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34006452EN/AC - Page 12
Introduction
Installation with an engine generator set (figure 15)
UPS shutdown or overload (systems with a static switch module) (figure 16)
Single-unit UPSs, modular UPSs or UPSs with an SSC:
Fig. 16
If a stand-by generator is included in the installation, it is generally started automatically in the event of a Mains failure and
connected to the main low voltage switchboard.
It is disconnected when Mains power is restored.
With such a system, the required battery time may be reduced to the time necessary for starting and bringing on line the
stand-by generator.
The battery supplies power to the inverter during the transfers: Mains -
generator and generator - Mains.
The transfer sequences described: Mains - battery
- generator and generator - battery - Mains are fully automatic.
They in no way affect the load and require no manual operation by the user.
Note:
To avoid load surges on the generator, the rectifier/charger is started with a 10 second maximum current consumption walk-in.
Example of an installation with an engine generator set
Fig. 15
– in the event of a UPS shutdown (initiated by the user or by an internal protective device), the load is automatically
transferred to the Mains 2 bypass line. If transfer conditions are correct, transfer takes place instantly, without interruption to
the load.
Note:
Transfer conditions are not correct when Mains 2 characteristics are outside tolerances (voltage: ±10 %; frequency as per
personalization; phase sync with inverter ±3°);
– in the event of a major transient overload (greater than 160 % of the full load), immediate transfer takes place as above,
without interruption to the load.
When the overload disappears, the load is automatically returned to the inverter depending on the configured value of the
re-transfer counter: no return to inverter, or 1 to 255 (personalized value) overloads accepted before the load is permanently
transferred to Mains 2. This operating mode allows start-up of load devices causing high inrush currents.
This system requires correct transfer conditions. If the conditions are not correct, the inverter will current limit to 150 % of its
rated current for 1 second before stopping;
– in the event of a small but extended overload (i.e. a continuous level of power exceeding the full rated load), the inverter
will continue to supply power for a period depending on the magnitude of the overload (10 minutes for a 125 % overload,
1 minute for a 150 % overload). See figure 17 (Overload curve);
– in all three of the above cases, the inverter shutsdown and supplies the load via Mains 2 with the following information
on the control panel:
– green "load protected" light off,
– buzzer on,
– red "load not protected" light on.
mains 2
mains 1
Galaxy
G
main LV
switchboard
generator
HV
network
5
1
2
I
+
!
!
O
2
beep...beep...
1
mains 1
rectifier-
charger
battery
inverter
load
static switch
mains 2