Troubleshooting - Riello 100 kVA Manual

Irregular UPS operation is most likely not an indication of a fault but due to simple problems or distraction.
It is therefore advisable to consult the table below carefully as it summarises information which is useful for solving the
most common problems.
CAUTION: the table below often mentions the use of the maintenance BYPASS. It should be noted that before
re-establishing correct UPS operation, it is necessary to check that it is on and not in STAND-BY mode.
If in stand-by mode, switch on the UPS by accessing the "SYSTEM ON" menu and wait until the power-on
sequence has been completed before removing the maintenance BYPASS.
For further details read the sequence described in the BYPASS for maintenance (SWMB) paragraph very
carefully.
N.B. In order to understand the exact meaning of the codes used in the table, refer to the "ALARM CODES" paragraph.
PROBLEM
WITH MAINS VOLTAGE
PRESENT, THE UPS
DOES NOT SWITCH TO
STAND-BY MODE
(THE RED LOCK/STAND-
BY LED DOES IS NOT
FLASHING, NO BEEP IS
EMITTED AND THE
DISPLAY DOES NOT
COME ON)
NO VOLTAGE REACHES
THE LOAD
THE UPS IS OPERATING
FROM THE BATTERY
DESPITE THE
PRESENCE OF MAINS
VOLTAGE

TROUBLESHOOTING

POSSIBLE CAUSE
NO CONNECTION TO THE
INPUT TERMINALS
NO NEUTRAL CONNECTION
THE ISOLATING SWITCH
BEHIND THE DOOR (SWIN) IS
OPEN
NO MAINS VOLTAGE
(BLACKOUT)
UPSTREAM PROTECTION
DEVICE INTERVENTION
NO CONNECTION TO THE
OUTPUT TERMINALS
THE ISOLATING SWITCH
BEHIND THE DOOR (SWOUT)
IS OPEN
THE UPS IS IN STAND-BY
MODE
STAND-BY OFF MODE IS
SELECTED
UPS MALFUNCTIONING AND
AUTOMATIC BYPASS OUT OF
ORDER
UPSTREAM PROTECTION
DEVICE INTERVENTION
THE INPUT VOLTAGE IS
OUTSIDE THE ACCEPTED
TOLERANCE RANGE FOR
MAINS OPERATION
SOLUTION
Connect the mains to the terminals as shown in the
Installation paragraph
The UPS cannot operate without a neutral connection.
CAUTION: The absence of this connection may
damage the UPS and/or the load.
Connect the mains to the terminals as shown in the
Installation paragraph
Close the isolating switch
Check that electrical mains voltage is present. If
necessary, power the load from the battery.
Reset the protection device. Caution: check that no
overload or short circuit is present at the UPS output.
Connect the load to the terminals
Close the isolating switch
Perform the power-on sequence
It is necessary to change the mode. The STAND-BY
OFF (emergency power supply) mode, in fact, only
powers the load in the event of a blackout.
Activate the maintenance bypass (SWMB) and contact
the nearest assistance centre.
Reset the protection device.
CAUTION: Check that no overload or short circuit is
present at the UPS output.
Problem with the mains. Wait until the input mains
voltage returns within the tolerance range. The UPS will
automatically return to mains operation.