7.1.3 Communication bus monitoring
PARALLEL
1-[ M
]
2-
S
3- S 4- S
The second line of this menu gives a general indication regarding the communication between the
UPS units composing the system.
The numbers represent the single UPS units.
The letters M and S stand for MASTER and SLAVE respectively.
The brackets [ ] around a letter indicate that we are working on that specific UPS unit.
A question mark next to a number indicates that that UPS unit is not communicating on the
data bus.
Let us assume to have the following situation:
system composed of 4 UPS units;
UPS2 is currently the MASTER UPS;
we are checking the data communication on UPS3;
UPS4 is not communicating.
The menu will be as shown below.
PARALLEL
1- S 2-
M
3- [
S ]
4- ?
In case there are more than four paralleled devices, the menu will be as follows.
PARALLEL
1- S 2-
M
3- [
S ]
. . . .
The dots indicate the presence of a further menu which shows the status of the other UPS units in
the system.
7.1.4 Parallel type
PARALLEL
REDUNDANT+x
The string on the second line may have two values, “POWER” or “REDUNDANT+x”.
POWER means that the parallel system is so set as to require the presence of all the UPS
units to feed the load.
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