ABB MDAR Instruction Manual page 15

3.6 MICROPROCESSOR MODULE
The MDAR (REL-300) microprocessor module con-
trols the MDAR (REL-300) system. It contains the
A/D conversion circuitry, the I/O circuitry and the
following components:
One microcontroller (U100) — The Intel 80C196KB
microcontroller is a 16-bit CMOS processor operates
at 10 MHz frequency with two 16-bit timer/counters, a
high-Speed I/O subsystem, 230 bytes of on-chip
RAM, a watchdog timer, a serial port and numerous
I/O lines.
EPROMs (U103 and U104) —
ily-replaceable EPROM chips are for program mem-
ory.
PAL (U105) — For programmable Array Logic.
RAMs (U200 AND U201) — Two volatile read-write
memory chips are for working storage.
NOVRAM (U202) — One non-volatile RAM is for the
storage of settings, targets and data when the relay
is deenergized.
A battery back-up real-time clock (U501) supplies
time and date information for time stamping target
data. The real-time clock can be set through the front
panel operator interface or using the RS-232C port or
the INCOM communication.
Relay
K1 Trip B
K2 Trip B
K3 K1 Breaker current monitor
K4 K2 Breaker current monitor
K5 Trip C
K6 Trip C
K7 K5 Breaker current monitor
K8 K6 Breaker current monitor
K9 Breaker failure initiate
K10 Breaker failure initiate
Two separate, eas-
Function
3.7 OPERATOR INTERFACE (OR DISPLAY)
MODULE
An illustration of the display module appears in Fig-
ure 4. It includes function and value display fields.
Each is a 4-character, 14 segment, blue color vac-
uum fluorescent, alphanumeric display, 0.7 inch high.
A software display saver is built-in. The MDAR (REL-
300) display will be on only 5 minutes after turning in
the DC power supply, or depressing any one of the
front panel pushbutton or detecting any fault on the
line. LED's show display modes. Pushbutton
switches, (no external equipment is required), are
used to change modes, read target or operation data,
call metering displays and enter settings.
A detailed description of the operator interface is
included in Chapter VII.
3.8 OPTIONAL SINGLE-POLE TRIP MODULES
The optional module is required for single-pole trip-
ping application. It plugs to the interconnect module,
and is steadied by a center support bar.
The circuitry associated with the tripping of phases B
and C is located on this module and is identical to the
phase A trip circuit located on the power supply mod-
ule. The functions of the ten relays on the optional
module are shown in chart below:
3.9 COMMUNICATION ATTACHMENTS
(Refer To Chapter 11 For Detail)
Type Contacts
Telephone SPDT
Telephone SPDT
Reed Form A
Reed Form A
Telephone SPDT
Telephone SPDT
Reed Form A
Reed Form A
Telephone DPDT
Telephone DPDT
I.L. 40-385.5
Rating
10 A
10 A
0.5 A
0.5 A
10 A
10 A
0.5 A
0.5 A
5 A
5 A
3-3