Salicru SLC X-PERT Series, User Manual

12

SALICRU

Mains

Mains

Output

Fig. 8. 

Load powered through the bypass line.

4.6.4.  Battery operation.

In the event of power failure or rectifier fault, the batteries 

will power the inverter without interruption. The voltage of the 

batteries decreases depending on the value of the discharge 

current. The drop in voltage does not affect the output voltage, 

which remains constant thanks to pulse width modulation 

(PWM).

In the event that supply is restored before the batteries are 

completely discharged, the system will return to normal 

operation automatically. If it is not, the inverter shuts down and 

the load is transferred to the bypass line (bypass operation). 

If the bypass line is not available or is outside the tolerance 

limits, the powering of the load is interrupted as soon as the 

batteries reach the discharge threshold limit (black-out).

As soon as the power is restored, the rectifier will recharge 

the batteries. In the standard configuration, the loads are 

powered again through the SSB static switch when mains 

power becomes available again. The inverter restarts when the 

batteries have partially recovered their capacity.

System restart from a condition of discharged batteries 

(

black-out

) can be customised according to the needs of the 

device in three ways:

ˆ

Bypass. The loads are powered as soon as the bypass 

line is available (factory setting).

ˆ

Inverter. The loads are powered through the inverter 

(even if the bypass line is available) when the battery 

voltage has reached the programmed threshold/level 

after the restart of the rectifier. This involves additional 

waiting time (which will depend on how discharged the 

batteries are) to power the loads from the moment the 

bypass is enabled.

ˆ

Manual inverter. The output power is not restored 

automatically. The system requires a confirmation 

to restart, which can be done manually by the user 

through the front panel.

Output

Mains

Mains

Fig. 9. 

Battery operation.

4.6.5.  Manual bypass.

Intervention of the manual bypass is necessary whenever 

it is required to verify the functionality of the UPS, or during 

maintenance or repair work.

Output

Mains

Mains

Fig. 10. 

Manual bypass for function checks.

Follow the procedures described in the manual.

The switching and return sequence of the manual 

bypass must be carried out in accordance with the procedure 

indicated in the relevant chapter of this document. The user will 

be solely responsible for any faults caused to the UPS, loads 

and/or installation as a result of incorrect actions.

Wiring of the auxiliary contacts.

Carry out an appropriate electrical installation by 

connecting the auxiliary contacts of the manual bypass and 

the output circuit breaker to the relevant terminals of the 

UPS. This will allow the control logic to acquire the state of 

the switches and guide the operator during start and manual 

bypass procedures.

While the device is in manual bypass mode for repairs or 

maintenance, the UPS is completely switched off and the load 

is powered directly through the bypass line.

Output

Mains

Fig. 11. 

Manual bypass for repairs or maintenance.

4.7.  OPERATION AND CONTROL DEVICES.

The UPS’s operation and control devices are indicated below:

•

Rectifier circuit breaker (RCB)

•

Static bypass circuit breaker (SBCB)

•

UPS output circuit breaker (OCB)

•

Manual bypass circuit breaker (MBCB)

•

Battery circuit breaker/switch (BCB). External, in the battery 

cabinet

•

Emergency power off button (EPO)

•

Normal/Bypass selector

•

Control panel with LCD display (powers between 80...160kVA) 

or touch screen (powers between 200...300kVA)