Program Settings Pgm Set; Curve Type Selection And Pickup/Time Settings - Eaton Cutler-Hammer Digitrip 1150 Instructions Manual

I.L. 70C1036H01
4.1.4.2 Alarm Events
Alarms are tracked in real time and a Reset pushbutton
may momentarily clear the alarm but the alarm will
reappear if condition is still present.
The ESCape pushbutton activation will remove the alarm
message from the display and return to normal menu
viewing mode, but the yellow alarm LED will remain lit, as
the alarm is in the system. See Appendix D-22.
Note: Another way to clear an alarm if desired, after
reviewing the alarm and its associated data, is to
enter the PGM SET Menu followed by the
ALARM submenu. The user can then revise or
turn off the associated alarm set point value.
See Appendix D-4 for possible Alarm Events.
4.1.4.3 Data resets in Meter screen
A Reset pushbutton operation will reset data values or
group of values if the Reset pushbutton is depressed
when screen value is displayed. See Appendix D-3 Meter
Menu.

4.2 Program Settings PGM SET

4.2.1 Curve Type Selection and Pickup/Time Settings

4.2.1.0 General
Before placing any circuit breaker in operation, set each
trip unit protection setting to the values specified by the
engineer responsible for the installation. Each setting is
programes using the front panel pushbuttons and save
when the desired settings are selected. A few settings are
interdependent (the LONG PU (Ir) rating will indirectly
affect the SHORT PU value). Therefore, Always verify
these settings after programming by entering View
Settings Menu.
The installed rating plug must match the current sensors
which establish the maximum continuous current rating of
the circuit breaker (In). Instantaneous and ground current
settings are defined in multiples of (In).
To illustrate the effect of each protection setting, simu-
lated time-current curves are pictured on the face of the
trip unit. Should an automatic trip occur (as a result of the
current exceeding the pre-selected value), the LED in the
appropriate segment of the simulated time-current curve
will flash red, indicating the reason for the trip.
Effective 8/18/99
Courtesy of NationalSwitchgear.com
All Digitrip 1150 and Digitrip 1150i offer the LSI(G) as the
standard factory default. The five segment straight line
curve of LONG PU and Time, SHORT PU and Time, and
INSTantaneous PU are depicted on the nameplate of the
product. The GROUND(EARTH) element is shown also
on styles with Ground Fault Protection. The LSIA style
has Ground Alarm only function. See Appendix D-12.
A second curve selection is also possible for UL/ANSI
styles. An IEEE curve that accurately follows the Inverse-
Time characteristic equations can be selected (IEEE draft
PC37.112-11/95). Curve shapes of moderately inverse,
very inverse or extremely inverse are available under
PHASE SLOPE. Each of these curve shapes have a
PICKUP and TimeDIAL selection to position the curve.
The short delay function is included as part of IEEE curve.
For the Digitrip 1150i, a second curve type is also pos-
sible for the international styles. A IEC curve type that
accurately follows the IEC255 curve equations can be
selected. The curve shapes of IEC-A (normal inverse),
IEC-B (very inverse) and IEC-C (extremely inverse) are
available under PHASE SLOPE. Each of these curve
shapes have a PICKUP and TimeDIAL selection to
position the curve. The short delay function is included as
part of IEC curve.
The available settings, for the LSIG standard curve along
with the effects of changing the settings, are described
below and in Figures 4.1 through 4.8. Sample settings are
represented in boxes (e.g. 2 )
4.2.1.1 LONG SLOPE Setting
2 4
There is a I t or I t curve shape selection possible for
LONG SLOPE.
4.2.1.2 LONG PU Setting
There are 13 available Long Delay Settings, as illustrated
in Figure 4.1. Each setting, called ( I r), is expressed as a
multiple (ranging from .4 to 1) of the current ( I n).
NOTE: ( I r) is also the basis for the Short Delay Current
Setting (see Section 4.4).
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