APC MGE 6739380EN/JC User Manual download pdf (Page 32)

Page 32 - 6739380EN/JC

Maintenance (cont.)

Frequency converter or parallel

UPS with SSC

(figure 32)

During maintenance, the concerned

UPS or converter must be isolated from

Mains 1, its battery and the output

circuits of the other units.

◗ inverter isolation

Proceed in the following order:

◗◗ shut down the inverter (press the

"inverter off" button 7 for 3 seconds),

◗◗ open isolating switches Q5N, QF1

and Q1 for that line.

The unit is powered down once the

capacitors have discharged (a few

minutes).

In redundant systems with at least one

redundant UPS, the other UPSs (or

converters) ensure continuity of power

to the load.

Fig. 32: frequency converter exemple

Modular UPS with external

maintenance bypass

(figure 31)

To service a number of modular UPSs

with an external maintenance bypass, it

is necessary to isolate them.

◗ isolate the UPSs

Proceed in the following order:

◗◗ shut down each inverter (press the

"inverter off" button 7 for three

seconds),

◗◗ switch to the maintenance bypass

whereby the load will be directly

supplied by Mains 2 via Q3BP (close

Q3BP, then open Q5 in the

maintenance bypass cubicle),

◗◗ open input switch Q4S on each UPS;

◗◗ isolate each UPS from Mains 2 by

opening the upstream protection

devices,

◗◗ open input switch Q1 on each UPS,

◗◗ open output switch Q5N on each

UPS.

The UPSs are de-energised (except the

Mains 1 cables upstream of the Q1

switches on each UPS), but the load is

supplied with Mains 2 power via the

maintenance bypass. Complete

isolation of the installation requires

opening of the upstream protection

devices on both Mains 1 and Mains 2.

◗ start-up

Once servicing is completed, proceed

in the following order:

◗◗ close the input switches Q1 and Q4S

on each UPS,

◗◗ close output switch Q5N on each

UPS,

◗◗ close output switch Q5N in the

maintenance bypass cubicle,

◗◗ open switch Q3BP in the

maintenance bypass cubicle,

◗◗ close battery circuit breaker Q1 on

each UPS,

Fig. 31

◗◗ start all the inverters (press the

"inverter on" button 6 ).

The UPSs all come on line at the same

time if they are sufficient in number to

supply the load.

Note. It is strongly advised to call on

our after-sales support department for

these operations.

mains 1

load

mains 1

mains 1

QF1

QF1

QF1

Q1

Q1

Q1

Q5N

Q5N

Q5N

Q1

Q5N

QF1

Q3BP

Q4S

Q1

Q5N

QF1

Q4S

Modular UPS 2

Modular UPS 1

Q5N

External maintenance bypass

load

battery

inverter

mains 1

rectifier-

charger

static switch

mains 2

battery

inverter

mains 1

rectifier-

charger

static switch

mains 2

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