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8.2.3 Shut down of a single unit UPS in a parallel system
INITIAL SITUATION:
The load is powered by the UPS redundant parallel system.
One unit of the system has to be turned Off, while the load is shared between the
other units supplying the parallel bus.
WARNING!
The control bus cable connecting J52 (A) and J62 (B) cannot be connected or
disconnected after the system has been powered on.
1.
Press key "O" and keep it pressed until the inverter switches OFF, and LED 5 is OFF on the
control panel only of this unit.
With redundant system, pressing the key OFF the inverter shuts down and it will stay OFF.
(If by pressing the key "O" the load is transferred to the mains and the inverter remains operating, it
means the system is not redundant.
In this case is not possible to switch-OFF one unit without transferring the load on mains).
The LCD display of this unit must indicate "LOAD ON INVERTER".
The LEDs 1, 2, 3, 4b and 8 are ON.
The LEDs 4a, 5, 6, 7 and 9 are OFF.
NOTE!
Not following this procedure can cause protected loads to shut down!
2.
Open the circuit breaker Q1 only on this unit.
LED 7 and "service check" is now lit, LED 6 is OFF.
3.
Press the push-button "load off" only on this unit underneath the sliding red safety cover.
LED 7 is OFF.
4.
Open the circuit breaker Q4 only on this unit.
The rectifier turns OFF.
5.
Disconnect the battery by removing the external battery circuit breaker or battery fuses only of
this unit.
WARNING!
It will take 5 minutes for the DC capacitors to discharge.
Verify on LCD screen (battery metering) the DC voltage level.
6.
Open the mains input isolators (rectifier and bypass if separated) only of this unit.
The LCD screen and all the LEDs of the mimic diagram must be OFF.
WARNING!
Output bus bars are still live!
Modifications reserved
OPM_SPE_XXX_60K_60K_7GB_V010.doc
Pagina 75/90
Operatine Manual SitePro 60 kVA
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