1–2
M-0420 Instruction Book
1.2
Before You Begin
The Beckwith Electric M-0420 Multifunction Re-
lay is a sophisticated relay applicable to a wide
variety of applications. While it has been careful-
ly designed to be easy to install and configure, if
you're a first-time user, we suggest that you ac-
quaint yourself with its operation in the following
manner:
•
Read this Introduction for a general over-
view of the relay.
•
Read Chapter 2, Application, for informa-
tion on using the relay to protect genera-
tors and to initiate appropriate breaker
commands in response to faults and abnor-
mal conditions.
•
Refer to Chapters 3, Front Panel Controls
and 4, Operation, to familiarize yourself with
the layout and operation of the front-panel
controls.
•
Refer to Chapter 5, Menu Reference, for
detailed information on the functions you will
be using in your application.
•
Read Chapter 6, Installation, for mounting
dimensions, external connections, initial set-
up, and verification routines.
•
Refer to Appendix E, Configuration Record
Forms for forms on which to record your
relay configuration and DIP switch settings.
•
Refer to publication M-0429A BECOCOM
®
/
M-0428A BECOPLOT
®
User’s Guide for
information on configuring and interrogating
the relay via a personal computer running
the optional BECOCOM communications
software package, and for information on
plotting downloaded fault data via the optional
BECOPLOT software package.
The M-0420 Multifunction Relay Instruction Book
has been organized to address the needs of dif-
ferent parts of your organization. If you are re-
sponsible for verifying that the relay conforms to
specifications as received, please turn to Chap-
ter 6, Installation for initial setup, and to Chap-
ter 7, Test Procedures.
If you are responsible for the operation of the
relay in a specific application, please turn to Chap-
ter 2, Application, for information on enabling
specific functions and entering setpoints. If you
are responsible for the mechanical and electrical
installation of the relay, please refer to Chapter
6, Installation.
If you are interested in a description of the re-
lay's capabilities, please read this Introduction
thoroughly, and refer to Appendix A, Theory of
Operation, for more detailed information.
Please don't hesitate to call your local sales
representative or Beckwith's application engineers
(727-544-2326) for assistance in resolving any
problems.
1.3
Configuration As Shipped
You can become familiar with the basic opera-
tion of the relay before it is installed by connect-
ing it to the appropriate power input and setting
it up on a bench or desktop. Even without any
test voltages connected, you will be able to step
through the various menus and note the indica-
tions on the liquid crystal display (LCD) and the
various light-emitting diodes (LEDs). The formal
initial setup information is presented in Chapter
6, Installation, which includes Figure 6-5 show-
ing the external connections.
As shipped, the relay is in the following configu-
ration:
•
the clock has been disabled
•
the second setpoints on various functions
have been disabled, and do not appear on
the display
•
the DIP switch (at bottom of inside case)
has been set as below; setting is also de-
tailed on the yellow or pink tag attached to
the equipment. (The yellow tag is for 60 Hz;
the pink tag is for 50 Hz.)
1
)
n
o
i
t
c
e
l
e
s
r
e
s
u
r
o
f
t
o
n
(
F
F
O
2
)
n
o
i
t
a
r
b
i
l
a
c
n
a
h
t
r
e
h
t
a
r
,
n
o
i
t
a
r
e
p
o
l
a
m
r
o
n
(
N
O
3
)
e
d
o
m
c
i
t
s
o
n
g
a
i
d
n
a
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t
r
e
h
t
a
r
,
n
o
i
t
a
r
e
p
o
l
a
m
r
o
n
(
N
O
4
)
e
s
a
h
p
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n
a
n
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d
e
s
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t
n
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r
r
u
c
/
r
e
w
o
p
e
s
r
e
v
e
r
(
N
O
5
)
e
n
i
l
-
o
t
-
e
n
i
l
r
o
f
t
e
s
s
t
u
p
n
i
T
V
(
N
O
6
)
c
a
V
0
2
1
s
i
e
g
a
t
l
o
v
y
r
a
d
n
o
c
e
s
T
V
(
F
F
O
7
)
g
a
t
w
o
l
l
e
y
-
z
H
0
6
s
i
y
c
n
e
u
q
e
r
f
m
e
t
s
y
s
(
F
F
O
)
g
a
t
k
n
i
p
-
Z
H
0
5
s
i
y
c
n
e
u
q
e
r
f
m
e
t
s
y
s
(
N
O
8
)
y
l
n
o
t
n
e
n
o
p
m
o
c
l
a
t
n
e
m
a
d
n
u
f
y
b
,
S
M
R
(
F
F
O
Содержание M-0420
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