APC MGE 6739380EN/JC User Manual download pdf (Page 11)

6739380EN/JC - Page 11

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Example of an installation with an engine generator set

Installation with an engine

generator set

(figure 15)

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.

Fig. 15

UPS shutdown or overload

(systems with a static switch

module)

(figure 16)

Single-unit UPSs, modular UPSs or

UPSs with an SSC:

◗ 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.

Fig. 16

mains 2

mains 1

Galaxy

G

main LV

switchboard

generator

HV

network

mains 1

rectifier-

charger

battery

inverter

load

static switch

mains 2

Introduction (cont.)

This system requires correct transfer

conditions. If the conditions are not

correct, the inverter will current limit to

160% 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 5 off,

◗◗ buzzer 1 on,

◗◗ red "load not protected" light 2 on.

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