APC MGE 6739380EN/JC User Manual download pdf (Page 8)

Page 8 - 6739380EN/JC

Isolation and protection devices

Example of a single-unit UPS or single modular UPS

Fig. 8

Fig. 9

Static Switch Cubicle

(figure 9)

◗ Q4S (switch):

◗◗ isolation of the static switch (and

mechanical contactor K2S) from

Mains 2;

◗ Q3BP (switch):

◗◗ bypass switch for maintenance;

◗ Q5N (switch):

◗◗ isolation of the load from the parallel

UPSs;

◗ Q1 (fuse switch):

◗◗ protection of the cubicle control

electronics from the parallel-connected

inverter outputs;

◗ Q2 (fuse switch):

◗◗ protection of the cubicle control

electronics from Mains 2.

UPS or converter cubicles

(figure 8)

◗ Q1 (switch):

◗◗ isolation from Mains 1,

◗◗ RC start-up;

◗ QF1 (circuit breaker):

◗◗ battery protection and isolation;

◗ Q5N (switch):

◗◗ isolation of the inverter, frequency

converter or static switch module from

the load;

◗ Q4S (switch):

◗◗ isolation of the static switch from

Mains 2;

◗ Q3BP (switch):

◗◗ bypass switch for maintenance;

◗ FU1-2-3 (fuses):

◗◗ protection of the RC from Mains 1;

◗ FU5-6-7 (fuses):

◗◗ protection of the inverter from the

load.

Note:

◗◗ switches Q4S and Q3BP do not exist

on frequency converters,

◗◗ circuit breaker QF1 does not exist on

frequency converters without a battery.

External maintenance bypass

cubicle (figure 10)

◗ Q3BP (switch):

◗◗ bypass switch for maintenance;

◗ Q5N (switch):

◗◗ isolation of the load from the parallel-

connected UPSs.

Fig. 10

mains 1

load

rectifier-

charger

battery

inverter

static switch

mains 2

Q1

Q5N

QF1

FU1-2-3 FU5-6-7

Q3BP

Q4S

parallel

UPSs

load

static switch

mains 2

Q1

Q5N

Q3BP

Q4S

control

electronics

Q2

Q5N

Q3BP

parallel

modular UPSs

load

maintenance

bypass line

Introduction (cont.)

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