System Status (Communication Bus Monitoring); Parallel Type; Message Statistics - LEGRAND VR61-18 Manuel De L'utilisateur

5.4.2.3 System status (communication bus monitoring)

This field 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 section will be as shown below.
Picture 32 – Parallel bus communication status

5.4.2.4 Parallel type

The string 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.
➢ REDUNDANT+x means that the system is redundant and the redundancy index is
indicated by number "X". For example, in a system composed of 3 UPS units,
"REDUNDANT+2" means that only one of the UPS units is sufficient to feed the load.

5.4.2.5 Message statistics

The statistics section regarding the messages exchanged on the communication buses
consists of three different parts.
STAT CAN SSW  Number of messages received and percentage of reception accuracy
regarding the status of the static switches. The messages are exchanged between all the
UPS units, therefore the number will increase on all of them.
STAT CAN INV MSG0  Number of messages received and percentage of reception
accuracy regarding the synchronism signals. The messages are sent by the MASTER UPS,
therefore the number will only increase on the SLAVE UPS units.
STAT CAN INVERTER  Number of messages received and percentage of reception
accuracy regarding the status of the system. The messages are exchanged between all the
UPS units, therefore the number will increase on all of them.
42 OMP06145 REV. D
UPS user manual
Manuel de l'utilisateur de l'ASI
Utilizzo dell'UPS