Wärtsilä JOVYSTAR COMPACT L
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13.4.2.3
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 56 – Parallel bus communication status
13.4.2.4
Parallel type
The string may have two values, “POWER” or “REx”.
POWER means that the parallel system is so set as to require the presence of all the UPS
units to feed the load.
REx 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, “RE2”
means that only one of the UPS units is sufficient to feed the load.
13.4.2.5
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.
