9282300990 Rev L
BE1-87B Introduction
iii
PRODUCT REVISIONS
The following information provides a historical summary of the changes made to the hardware and
instruction manual of the BE1-87B Bus Differential Relay. All revisions are listed in chronological order.
Hardware Version
Change
⎯
Initial release.
A
Enhanced temperature stability and SWC immunity in single-phase relays.
B
New circuit board design released for single-phase relays.
C
Applied Revision A enhancements to three-phase relays with new circuit board design.
D
Improved immunity to ESD.
E
CT Test pushbutton changed to “pillow-type” switch. Optional case cover with CT Test
pushbutton access introduced.
F
Improved relay stability during cycling of operating power.
G
Corrected labeling for CR1 and CR3 polarity on the SCR circuit board.
H
Not released to production.
I
Revision designator I not used.
J
Improved stability of Relay Trouble output contacts during power-up/power-down.
Manual Version
Change
⎯
Initial release.
A
Corrected various errors in the illustrations.
B
Added and updated drawings throughout the manual to accommodate the three-phase
version of the BE1-87B.
C
Section 1:
Added UL recognition to specifications. Changed voltage rating specification
from “75% of tap setting” to “300 Vac for 1 hour”.
Section 2:
Corrected equation reference under
Sample Calculation
.
Section 4:
Revised Figures 4-1 and 4-2 to show proper position of the Reset button
access on the S1 case.
Changed all power supply status references from “Relay Trouble Alarm” to “Power
Supply Status”.
D
Updated drawings, as required, to reflect changes to the cases and overlays as a result
of “pillow-type” switch implementation for CT Test pushbutton.
Updated the style chart with front cover with CT test access option.
E
Corrected the terminal numbering in Figure 2-5.
Changed the Power Supply Status Contacts label to Relay Trouble Contacts in Figures
4-13 and 4-14.
Corrected various minor errors throughout the manual.
F
Information was added to Section 2,
Application
.
Moved CT circuit testing information from Section 3,
Human-Machine Interface
to
Section 5,
Testing
.
Moved illustration of Figure 3-3 to Section 4,
Installation
and added terminal
designations.
Added metric equivalents and mounting depth dimension to Figure 3-4 and moved
illustration to Section 4,
Installation
.
Corrected various minor errors throughout manual.
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