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Centric 3x480 Vac, Installation Guide, rel. 2.2
44
6.1
Safety considerations
There are general principles of safety that apply to the insertion and removal of power modules. These
principles also reduce the chances of unplanned electrical disturbance to the loads.
1
.
The ideal situation is where the
Centric
can be turned off before performing the insertion or removal
of a power module.
2
.
Where it is very inconvenient to turn off the
Centric
, the next best procedure is to turn off all loads or
disconnect them from the
Centric
while the insertion or removal of the module is in process.
3
Where it is not possible to disconnect or turn off the loads, the next best procedure is to
perform the
insertion or removal of a module with the system in bypass mode.
4
.
If none of the above situations can be obtained, the insertion or removal of modules can still be
accomplished safely.
5.
If you remove a UPS module or a dc-to-dc converter module from the Centric when the module is
operating, do not re-insert the module immediately. Wait five minutes, to allow the capacitors in the
module time to discharge.
6.
Never attach or detach flat cables to/from a UPS module unless the module is completely “OFF” (the
two LEDs on the front of the module are “OFF”). Pull the module out about 10 cm (3 inches) to
unseat the module’s connections before attaching or detaching the flat cables.
6.2
Insertion of power modules at system installation
You can perform the initial system start-up with the UPS modules in place, or you can bring up the system
first and then add the UPS modules.
6.2.1
Start-up with UPS modules already in place
If you started up the Centric with the UPS modules already in place in their shelves and with each module’s
communication cables attached, the UPS modules start up automatically. It takes a few minutes for each
module to start up. (You can follow the process by selecting “Status > Modules > DC” and watching as
each module’s “Precharge” percentage increase from 0 to 100 %).
Wait until all the modules that should be “ON” are marked with a checkmark in the “Status > Modules”
screen, then skip to section
6.2.3 “Verify proper module output”.
6.2.2
Startup with no modules in place
If you install the modules after UPS startup, the following procedure applies.
1.
Verify that the system controller is in place and is operating (“CPU Active” LED to the left of the LCD
is lit green). You cannot add or swap modules without the system controller.
2.
Verify that there are sufficient dc-dc blocks installed for the number of UPS modules you intend to
install. Figure 39 shows the location of the dc-dc blocks.
If you need to install an additional dc-dc module or modules, do so now. The dc-dc module shelves
may be covered by a protective blank plate. For each dc-dc shelf that you intend to use, remove the
protective plate by removing the two screws that hold it in place. Slide the dc-dc module(s) all the way
into the shelf.
3.
Now install the UPS modules into the UPS module shelves, in any order, as follows:
(One or more of the UPS module shelves may be covered by a protective blank plate. For each UPS
module shelf that you intend to use, remove the protective plate by removing the two screws that hold
it in place.)
For each UPS module:
3.1
The UPS modules are relatively heavy – about 20 kg (44 lbs) – and may be difficult for one person
to handle safely. Have two persons lift the module and slide it most of the way into the shelf. One
person shall stand on each side of the shelf (Figure 38).
3.2
Slide the module most of the way into the module shelf, but NOT ALL THE WAY IN
. Leave at
least 10 cm (3 inches) exposed, so that the module remains disconnected from the power.
