Salicru UPS SLC TWIN PRO series User Manual Download Page 25

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SALICRU

6.5. How to replace a faulty UPS from

the operating parallel system.

Press over the key in any UPS for more than 3 sec-

onds to shutdown all the inverters. The acoustic alarm

will beep for 3 seconds. The equipments that belong to

the current parallel system will transfer to "Bypass mode".

Put all the equipments on manual bypass. To do it re-

move the cover from manual bypass switch, which is

located at the back of each equipment and turn all the

switches to position "BYPASS".

Keep in mind that on "Bypass mode" or with the

switch on "BYPASS" position, the loads will be ex-

posed to fluctuations of voltage, frequency and mains faults

or blackouts, so in case it were possible, choose one day

with the lowest probability of faults (days without fluctua-

tions, days without storms,... ) and do it as fast as possible.

Turn the input and bypass circuit breaker protections

(TWIN/3 PRO > 10 kVA) of the distribution panel corre-

sponding to the equipment to replace to "Off".

Disconnect the communication bus of the faulty equip-

ment and all power connections too, and remove it.

Put the manual bypass switch of the new UPS, on "BY-

PASS" position. To do it remove the protection cover from

manual bypass switch, which is located at the back of the

equipment to connect.

Place the new equipment instead of the faulty one and

reconnect it. Attend the stated instructions in section

5.3.7.2, for parallel connection.

In parallel installations, the “Jumper” (cable as

bridge mode) connected from factory between the

terminals JP1 and JP2 must be removed.

• Turn "On" the circuit breakers switches corresponding to the

new UPS:

The input one from distribution panel and the one in the

UPS.

In those equipments with static bypass line (TWIN/3

PRO > 10 kVA), also the bypass one of the protection

panel and the one in the UPS.

UPSs supply output voltage from bypass. Check the screen

of the LCD from control panel in case there were any warning

or error information.
Measure the output voltage between the terminals JP1 of the

parallel system and terminals JP1 of the new UPS, to check

the voltage difference is under 1 V. In case the difference

were higher than 1 V, double check the wiring and associ-

ated instructions.

• Put back the cover of the manual bypass of each UPS.
• Press over the start up key for more than 1 second in any

of the UPSs and all of them will start up. All UPSs will transfer

to "Normal mode”.
Measure the output voltage between the terminals of the

parallel system and the output terminals of the new UPS, to

check the voltage difference is under 0,5 V. In case the differ-

ence were higher than 1 V, the UPSs have to be set (contact

with the S.T.S.).

• Press over the shutdown key in any UPS for more than 3

seconds and each one will be shutdown, supplying output

voltage through the bypass.
Turn “On” the output circuit breaker switch of the distribution

panel, corresponding to the new integrated equipment. The

complete parallel system will supply output voltage, through

the bypass.

• Remove the cover of the manual bypass in each UPS.
• Transfer the equipments with the manual bypass ("BYPASS"

position) to position "UPS". Do it in the switches of all equip-

ments.

• Put back the protection cover of the manual bypass switch

of all equipments, also check the torque of the fixing screws,

otherwise any of the limit contacts could be activated and the

manual bypass too.

• Press over the start up key for more than 1 second in any

of the UPSs and all of them will start up, finally the parallel

system will be working on "Normal mode”.
Load/s are protected by the parallel system again.

6.6. Manual Bypass Switch

(maintenance).

6.6.1. Operating principle.

Integrated manual bypass in all UPS from SLC TWIN PRO
is very useful, but a wrong use can cause irreversible conse-
quences for both the UPS and connected loads at its output.
Therefore, it is important to respect the manoeuvring over the
switch as it is stated in the following sections.

6.6.2. Transference to maintenance

bypass.

• The procedure to transfer from normal mode to maintenance

bypass is the same for a single equipment or a parallel

system, less the quantity of actions:

For a single equipment.

–

Press over the key of the UPS for more than 3 sec-

onds to shutdown the inverter. The acoustic alarm will

beep for 3 seconds. The equipment will transfer to

"Bypass mode".

For a parallel system.