Effective 11/2003
Page 75
I.L. 66A7535H02
Digitrip 1150V 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 breaker.
Long Delay Slope
Shape of the inverse-time-over-current (LongTIME) curve: I2T
I4T
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 breaker trips.
Short Delay Slope
Shape of the Short Time Curve. FLAT (fixed time)
I2T (applicable with I2T 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 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)
I2T
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 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 breaker.
Amperes Out of Balance Trip
Time
The required duration of the Amperes Out of Balance Trip condition before the breaker
trips.
Phase Loss Trip Time
The Phase Loss Time is the duration of a phase loss condition before the 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).
Appendix F Digitrip Settings and Descriptions
