Riello UPS CSS SENTINEL TOWER CAM 3, Installation And User Manual

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TROUBLESHOOTING 

An irregular operation of the CPS is frequently not due to malfunctions, but to simple problems, inconveniences or distractions.  
Therefore,  the  user  is  advised  to  consult  the  table  below  providing  useful  information  on  how  to  solve  the  most  common 
problems.  
 

WARNING:

 the table below often refers to the use of the maintenance BYPASS (SWMB). If the device is installed, 

before restoring the correct operation of the CPS, make sure that it is switched on and 

not in STAND-BY

.

 
NOTE: For the exact meaning of the codes mentioned in the table, please read the 

“S

TATUS 

/

A

LARM CODES

”

 section. 

PROBLEM 

POSSIBLE CAUSE 

SOLUTION 

THE CPS CONNECTED TO 

THE MAINS, DOES NOT 

SWITCH TO STAND BY 

MODE 

(THE DISPLAY DOES NOT 

LIGHT UP)

CONNECTION TO THE 

INPUT TERMINAL MISSING 

Connect  the  mains  to  the  terminals  following  the 
indications in the paragraph 

“P

OWER 

C

ONNECTION

”

NEUTRAL CONNECTION 

MISSING 

The CPS cannot function without the neutral connection. 
WARNING:  the  absence  of  this  connection  can  damage 
the  CPS  and/or  the  load.  Connect  the  mains  to  the 
terminals  as  explained  in  the  paragraph 

“P

OWER 

C

ONNECTION

”

. 

THE ISOLATOR (SWIN) IS 

OPEN 

Close the isolator 

MAINS POWER MISSING 

(BLACKOUT) 

Make  sure  the  mains  power  is  present.  If  necessary, 
perform battery start-up to power the load.  

INTERVENTION OF THE 

UPSTREAM PROTECTION 

DEVICE  

Restore  the  protection.  Warning:  make  sure  there  is  no 
overload or short circuit on the CPS output.  

NO POWER REACHES 

THE LOAD

CONNECTION TO THE 

OUTPUT TERMINAL 

MISSING 

Connect the load to the terminals 

THE CPS IS IN STAND-BY 

MODE 

Run the start-up sequence 

THE STAND-BY OFF MODE 

HAS BEEN SELECTED 

The operating mode must be changed. In fact, the STAND-
BY OFF (emergency) mode only powers the loads when a 
black out occurs. 

MALFUNCTION OF THE 

CPS AND AUTOMATIC 

BYPASS OUT OF USE 

Insert the maintenance bypass (SWMB) and contact the 
nearest service centre 

THE CPS OPERATES OFF 

THE BATTERIES EVEN 

THOUGH MAINS POWER 

IS PRESENT

INTERVENTION OF THE 

UPSTREAM PROTECTION 

DEVICE 

Restore the protection. 
WARNING: make sure there is no overload or short circuit 
on the CPS output. 

THE INPUT VOLTAGE IS 

OUT OF THE ALLOWED 

OPERATING VALUES FOR 

MAINS POWER 

Problem caused by the mains power. Wait for the input 
mains voltage to return within the tolerance limits. The 
CPS will return automatically to mains operation.