Siemens MJ-XL, Инструкция по установке и эксплуатации

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5
Reading and Interpreting MJ-XL Control Panel Data
36 Siemens Power Transmission & Distribution, Inc.
To access log data, view the <
EVENT LOG
> Menu with
the Menu Selection keys; then use the Ù and Ú keys to
sequence through the log entries.
New Events that occur while Events are displayed are
saved, but not made available for viewing until you return
to the Menu level and subsequently scroll into the
< EVENT LOG > Menu again. Meter data for all of the
Events can be retrieved via the display screen on the front
panel. Data for the 200 most recent Events is stored and
can also be retrieved via the front-panel Data Port or the
Communication Port.
5.5.1 Viewing Event Data
To quickly go from viewing one Event to viewing the previ-
ous or next Event, use the × or Ø keys. For example, if
the screen being viewed is [Event: 20], press the × key
once to view the [Event: 19] screen. From the [Event: 19]
screen, press the Ø key once to view the [Event: 20]
screen again.
5.5.2 Clearing Individual Events from the Event
Log
Since you can now view all of the < EVENT LOG > data
from the front panel, or download it via the data port, it is
unnecessary to delete individual < EVENT LOG > items.
The MJ-X
L
no longer supports deleting individual log
records. If the < EVENT LOG > memory is full, the oldest
record is overwritten when a new event occurs.
5.6 Interval Log — the <INTERVAL
LOG> Menu
The MJ-X
L
Control Panel can be set up to record data at
the completion of a predefined interval of time. Use the
< LOG SETUP > Menu to define the time interval and to
activate Interval logging. (See Section 4.5).
Interval logging occurs when “seconds” is zero on the
internal clock. For certain interval period selections, inter-
val logging is tied to the time-of-day. For 15 and 30 minute
interval settings, the MJ-X
L
logs data at even quarter and
half-hour increments, respectively. For a one-hour setting,
the MJ-X
L
logs data on the hour. For four and six-hour set-
tings, the MJ-X
L
logs data synchronized to 12:00:00 mid-
night.
Table 5.6 describes the data that is logged at the conclu-
sion of each interval.
If the specified interval elapses while you are viewing
< INTERVAL LOG > data, the MJ-X
L
saves the new data,
but it is not available for viewing until you return to the
Menu level and subsequently scroll into the < INTERVAL
LOG > Menu again. Data for all of the Intervals can be
viewed from the < INTERVAL LOG > Menu. Data for the
800 most recent Intervals is stored and can also be
retrieved through the front-panel Data Port or the Commu-
nication Port.
5.6.1 Viewing Interval Data
To quickly go from viewing one Interval to viewing the pre-
vious or next Interval, use the
×
or
Ø
keys. For example, if
the screen being viewed is [Interval: 20], press the
×
key
once to view the [Interval: 19] screen. From the [Interval:
19] screen, press the
Ø
key once to view the [Interval: 20]
screen again.
5.6.2 Clearing Individual Intervals from the
Interval Log
Since you can now view all of the < INTERVAL LOG > data
from the front panel, or download it via the data port, it is
unnecessary to delete individual < INTERVAL LOG >
items. The MJ-X
L
no longer supports deleting individual
log records. If the < INTERVAL LOG > memory is full, the
oldest record is overwritten when a new interval log
occurs.
5.6.3 Resetting Min/Max Values at Each
Interval
In < LOG SETUP >, set ResLogMinMax to ON to reset
min/max values at the start of each interval. With this fea-
ture enabled, MJ-X
L
logs the min/max values that occur
during each interval.
Table 5.6
Interval Log Data Items
INTERV: Interval number
1
DATE: Interval date
TIME: Interval time
Vld Secondary
2
Load voltage — rms, Max, Min, Dmd
Vsrc Source voltage — rms
Ild Load current — rms, Max, Min, Dmd
PF Power Factor — Present, PFKVA max, PFKVA min
KWld Real power — Present, Max, Min, Demand
KVAld Apparent power — Present, Max, Min, Demand
Tap = Tap position
Tapmax = Maximum tap position
Tapmin = Minimum tap position
Total ops = Total tap changes
1. The Interval number is a sequential number used for main-
taining and referencing the interval log.
2. Secondary only — even if PRI selected in Meter Volts data
item.