PRIMARY SUPPLY FAIL
Is mains voltage present and within tolerance (230 V +– 20%) at UPS terminals U, V, W versus N ?
NO–> Look for reason
YES–> Is mains voltage present downstream S1 (wires 5, 6, 7, versus 8) ? NO–> Check integrity of S1
YES–> Are fuses F1M, F2M, F3M on board SP10 blown ?
YES–> Replace fuses.(If they blow again, replace SP10) NO–> Replace board SP5. Solved ?
NO–> Replace board SP1.
PHASE SEQUENCE ERROR
Have the upstream connections to UPS been modified ? YES–> Correct the connections to UPS terminals
NO–> Is mains voltage present and within tolerance (230 V +– 20%) at UPS terminals U, V, W versus N ?
NO–> Look for reason
YES–> Are fuses F1M, F2M, F3M on board SP10 blown ?
YES–> Replace fuses.(If they blow again, replace SP10) NO–> Replace board SP3. Solved ?
NO–> Replace board SP5.
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
BATTERY FAULT
Is contactor RLA closed ?
NO–> Check for integrity of RLA, eventually replace SP1 (board driving RLA) YES–> Warning !! (During following steps the load will be supplied from mains,
therefore take needed precautions.)
Go into Manual Maintenance Bypass mode following related instructions. With a DC DVM read battery voltage at terminals 1M, pins (+VE, –VE in 10, 15, 20 kVA) (+,– in 30, 40, 50, 60 kVA). Is it higher than 240 V for 1st case and higher than 330 V for 2nd case ? NO–> Check for integrity of battery fuse and of all connections
between UPS and batteries, and between all battery blocks YES–> Return to Normal mode following related instruction. Wait for battery voltage to stabilize at float level. With a DC DVM read voltage across each battery block. It must be within following tolerance:
Block voltage = (Total battery voltage /number of blocks ) +– 3%
Battery blocks outside above tolerance should be considered as faulty and replaced with same type and same manufacturer blocks. If the battery has been in operation longer than 50% of expected life, consideration should be given to the possibility to replace the complete battery:
contact supplier. For more details see IN FIELD BATTERY REPLACEMENT PROCEDURE.
BATT. CONTACTOR OPEN Is DC VOLTAGE HIGH present ?
YES–> See related instruction
NO–> Is DC VOLTAGE LOW present ? YES–> See related instruction
NO–> Is BYPASS SWITCH CLOSED (Inverter page) present ? YES–> See related instruction
NO–> Is green led DL1 on SP11 lit ? YES–> Replace SP1 NO–> Replace SP11
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
BATTERY DISCHARGING
Is PRIMARY SUPPLY FAIL present ? YES–> See related instruction NO–> Replace SP3. Solved ?
NO–> With a DC DVM read battery voltage and compare with reading on display. If display outside +– 1% tolerance, adjust the reading by turning P8 on SP1. Solved ?
NO–> Replace SP1 SHUTDOWN IMMINENT
This alarm appears near the end of battery discharge, to warn user before Inverter switching off. See BATTERY DISCHARGING instructions.
DC VOLTAGE HIGH Replace SP3. Solved ?
NO–> With a DC DVM read battery voltage and compare with reading on display.
If display outside +– 1% tolerance, adjust the reading by turning P8 on SP1. Solved ?
NO–> Replace SP1 DC VOLTAGE LOW
Is PRIMARY SUPPLY FAIL present ? YES–> See related instruction
NO–> See DC VOLTAGE HIGH instruction INPUT BREAKER OPEN
Is S1 open ?
YES–> Understand the reason and close it
NO–> Check for integrity of auxiliary contact of S1 and its connections BATTERY CHARGER INHIBITED
This command is given from outside the UPS. Check connections and external contacts connected to terminal 1M, pins 3–4 (open contact = inhibit)
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
INVERTER
EPO
This command is given from outside the UPS. Is an EPO (Emergency Power Off) command present ?
YES–> Understand the reason and switch off the external command
NO–> Check for external contact(s) and connections to terminal 1M, pins 1–2 (open = EPO). Solved ?
NO–> Replace SP1 OUT OF SYNC
Occasional OUT OF SYNC are normal in case of disturbed mains or supply from generator. If the alarm is persisting: is RESERVE FREQ FAULT (load and reserve page) present ?
