Hidden control panel

Control panel (cont.)

"Inverter off" button

+ –

This gray button 7 turns the inverter off.

◗press the "inverter off" button 7 for

3 seconds;

◗if the transfer to Mains 2 conditions are correct:

◗the load is transferred without interrupting to Mains 2,

◗the inverter shuts down,

◗ the green "load protected" light 5 goes off and the red "load not protected" light 2 goes on.

◗if the transfer to Mains 2 conditions are not correct, the button produces no effect. A special function on the hidden panel may be used to force the transfer.

Caution:

If the transfer is forced, the load will be subjected to a 0.8 second interruption in the supply of power.

Note:

◗for Modular UPSs or parallel UPSs with SSC, the shutdown of an inverter may or may not result in the transfer of the load to Mains 2, depending on redundancy conditions;

◗if the transfer to Mains 2 conditions are not correct or if the system does not have a Mains 2, the shutdown of a single inverter will result in the shutdown of the entire system if there is no redundancy.

The hidden panel, located behind the hinged cover, offers the following indications and control functions:

◗environment faults;

◗general faults in system modules;

◗special control buttons

(see figure 28).

This panel is identical for all types of cubicles, however, the controls or indications 8 that do not concern a given cubicle are not activated.

Clear fault log

This button 10 clears the alarms stored in memory. The memory may not be cleared until the cause of the alarms has ceased.

Hidden control panel (Inverter and Static Switch Cubicles)

						8
			A B C D E F G H I J K L M N
	fault		1	2		3	4	5
9	10	11	12	13	14	15	16	17

Fig. 28

Buzzer reset

This button 11 stops the buzzer. A new fault starts the buzzer again.

Battery charge cycle

This button 12 starts a battery charge cycle (vented lead-acid batteries only). The cycle duration may be programmed (default value is 24 hours). Then the RC automatically shifts to "floating" mode.

Return to float charge

This button 13 can be used during a charge cycle to force the RC to return to "floating" mode.

Security button

This button 14 avoids inadvertent operation of the remaining three control buttons:

◗Mains 2 synchronization or desynchronization;

◗forced transfer to inverter with load interruption;

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◗forced inverter shutdown with load interruption;

When pressing one of the above three buttons, the security button must also be pressed at the same time.

Mains 2 synchronization or desynchronization

This button 15 desynchronizes or resynchronizes the inverter output frequency with that of Mains 2.

Note:

◗for parallel-connected modular UPSs, this function must be carried out on all the UPSs.

Forced transfer to inverter with load interruption

This button 16 transfers the load to the inverter. If the transfer conditions (Mains 2 characteristics outside tolerances) are not correct, the transfer will result in a 0.8 second interruption in the supply of power to the load.

Note:

◗for parallel-connected modular UPSs, forced transfer of the load will not take place if the number of operating UPSs required by the load is greater than one;

◗for parallel UPSs with centralised SSC, this function is available only on the SSC.

Forced inverter shutdown with load interruption

This button 17 :

◗transfers the load to Mains 2;

◗shuts down the inverter.

It may be used if the transfer conditions (Mains 2 characteristics outside tolerances) are not correct, in which case the "inverter off" button 7 on the visible control panel produces no effect;

◗is disabled on the SSC.