TP1-1021
Quick Start
2-3
As noted before, the protection settings for this function block, pickup, time dial, and curve, must be set
separately in the setting group settings. The setting might be S0-51N=6.5,2.1,S1R,F for Setting in group
0 - the 51N function = pickup at 6.5 amps with a time dial of 2.1 using curve S1 with an integrating Reset
characteristic and set for Forward directional detection.
The 51N function block has two logic output variables, 51NT (Trip) and 51NPU (Picked Up). The
combination of the logic settings and the operational settings for the function block govern how these
variables respond to logic and current inputs.
Output Logic Settings
BESTlogic, as implemented in the BE1-951, supports up to 16 output expressions. The output expressions
are called virtual outputs to distinguish them from the physical output relays. VOA and VO1 through VO5
drive physical outputs OUTA (failsafe alarm output), and OUT1 through OUT5 respectively. The rest of the
virtual outputs can be used for intermediate logic expressions.
For example, OUT 1 is wired to the trip bus of the circuit breaker. To set up the logic to trip the breaker, the
BESTlogic setting command might be SL-VO1=VO11+101T+BFPU for Set Logic - Virtual Output 1 = to
Virtual Output 11 (which is the intermediate logic expression for all of the function block tripping outputs) or
(+) 101T (the trip output of the virtual breaker control switch) or (+) BFPU (the pickup output of the breaker
failure function block that indicates that breaker failure has been initiated).
USER INTERFACES
Two user interfaces are provided for interacting with the BE1-951 relay: one is the front panel HMI, and the
other is ASCII communications. The front panel HMI provides access to a subset of the total functionality
of the device. ASCII communications provides access to all settings, controls, reports, and metering
functions of the system.
Front Panel HMI
The front panel HMI consists of a two line by 16 character LCD (liquid crystal display) with four scrolling
pushbuttons, an edit pushbutton, and a reset pushbutton. The edit pushbutton includes an LED to indicate
when edit mode is active. There are five other LEDs for indicating power supply status, relay trouble alarm
status, programmable major and minor alarm status, and a multipurpose trip LED that flashes to indicate that
a protective element is picked up. The trip LED lights continuously when the trip output is energized, and
seals in when a protective trip has occurred to indicate that target information is being displayed on the LCD.
A complete description of the HMI is included in Section 10,
Human-Machine Interface.
The BE1-951 HMI is menu driven and organized into a menu tree structure with six branches. A complete
menu tree description with displays is also provided in Section 4,
Protection and Control. A list of the menu
branches and a brief description for scrolling through the menu is in the following paragraphs.
1.
REPORT STATUS. Display and resetting of general status information such as targets, alarms, recloser
status.
2.
CONTROL. Operation of manual controls such as virtual switches, selection of active setting group, etc.
3.
METERING. Display of real-time metering values.
4.
REPORTS. Display and resetting of report information such as time and date, demand registers,
breaker duty statistics, etc.
5.
PROTECTION. Display and setting of protective function setting parameters such as logic scheme,
pickups, time delays, etc.
6.
GENERAL SETTINGS. Display and setting of non-protective function setting parameters such as
communication, LCD contrast, and CT ratios.
Each screen is assigned a number in the HMI section. The number indicates the branch and level in the
menu tree structure. Screen numbering helps you to keep track of where you are when you leave the menu
tree top level. You view each branch of the menu tree by using the right and left scrolling pushbuttons. To
go to a level of greater detail, you use the down scrolling pushbutton. Each time a lower level in a menu
branch is reached, the screen number changes to reflect the lower level. The following paragraphs and
Figure 2-2 illustrate how the display screens are numbered in the menu tree.
