I.L. 40-385.1B
(5/92)
4-5
• JMP5
set to “IN” for output con-
tact tests.
• JMP6
normally set to “OUT” po-
sition; set to “IN” when
making A/D converter cal-
ibration.
NOTE: Should the customer need to gain ac-
cess to any of the jumpers (above), see
Section 4.10, and Appendix E.
4.7
COMMUNICATION INTERFACE
Two options are available for interfacing between
MDAR and a variety of local and remote communi-
cation devices.
• RS-232C - for single point computer communica-
tion
• INCOM
®
/PONI
1
- for local network communica-
tion
An IBM
®
AT
®
or XT compatible computer, with soft-
ware provided (WRELCOM), can be used to monitor
the settings, 16 fault data, 16 intermediate data, and
metering information. For a remote setting, SETR
should be set to “YES”; then the settings can be
changed (remotely) with a user-defined password. If
a user loses his assigned password, a new pass-
word can be installed by turning the MDAR relay’s dc
power supply “OFF” and then “ON”. MDAR allows a
change of password within the next 15 minutes, by
using a default “PASSWORD”.
When in the remote mode, the computer can disable
the local setting by showing SET = REM (in the Me-
tering mode). Then, the setting cannot be changed
locally. In this situation, the only way to change a set-
ting locally would be to turn the dc power “OFF” and
then “ON”. The computer will allow for a local setting
change within 15 minutes.
4.8
SIXTEEN FAULT TARGET DATA
The MDAR saves the latest 16 fault records, but only
the latest two fault records can be accessed from the
front panel. For complete 16 fault data, one of the
1.
INCOM”
®
is a registered trademark of
the Westinghouse Electric Corporation,
Inc., which stands for INtegrated
COMmunications. The “PONI” acronym
stands for Product Operated Network
Interface.
communication interface devices are necessary.
The activation of fault data storage is controlled by
setting FDAT. (Refer to Section 3.4.19 for detailed
information.) The 16 intermediate fault targets are a
standard feature. The activation of data storage is
based on the setting of the optional OSC (see next
section). If OSC is not included, intermediate data is
provided one sample per cycle.
4.9
OSCILLOGRAPHIC DATA
(Optional Feature)
Sixteen sets of oscillographic data are stored in
MDAR. Each set includes seven analog traces (Va,
Vb, Vc, Ia, Ib, Ic and In), with one cycle pre-fault and
7-cycle fault information, and 20 sets of digital data
based on 8 samples per cycle.
The oscillographic data (OSC) collection can be set
for TRIP, Z2TR, Z2/Z3, and dVdI. For setting of OSC
= TRIP, data are collected for the trip events. The
data collection is started from dVdI if the trip occurs
within 7 cycles. For OSC = Z2TR, the data collection
is triggered by Zone 2 pickup or any types of trip. For
OSC = Z2/Z3, the collection is triggered by either
Zone 2 or Zone 3 pickup (including the Zone 3 re-
verse setting) or trip. For OSC = dVdI, the data col-
lection is caused by any line disturbance, e.g., a sud-
den phase current change (by 1 amp) or a ground
current change (by 0.5 Amp), or a voltage change
(
∆
V) greater than 7Vdc.
NOTE: Setting at dVdI is not recommended be-
cause a lot of meaningless data will be
stored, such as breaker opening or clos-
ing, etc.
4.10 ROUTINE VISUAL INSPECTION
With the exception of Routine Visual Inspection, the
MDAR relay assembly should be maintenance-free
for one year. A program of Routine Visual Inspection
should include:
• Condition of cabinet or other housing
• Tightness of mounting hardware and fuses
• Proper seating of plug-in relays and sub-
assemblies
• Condition of external wiring
• Appearance of printed circuit boards and compo-
nents
• Signs of overheating in equipment
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Page 135: ...I L 40 385 1B SD 6 5 92 Figure SD 2 MDAR Block Diagram sheet 1 of 1 Sub 1 1611C12...