Effective 10/2004
Page 78
I.L. 70C1036H05
Appendix F Digitrip Settings and Descriptions
Digitrip 1150 Settings
Setting Description
Protection Firmware version The protection firmware version number, in hexadecimal.
Display Firmware version The display firmware version number, in hexadecimal.
Curve Type The curve type:
LSI – Long, Short, Instantaneous
LSIG – Long, Short, Instantaneous, Ground
LSIA – Long, Short, Instantaneous, Alarm on Ground only
IEEE – (IEEE Mod. Inv., Very Inv., Extremely Inv.) Short, Instantaneous
IEC – (IEC-A, -B, -C) Short, Instantaneous
Rating (In) Breaker MAX Full Load Current Continuous Rating (In) in Amperes
(PLUG RATING).
Frequency Measured system frequency of voltage.
Ground Current Sensing Residual or Source ground or Zero Sequence.
Long Delay Pickup = Ir
Rating (Ir)
Defines a current level where load current above this setting will cause an
eventual trip.
The continuous current setting of the circuit breaker.
Long Delay Slope Shape of the inverse-time-over-current (LongTIME) curve:
I
2
T
I
4
T
Long Delay Time The time delay setting in seconds before tripping @ 6xIr current level.
Short Delay Pickup
(a multiple of Ir)
Defines a current setting usually set much higher than continuous current
that will initiate timing of this function.
When the current reaches and sustains the level of the pickup setting for
the period defined by the Short Time setting, the circuit breaker trips.
Short Delay Slope Shape of the Short Time Curve.
FLAT (fixed time)
I
2
T (applicable with I
2
T Long Delay Slope only)
Short Delay Time The delay time before tripping after short delay is picked up.
Instantaneous Pickup (a multiple of In) Current above this setting will trip the circuit breaker immediately.
Ground (Earth) Fault Pickup (a multiple
of In)
Ground current above this setting will initiate a Ground trip or Ground
alarm.
Ground (Earth) Slope Shape of the Ground Curve:
FLAT (fixed time)
I
2
T
Ground (Earth) Time The delay time before tripping on Ground.
Pickup
Rating (Ir)
Defines a current level where load current above this setting will cause an
eventual trip for the IEEE or IEC curve types.
The continuous current setting of the circuit breaker.
TimeDial The TimeDial setting controls the time scale that determines the tripping
of the inverse time characteristic for an IEEE or IEC curve.
Amperes Out of Balance Trip %
Unbalance
Percent difference setting between the Max and Min phase currents which,
when exceeded, will trip the circuit breaker.
Amperes Out of Balance Trip Time The required duration of the Amperes Out of Balance Trip condition
before the circuit breaker trips.
Phase Loss Trip Time The Phase Loss Time is the duration of a phase loss condition before the
circuit breaker trips. This function will trip when a 75% difference
between Max phase and the Min phase currents exists.
External Ground Scale Factor User selectable Ground CT Ratio (when applicable).
Neutral Ratio User selectable. 50% or 100%. Select 50% for protecting ½ size neutral
conductors. (Applicable for non-ground fault units only.)
4
th
Pole Protection Neutral or 4
th
pole protection. (Applicable for non-ground fault style
units.)
Courtesy of NationalSwitchgear.com
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