IB 6.1.2.8-1B
Page 4
ABB
1. FUNCTIONS.
The electronic trip control device provides the following four basic functions:
1.1
Protection Function
Four basic trip elements within the unit perform the protective functions:
Long time, short time, instantaneous and ground.
1.2
Information Function
An indicator (target) and an LCD screen display information for the tripping functions
.
The indicator shows if
the device has issued a trip command and the LCD can be polled to determine the type of trip. The LCD and
keypad buttons are used to determine the settings of the unit. A red LED indicates self-monitoring functions.
1.3
Test Functions
The unit can be connected to an external test set to check functions and settings.
1.4
Communication Functions
The unit can be connected to switchgear mounted devices which are connected to ABB INCOM Protocol.
2. SETTINGS.
2.1
Range Selection
The range selector provides the primary amperage used as the base for the unit. It is either set for the 1 X or
0.5 X the breaker rating: Default is 1 X.
2.2
Long Time Function
2.2.1 Threshold (pickup)settings- The range of settings is: 0.5 to 1.0 in steps of 0.1. Multipliers are used in
conjunction with sensor rating and the range selector. Multipliers are selected by keypad input and displayed on
the LCD. Default is 1.0.
2.2.2 Trip Time - Time is defined by long time overcurrent curves (graph) and intermediate values between band
limits. Default is MAX.
2.2.3 Reset Time - Real time is counted up if the current exceeds the function threshold and counted down if the
current drops below the function threshold. Real time is set to zero if the current drops below the power supply
threshold.
2.3.
Short Time Function
2.3.1 Threshold (pickup) settings - 2 3 4 5 6 7 8 9 10 DISABLED. The settings are multiples of the sensor ratings
and the range selector. Settings are made by the keypad and the LCD display. If the INST function is disabled, the
short time unit cannot be disabled. Default is DISABLED.