YES–> See related instruction NO–> Replace SP2
OVERTEMPERATURE
This alarm causes the inverter to stop and the load to be transferred to reserve: this condition remains locked until it is reset pushing Inverter START.
Push Inverter START: does it start?
YES–> Check for reasons of alarm: ambient temperature too high, fans not well running, air inlets and outlets obstructed
NO–> Check on SP2, connector 5PL, pins 1–2: is DC voltage zero ? YES–> Replace SP2
NO–> Is excessive temperature still present on heatsinks and inside UPS ?
YES–> Wait for cooling and check for reasons: ambient temperature too high, fans not well running, air inlets and outlets obstructed
NO–> Check for integrity of thermoswitches and their connections
BYPASS SWITCH CLOSED Is S3 closed ?
YES–> Understand reason and eventually return to Normal mode following related instruction
NO–> Check for integrity of auxiliary contact of S3 and its connections INVERTER NOT RUNNING
Inverter STOP has been operated. Understand reason and operate START.
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
INVERTER INHIBITED
This alarm is generated by following:
BYPASS SWITCH CLOSED DC VOLTAGE HIGH
DC VOLTAGE LOW
STOP DUE TO OVERLOAD EPO
Check for presence of any of above alarms and see related instructions.
INVERTER BLOCKED
This alarm is generated by following:
DESATURATION OVERTEMPERATURE DC VOLTAGE HIGH DC VOLTAGE LOW INVERTER FREQ. FAULT
STATIC SWITCH FAULT (in Inverter page)
Check for presence of any of above alarms and see related instructions.
INVERTER VOLTS HIGH
Operate Inverter START and the alarm is reset. Does it come back again after a while?
YES–> Note: this alarm causes the Inverter to be stopped, therefore following checks must be performed operating each time START in order to start temporarily the Inverter.
With a DC DVM measure on SP1 the voltages at TP9, TP7, TP4 versus 0VA1 (anode of diodes D31,33,37). Operating START, are all 3 voltages overcoming 1 Volt before the alarm becomes active ? YES–> Replace SP2
NO–> Are F1I, F2I, F3I on SP10 blown ?
YES–> Replace fuses. If they blow again, replace SP10 NO–> Replace SP1
INVERTER VOLTS LOW
Operate Inverter START and the alarm is reset. Does it come back again after a while?
YES–> Replace SP2 OVERLOAD
Check for load level and eventually reduce it or balance it better between phases.
Note: when this alarm is persistent, it causes STOP DUE TO OVERLOAD and the load is transferred to reserve.
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
STOP DUE TO OVERLOAD See OVERLOAD instructions CURRENT LIMIT
Is OVERLOAD present ?
YES–> See related instruction
NO–> The alarm is due to a load drawing highly distorted current (with high Pk.F) from one or more phases. Check on display (Load Measures page) if one or more phases are loaded at high % with Pk.F higher than 3 and redistribute the loads to obtain lower and more balanced Pk.F on the 3 phases.
STATIC SWITCH FAULT
Check for integrity of Inverter Static Switch SCRs: with Inverter in STOP and load on reserve, using an AC DVM read the voltage at wires 19, 20, 21, versus 42 (neutral).
If you read more than 70 Volts the SCRs of that phase are faulty. Replace with same type and same manufacturer.
SYSTEM TEST MODE
Switch 1–8 on SP5 is in ON position. This is a test condition that excludes following alarms:
OVERLOAD
DC VOLTAGE HIGH DC VOLTAGE LOW
Is switch 1–8 in ON position ?
YES–> Understand reason and move it to OFF NO–> Replace SP5
Para 6.1 = TROUBLE SHOOTING ( FSB < 30 )
DESATURATION
Operate Inverter START. Does it start ?
YES–> Check for integrity of Static Switches and level of load for each phase.
Investigate if any heavy step load can occur.
NO–> With Inverter in OFF, read with a DC DVM the voltage across the power transistors (Emitter to Collector). It must be around 50% of total DC BUS voltage. Is this correct ?
NO–> Replace power transistor showing low voltage, replace transistor on same branch (therefore showing high voltage), replace Driver board ( SP8 A or B or C) of same branch.
YES–> Check for correct supply voltages on Driver boards (+7.5, –11.5 Volt). Are these correct ?
NO–> If all Driver boards show wrong supply voltage, then replace SP11, otherwise replace the Driver board(s) showing the wrong supply voltage YES–> Replace SP2. Solved ?
NO–> Replace one by one the Driver boards