9328900990 Rev L BE1-951 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 S
etting 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 F
orward 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 S
et Logic - Virtual Output 1 =
to V
irtual 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 10, Human-Machine Interface. 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,
and 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.
Viewing the 47 pickup and time delay settings of Setting Group 2 involves the following steps:
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