22
DELPHYS MX 250-900
- Ref.: OPMDELMX1010-GB_01
5. 7.5. System with two redundant units
In a system with two redundant units, only one maintenance bypass can be closed.
5. 7.6. System with two non redundant units or more than two parallel units
In such a system, the maintenance bypass is common to the whole system.
5. 7.7. Uncoupling of a unit
Unit uncoupling can only be achieved if the system is redundant, meaning that it can supply all the energy
required to the load with one unit disconnected.
The uncoupling of a unit is to be made from its control panel by selecting:
•
- the menu "UPS UNIT",
•
- the menu "UNIT COMMANDS"
•
- the submenu "UNIT UNCOUPLING",
At this point the UPS unit is uncoupled but still operating:
•
Open switch Q3 in the appropriate unit to isolate it from the system.
Note: At this point the UPS unit can be autonomously operated.
5. 7.8. Shutdown of a unit
(The unit has been previously uncoupled - See section 5.7.7)
Shutdown the unit in the following chronology order:
•
select the menu "SUBSET COMMAND"
•
select the submenu "INVERTER SHUTDOWN",
•
select the submenu "RECTIFIER SHUTDOWN"
At this point:
•
- open battery protection Q20,
•
- open switch Q4
•
- open switch Q1.
Do not forget that even when the load is stopped the unit is live:
- because of the mains voltage to the rectifier and the bypass.
- because of the residual voltage of the capacitors.
- because of the load voltage coming from the common busbar (downstream of Q3).
5. 7.9. Unit switching on or coupling to the common busbar
C
ONDITIONS
TO
bE
COMpLETED
:
•
The system is live upstream of the UPS unit
•
wait for the control panel to light up,
I
N
THE
CONTROL
pANEL
OF
THE
ADEQUATE
UNIT
,
SUCCESSIVELY
SELECT
:
•
the menu "UPS UNIT"
•
the menu "UNIT COMMANDS"
•
the submenu "AUTOMATIC STARTUP".
The automatic startup is run through an interactive procedure. Just follow the instructions displayed and validate with
the "ENTER" key.
note
: at the end of the start up sequence the unit is coupled to the common busbar and Q3 is closed.
5. MODULAR SYSTEMS
