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5.
Connect the UPSs in a ring configuration via the two 15-pin parallel communication terminals on
each UPS. Use the supplied cables. See Figure 24, Figure 28, Figure 30, Figure 33, and Table 7.
Figure 37: Parallel communication cable with 15-pin connectors
6.
Verify that each UPS's output circuit breaker is in the OFF position (CB5 in the connection
diagrams - Figure 40, Figure 41, Figure 42).
7.
Turn on one of the systems. This system will become the "master" system. Wait until the startup
procedure is complete – you will see the main menu screen. It should read "UPS ON, Normal mode",
and there should be no alarms present. (If there are active alarms, resolve any problems before
continuing.)
8.
Put the UPS in multisystem mode:
Main menu > Setup > System > Multisystem mode.
(In the event that this option is blocked, consult your distributor or sales agent to obtain the needed
password.)
9.
Now turn on the other parallel system or systems. These will be the "slave" systems.
You can have up to four systems in a parallel configuration. Once the master system has completed
the start-up process (step 6 above), the remaining systems (slave systems) can be switched on
together. Wait until they finish start-up and verify that each system is in "Normal" mode and has no
active alarms.
10. Put the slave systems in multisystem mode (Main menu > Setup > System > Multisystem mode).
11. For each slave system, compare the output voltage of each phase to that of the master system.
Any voltage difference should be no greater than 2 Vac.
If the difference in output voltage is greater than 2 V for any phase, navigate to the "Main Menu >
Status" screen, tap the "Modules" icon, and then tap the "output" button at the bottom of the page.
You will see the ac output voltage display, per module. By tapping on each of the module icons on the
left side of the screen you can see which modules have an output voltage that is more than ±2 V
different from the master system.
Centric Installation Guide, rel. 2.8
G
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AMATRONIC
LECTRONIC
Figure 38: The main menu screen
L
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NDUSTRIES
TD
41
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