APC MGE 6739380EN/JC User Manual download pdf (Page 26)

Page 26 - 6739380EN/JC

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4

5

11

Frequency converters

(no Mains 2)

Shutdown of the inverters results in the

interruption of the load;

◗ shut down each inverter (see the

"shutdown of a unit" section);

◗ open battery circuit breaker QF1 and

Mains 1 input switch Q1 on each unit;

◗ the system is powered down (except

the Mains 1 cables upstream from

switch Q1). A full powering down

requires the opening of the upstream

protection device on Mains 1.

Parallel UPSs with SSC

(with Mains 2)

◗ shut down each inverter (see the

"shutdown of a unit" section);

◗ carry out the maintenance bypass

operation in the Static Switch Cubicle

(the load will be directly supplied by

Mains 2 via maintenance bypass switch

Q3BP);

◗ close switch Q3BP and open

switches Q5N and Q4S in the "static

switch" cubicle;

◗ open fuse switches Q1 and Q2 in the

Static Switch Cubicle;

◗ open battery circuit breaker QF1 in

each UPS (except for frequency

converters without a battery);

◗ open input switch Q1 for each UPS;

◗ the UPSs are powered down (except

the Mains cables upstream from

switches Q1, Q4S and Q3BP) and the

load is supplied by Mains 2.

All the lights on the control panel are

off. A full powering down requires load

shutdown and the opening of the

upstream protection devices on

Mains 1 and 2.

Buzzer reset

◗ first determine the cause of the

alarm;

◗ press the "buzzer reset" button 11

on the hidden control panel on the

concerned cubicle.

The buzzer stops, but a new alarm will

set it off again.

Multi-bypass modular UPS

◗ shutdown each UPS (see section

"shutdown of a unit");

◗ the load is supplied via the Mains 2

of each UPS;

◗ close switch Q3BP on each UPS, the

load is supplied by the Mains 2, via the

bypass lines (Q3BP) of each UPS;

◗ open switches Q5N, Q4S, Q1 and

QF1 on each UPS, the situation is that

shown in the figure opposite;

◗ the UPSs are de-energised once the

capacitors have discharged.

Q1

Q5N

QF1

Q3BP

Q4S

Q1

Q5N

QF1

Q3BP

Q4S

Modular UPS 2

Modular UPS 1

load

battery

inverter

mains 1

rectifier-

charger

static switch

battery

inverter

mains 1

rectifier-

charger

static switch

mains 2

Q1 Q5N

ON

OFF

(I)

(0)

ON

(I)

QF1

OFF

ON

(0)

(I)

Shutdown (cont.)

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