Firmware Menu; Harmonic Menu; Eventlog; Power And Energy Parameters - Eaton Cutler-Hammer Digitrip 1150 Instructions Manual

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4.3.1 Firmware Menu

The Firmware menu enables the user to view the version
and revision of the trip unit firmware. The protection
firmware is displayed as PROTECT while the display
firmware can be viewed by pressing the up/down View
function keys.
4.4 Meter Menu
The METER menu initially will show 6 screens of data via
the factory display setup. They are phase current, neutral
and ground currents (if supplied), phase voltages, forward
power, power factor and frequency, and energy values.
However, the program DISPLAY menu can be used to
present metered data relevant to a specific customer
application. There are 22 data screens selectable as
listed in Appendix D-14 and D-3.
The Demand and the average, minimum and maximum
current screens alternate between the data and additional
information concerning the measured parameter. The min
and max phase currents are actually reset as a group.
See Appendix D-3. The OP COUNT screen displays
breaker operation where a open/close is registered as
one count. The OP COUNT can be reset also when this
screen is active.

4.5 Harmonic Menu

The Digitrip 1150 HARMONIC Menu provides capabilities
to calculate and display the Total Harmonic Distortion
(THD) for phase currents IA, IB and IC as well as IN if
available. The term THD is used to define the amount of
harmonic current that the breaker is seeing or the system
is experiencing in percentage of the power frequency
current. This can be useful in troubleshooting to detect
individual breaker current loads that could lead to system
problems and early equipment failure. The equation used
for calculating THD is:
Where Irms is the rms current of the waveform and I1 is
the rms current of the fundamental frequency.
For example, the THD calculation for a load having an
equal rms value of the fundamental and third harmonic
current would have a THD value of 100 percent. This
would be a large value of THD and would not be typical.
In addition to individually displaying the THD for the phase
currents, the Digitrip 1150 will also display the individual
harmonic currents up through the 27th harmonic.
Courtesy of NationalSwitchgear.com
Local operation on the Digitrip to observe this data is
done using the View Down pushbutton on the front panel
of the Digitrip.
By selecting "HARMONIC" from the Main Menu, a
waveform capture event and harmonic data calculation is
accomplished locally. A second way is to automatically
generate waveform capture on a 1 minute, 5 minute, 10
minute, or OFF basis by selecting "GENERAL" in the
Program Settings submenu and scrolling to the "WAVE-
FORM CAPTURE" option. The third way is to remotely
trigger the waveform capture via a POWERNET commu-
nication command. POWERNET software screens are
available to show waveform capture oscillographs of each
phase as well as bar graphs of the magnitudes and
individual harmonics that make up the three-phase
currents. See Section 4.9.
If less than 15% of the rated current is applied to the
breaker, the trip unit will display three dashed lines('- - -')
for the THD and Crest Factor values since these cannot
accurately be measured.
4.6 Event Log
The Digitrip 1150 trip unit has the ability to record the
cause, timestamp and associated current, voltage or
related data for a maximum of three events. An event is
defined as an alarm or trip condition experienced by the
breaker. The user has the option to record only trip
function events or to record both trip and alarm functions
by manipulating the Alarm to EventLOG setpoint located
in the Alarms programming menu. The event data is
stored in nonvolatile RAM and is maintained on a first-in,
first-out basis. In the case where the Alarm to EventLOG
setting is enabled, a new alarm event will replace either
an historic trip or historic alarm condition stored previ-
ously.

4.7 Power and Energy Parameters

Power has approximately a 1 second update rate and is
shown as Forward or Reverse Power in kW units. The
parameters kVA and kvar are also updated in a similar
time period. Demand kW is presented as Forward or
Reverse in kW units and is based on the last average - 5
minute interval. Demand kVA is also based on the last
average - 5 minute interval. These parameters can be
reset when this screen is in view and the Reset
pushbutton action will start a new 5 minute period.
Programming Alarms (kW or kVA) to exceed a threshold
value will produce an Alarm. A time stamp is also pro-
vided if the Alarm to EventLOG setting is enabled.
I.L. 70C1036H01
Effective 8/18/99