APC MGE 6739380EN/JC User Manual download pdf (Page 27)

6739380EN/JC - Page 27

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7

Alarms

The autodiagnostic system considers

any system status other than normal as

a problem.

Prior to any other action, note any

lights (A to

N) on the hidden control

panel that may be on.

Also note any messages on the screen.

Certain problems may result in the

control panel not functioning.

In this case, it is strongly

recommended to call the after-sales

support department.

◗ if the load is still correctly supplied

with power, it has probably been

transferred to Mains 2 (static switch)

and is therefore no longer protected;

◗ if the load is no longer supplied with

power, transfer it manually to the

maintenance bypass (see section

below).

Maintenance bypass

Note:

◗ in systems with a Static Switch

Cubicle, the above operation is carried

out in the Static Switch Cubicle;

◗ the operation with the three switches

is carried out in reverse order (3, 2, 1)

to return to normal status;

◗ in an installation comprising modular

UPSs with an external maintenance

bypass, the operation is carried out in

the external maintenance bypass. The

cubicle is not equipped with a Q4S

switch and it is therefore necessary to

open the protection devices upstream

on the maintenance-bypass line.

This operation is possible only if the

system includes a Mains 2. It results in

the load being directly supplied by

Mains 2 via maintenance bypass switch

Q3BP, thus ensuring a higher level of

security in the event of a malfunction.

Important:

Prior to beginning the bypass

operation, shut down all system

inverters (press the "inverter off" button

7 on each UPS control panel). If an

inverter remains operating and the

Mains 2 transfer conditions are not

correct, the load will suffer a 0.8 second

interruption.

Switching procedures are explained on

a drawing next to each switch. It is

imperative that the operation proceed in

the following order:

◗ shut down any inverters that may

still be running;

◗ 1 : close maintenance bypass switch

Q3BP;

◗ 2 : open inverter output switch Q5N;

◗ 3 : open Mains 2 input switch Q4S:

Q1 Q4S Q3BP Q5N

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2

3

bypass

OFF

ON

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ON

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ON

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OFF

ON

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ON

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ON

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ON

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ON

OFF

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ON

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ON

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OFF

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