As part of the building management systems and IT rooms, your Riello UPS will Identify and raise an alarm to notify you, if and when something is wrong.

However identifying whether your UPS requires immediate repairs can be difficult and trying to locate the service records or user manual is not always easy.

Constant Power Services have provided some of the more common alarm codes for your information.

Need help identifying your UPS alarm code?

Alarm Code

Status

Description

S04

LOAD ON BYPASS

Load powered from bypass line

S06

BATTERY WORKING

Battery operation

S10

LOCK-LOAD OFF

UPS locked: load not powered

S11

LOCK-LOAD ON BYPASS

UPS locked: load powered by bypass line

S12

LOCK-STAND BY

BOOST stage or battery charger locked – load not powered

C05

MANUAL BYPASS COMMAND

Manual bypass active

C08

BYPASS COMMAND ACTIVE

Command active to power the load by the bypass line (from the panel)

W01

BATTERY LOW WARNING

End of discharge pre-alarm

W07

SERVICE UPS

Maintenance of the UPS must be performed

W08

SERVICE BAT

Maintenance of the batteries must be performed

Further Faults and Causes

Constant Power Services are always on hand to discuss any potential problems or queries you may have with both existing installations and new. Below we have described some common or possible faults that may occur and the reason for these.

Alarm or Issue

Possible Causes

Mains Failure or Input Switch Open

The UPS is supplying the load from the battery



There is a power cut and the UPS operating correctly


If the UPS displays the input voltage & frequency, check to see whether they are present and correct. If the voltage or frequency is too low or high the UPS will operate on battery.


A Breaker has tripped upstream from the UPS. Check why the breaker has tripped, and if safe to do so reset the switch.


The UPS is alarming bypass fault

The bypass voltage or frequency is out of limits to be able to feed the load:



Check the Bypass voltage & frequency. It is likely either the mains voltage is low or high


The UPS is operating from a generator with unstable frequency or poor quality waveform.


There is a power cut on the bypass supply and the UPS operating correctly


A Breaker has tripped upstream from the UPS. Check why the breaker has tripped, and if safe to do so reset the switch.


The UPS has Asynchronous Alarms

The bypass frequency is out of limits or rapidly changing:



It is likely the UPS is operating from a generator with unstable frequency or poor quality waveform.


Battery not present or fault

The UPS has tested the battery and found some issue so that full autonomy is not available:




There are low battery blocks within the battery.


The battery has been disconnected from the system by the opening or a fuse or switch.


The battery is low following an extended


High Temperature or fan fail

There is a high temperature within the UPS system:



Check the ambient temperature is within the UPS specification.


Check that all the fans are operating correctly


On older UPS systems a excessive temperature can indicate leading power factor outside the UPSs limits (effectively an overload).


There is excess heat being generated by a fault battery, Check the battery and Isolate is necessary


Overload

There is an overload on one or more phases of the UPS output:



Check for fan heaters, kettles or other high power items on the UPS output


For three phase UPS Check if the load is balanced evenly across the phases, it may be necessary to move some load to another phase


What Our Customers Think

You don’t have to just take our word for it…

Based on 12 reviews.
Geoff Craddock
Geoff Craddock
8. December, 2020.
This is a high quality versatile UPS but the documentation and supplied software is not good enough for inexperienced users. My application, providing safe shutdown of the office PC in the event of mains power interruptions, took several days of experimentation to configure and the manual omits much key information.
Steve Day
Steve Day
20. November, 2020.
Arrived on time and completed work to satisfaction. Engineer friendly and approachable.
Direction Fire Ltd
Direction Fire Ltd
7. September, 2020.
CHRIS KEHOE
CHRIS KEHOE
7. September, 2020.
Outstanding service given by the whole team from start to finish. Highly recommend these guys.
doc
doc
7. September, 2020.
Very helpful and understanding of the situation. Good advice and friendly.
Leigh Bruce
Leigh Bruce
4. September, 2020.
Excellent Service from Kevin and his team as usual.
Chris Kehoe
Chris Kehoe
5. August, 2020.
At fairly short notice we required a new UPS system installing in our building. We called CPS and from start to finish, the service was second to none from communication, delivery and installation. I would have no hesitation in recommending CPS for your UPS needs. Chris Kehoe Lead Engineer One Snowhill, Birmingham
Paul McNally
Paul McNally
30. June, 2020.
Absolutely amazing company , providing the top end of customer service! We work at a critical healthcare establishment, and had an urgent issue with our UPS. We contacted CPS and their engineer calmly talked us through the issue. He was currently stationed in Glasgow, and to give us confidence, he was willing to travel all the way to Liverpool to solve the issue and carry out the physical switching. The engineer arrived within 4 hours and presented himself with impeccable customer service skills. Once he attended the issue, he calmly resolved the issue , and the system was back online without any interruption. I cannot underestimate the importance of having such a reliable and competent company on the books. What an amazing service!!!! Many Thanks Paul McNally Vinci Facilities
Brian Feehily
Brian Feehily
11. June, 2020.
Bryan Davies
Bryan Davies
27. May, 2020.
Great Company to work with would highly recommend

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