BECKWITH ELECTRIC M-3520, Instruction Book

Page: 32 / 217

1–3
Introduction – 1
With the optional M-3931 Human-Machine Interface
Module (HMI), all functions can be set or examined
via a local, menu-driven 2-line by 24-character
display. The HMI also provides the capability for
local metering of various quantities, including
phase, neutral, and sequence voltages and
currents; power factor, real, reactive, and apparent
power measurements, 32 most recent events.
Also included are self-test, self-calibration and
diagnostic capabilities.
The function outputs can provide tripping and/or
alarm contacts. Light Emitting Diodes (LEDs) are
used for the targets to provide visual indication of a
function operation. Three serial I/O ports provide
remote communication capability.
A switching mode power supply provides the relay
with the various power supply voltages required
for operation. (A redundant power supply is
available as an option.)
The serial interface ports, COM1 and COM2, are
standard 9-pin RS-232 DTE-configured
communications ports. The front-panel port, COM1,
is used to locally set and interrogate the M-3520 via
a portable computer. The second RS-232 port, COM2,
is provided at the rear of the unit. An isolated
RS-485 communication port, COM3, is also available
at the relay’s rear terminal block. The standard
configuration of the RS-485 port is 2-wire, 4-wire
must be specified at the time of purchase. Either
rear-panel port, COM2 or COM3, can be used to
remotely set and interrogate the M-3520 via a modem,
network or direct serial connection. Detailed
information on the use of the relay communications
ports is provided in Appendix B, Communications,
as well as Chapter 4,
Operation (Computer) .
The unit provides up to 170 cycles of waveform data
storage assignable to up to 4 events with selectable
post-trigger delay. Once downloaded, the data can
be analyzed using the optional M-3801D IPSplot
®
PLUS Oscillograph Analysis Software package.
2 3 4 5 6 7 8 9 10 27 26 30 29 28 31 32 33 34
1 2 3 4 5 6 7 8
46 47 48 49 50 51 52 53
+ -
G
I
C
I
B
I
A
I
G C
V
B
V
A
V
6 19 0 118 t h AVE NO.
WARNING! CONTACT WITH TERMINALS MAY CAUSE ELECTRICAL SHOCK
V V V
F1 F2
F3 F4
PS2 PS1
RATED CURRENT
SELF- TEST P/ S
4 3 2 1 6 5
INPUTS ALARMS
( 5 2 b)
CONTACT RATINGS SEE INSTRUCTION MANUAL
COM 2
BECKWITH ELECTRIC CO. INC.
RTN
RS2 3 2 IRIG- B
+ -
PS2 PS1
3 A MP,2 5 0 V ( 3 A B)
5 A ,NOM 1A ,NOM
LA RGO, FL 3 3 773 727 - 5 4 4 - 2 3 2 6
RX 4 W
RS4 8 5
COM 3
T X
2 W
V V2
L R 8 9 4 6 4
NRT L/ C
LIST ED
IND.CONT .EQ
54
IN IN IN IN IN IN
- + - +
12 13 14 15 16 17 18 19 20 23 22 21 25 24
IN
BC AB
RATED VOLTAGE ( NOMINAL )
6 0 - 14 0 V A C,5 0 / 6 0 Hz
36 43
CA
35 63 59
R
8 3 F4
R
11
18 - 5 6 VDC
8 5 - 2 6 0 VDC
/ VAC
18 - 5 6 VDC
8 5 - 2 6 0 VDC
/ VAC
45 39 38 37 40 41 42 44 55 56 57 58 60 61 62
OUTPUTS
1
Figure 1-1 M-3520 Front and Rear Panels