What should I do if my Riello MCM 20 displays L26 indicating an output short circuit?
If the Riello UPS display shows one or more of the following codes: L26, it indicates an output short circuit. Switch the UPS off. Disconnect all the loads relating to the phases affected by the short circuit. Restart the UPS. Re-connect the loads one at a time in order to identify the fault.
Why is my Riello UPS running on batteries even with mains power?
If the Riello UPS is operating off the batteries even when mains power is available, it could be due to the upstream protection device intervention. In this case, restore the protection, ensuring there is no overload or short circuit on the UPS output. Another reason could be that the input voltage is outside the accepted operating values. If this is the case, wait until the input voltage falls within the tolerance values, and the UPS will automatically switch over to mains power.
What does S07 mean on my Riello UPS display?
If your Riello UPS display shows the code S07, it means the batteries are discharged. The UPS is waiting until the battery voltage rises above the established threshold value. You can either wait for the batteries to recharge or manually force start up from the “START UP” menu.
How to fix Riello MCM 20 UPS not switching to standby mode?
If your Riello UPS is connected to the mains but doesn't switch to standby mode, it could be due to several reasons. First, check the connection to the input terminal, ensuring it follows the installation instructions. A missing neutral connection can also cause this issue; the UPS cannot operate without it, and its absence could cause damage. Also, check the 1/0 switch behind the door and set it to 1 (if present) and make sure that the SWIN switch located behind the door is closed. Finally, verify that mains power is available and that no upstream protection device has been triggered. If a protection device has intervened, restore it after checking for overloads or short circuits.
What does it mean when my Riello MCM 20 displays A39 or A40 and the battery replacement LED is on?
If the Riello UPS display shows one or more of the following codes: A39, A40, and the red “batteries to be replaced” LED is on, it indicates that the batteries have failed the periodic efficiency test. The batteries should be replaced by qualified personnel because they are no longer able to maintain the charge for a sufficient time.
Why is my Riello UPS load powered but the display and fans are off?
If the Riello UPS display is off, the fans are off, but the load is powered, it indicates that due to a fault in the auxiliaries, the UPS is in bypass supported by the redundant power supply. Activate the maintenance bypass (SWMB), shut down the UPS completely and wait for a few seconds. Try to switch on again. If the display does not light up or the sequence fails, contact the nearest technical support centre and leave the UPS in manual bypass mode.
What does it mean when my Riello UPS displays A13?
If the Riello UPS display shows one or more of the following codes: A13, it could be due to the protection upstream of the bypass being open (only for separate bypass). Restore the upstream protection, ensuring there is no overload or short circuit on the UPS output. Another cause could be the bypass switch SWBYP being open (only for separate bypass). Close the switch located behind the door.
What does code L11 mean on my Riello MCM 20 UPS display?
If the Riello UPS display shows the codes: L11, it means there is a breakdown or malfunctioning of the static bypass. Activate the maintenance bypass (SWMB), switch the UPS off and then on again. Exclude the maintenance bypass. If the fault persists, contact the nearest technical support centre.
What should I do if my Riello MCM 20 UPS displays F09 or F10?
If the Riello UPS display shows one or more of the following codes: F09, F10, it may indicate a malfunction at the UPS input stage. Activate the maintenance bypass (SWMB), switch the UPS off and then on again, and exclude the maintenance bypass. If the problem persists, contact the nearest service centre. It is also possible that phase 1 has a much lower voltage than the other two phases. Open the SWIN, start up the UPS using the batteries, wait until the sequence ends, and then close SWIN.
What to do if my Riello UPS displays F37 or L37?
If the Riello UPS display shows one or more of the following codes: F37, L37, it could be due to ambient temperature exceeding 40°C, heat sources near the UPS, obstructed ventilation slits, or a fault in the temperature probe or battery charger cooling system. Eliminate the cause of the overtemperature. Open the battery fuse holder isolators (SWBATT) and wait for the battery charger heat sink to cool down. Close the battery fuse holders. If the problem recurs, contact your local service centre. Never open the SWBATT fuse holders during battery operation.
Information required before proceeding with installation, such as preliminary checks and environmental factors.
Illustrates electrical connection diagrams for various UPS configurations and input types.
Explains the UPS's protection mechanisms against short circuits during normal and battery operation.
Describes the UPS's internal protection against backfeed and the optional relay board output.
Details the initial connection steps, emphasizing earthing and neutral connections.
General| Rated Power | 20 kVA |
|---|---|
| Frequency | 50/60 Hz |
| Technology | Online Double Conversion |
| Battery Type | Valve Regulated Lead Acid (VRLA) |
| Communication | RS232, USB |
| Operating Temperature | 0 - 40 °C |
| Input Voltage | 400 V (3Ph+N) |
| Output Voltage | 400 V (3Ph+N) |
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