues

UPS Not Switching to Stand-By Mode

Addresses issues where the UPS fails to enter stand-by mode.

No Power Reaching the Load

Troubleshoots scenarios where the load is not receiving power from the UPS.

UPS Operating on Battery with Mains Present

Helps resolve UPS operating on battery despite mains power availability.

Input Voltage Outside Operating Range

Addresses issues related to input voltage falling outside acceptable ranges.

Detailed Troubleshooting Codes

Startup Failures (Codes A30-A34)

Troubleshoots startup failures due to temperature or probe faults.

Phase Voltage Imbalance (Codes F09, F10)

Addresses voltage imbalance issues between input phases.

Load and Connection Faults (Codes F03-F44)

Covers faults related to anomalous loads, connections, and fuses.

Advanced Troubleshooting Scenarios

Bypass Protection and Isolator Issues

Solves issues with upstream bypass protection devices or bypass isolator.

Battery Charger and Fuse Faults

Addresses battery charger faults and blown battery fuses.

Input Relay and Load Issues

Deals with input relay locks and situations where the applied load is too high.

Output Overload and Short Circuit

Addresses output overloads and short circuits at the output.

Critical Faults and System Anomalies

Battery Replacement Recommendations (Codes A39-A40)

Indicates battery failure in efficiency tests, recommending replacement.

Temperature and Ventilation Faults

Troubleshoots high temperatures, heat sources, or obstructed ventilation slits.

Static Bypass Faults

Solves issues with static bypass rupture or fault.

Display and Power Supply Problems

Addresses issues with the UPS display or its power supply.

UPS Status and Alarm Codes Explained

UPS Anomalies and Performance Reduction

Inverter Synchronization and Frequency Anomalies

Covers inverter synchronization issues and frequency tolerance deviations.

Input Voltage and Bypass Line Anomalies

Addresses over/undervoltages on input and bypass lines.

Battery Status and Temperature Anomalies

Reports missing batteries, open fuses, and temperature probe issues.

Load and Output Status Anomalies

Covers high current peaks, load threshold breaches, and open output isolators.

Critical UPS Faults

Communication and Phase Faults

Reports internal communication errors and incorrect input phase sequences.

Input Stage Faults

Covers faults related to input fuses, relays, and precharge circuits.

Inverter and Battery Faults

Addresses inverter stage anomalies and battery over/undervoltages.

Output and Charger Stage Faults

UPS Lock Conditions

Auxiliary Power and Cable Faults

Input;Output Relay and Bypass Lock Faults

Inverter and Output Stage Lock Faults

Temperature and Fuse Related Locks

Technical Data Specifications

Riello MST 30 Specifications

General

Brand	Riello
Model	MST 30
Category	UPS
Language	English

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Riello MST 30 - User Manual

Table of Contents

Questions and Answers

Summary

Internal Batteries Safety and Handling

Internal Batteries Safety Precautions

Battery Replacement Warning

UPS Removal and Positioning

Two-Person Operation Requirement

Electrical Connection Diagrams

System Requirements for Connections

Standard Electrical Connection Diagrams

UPS Internal Protections and Fault Handling

Internal Protections Overview

External Protection Devices

Circuit Breaker Recommendations

Cable Cross-Sections and Connections

Mandatory Neutral Connections

Connections for Separate Bypass Models

Connection Procedures for Separate Bypass

Remote Maintenance Bypass Connection

Installing a Remote Maintenance Bypass

Service Bypass Terminal Connection Importance

UPS Startup and Shutdown Procedures

Mains Start-Up Process

Battery Start-Up (Cold Start)

Correct UPS Shutdown Procedure

UPS Operating Modes and Maintenance Bypass

Explanation of Operating Modes

Maintenance Bypass (SWMB) Procedure

Critical Maintenance Safety Warning

Configuring UPS Parameters

UPS Communication Ports

Available Communication Ports

UPS Software and Configuration

Monitoring and Control Software

Configuration Software Usage

Troubleshooting Common UPS Issues

UPS Not Switching to Stand-By Mode

No Power Reaching the Load

UPS Operating on Battery with Mains Present

Input Voltage Outside Operating Range

Detailed Troubleshooting Codes

Startup Failures (Codes A30-A34)

Phase Voltage Imbalance (Codes F09, F10)

Load and Connection Faults (Codes F03-F44)

Advanced Troubleshooting Scenarios

Bypass Protection and Isolator Issues

Battery Charger and Fuse Faults

Input Relay and Load Issues

Output Overload and Short Circuit

Critical Faults and System Anomalies

Battery Replacement Recommendations (Codes A39-A40)

Temperature and Ventilation Faults

Static Bypass Faults

Display and Power Supply Problems

UPS Status and Alarm Codes Explained

UPS Anomalies and Performance Reduction

Inverter Synchronization and Frequency Anomalies

Input Voltage and Bypass Line Anomalies

Battery Status and Temperature Anomalies

Load and Output Status Anomalies

Critical UPS Faults

Communication and Phase Faults

Input Stage Faults

Inverter and Battery Faults

Output and Charger Stage Faults

UPS Lock Conditions

Auxiliary Power and Cable Faults

Input;Output Relay and Bypass Lock Faults

Inverter and Output Stage Lock Faults

Temperature and Fuse Related Locks

Technical Data Specifications

Summary

Internal Batteries Safety and Handling

Internal Batteries Safety Precautions

Battery Replacement Warning

UPS Removal and Positioning

Two-Person Operation Requirement

Electrical Connection Diagrams