Option Module/Contact Module; Filter Module; Microprocessor Module - ABB REL300 Instruction Manual

• 52a (for single-pole trip option; i.e., for pole disagreement).
• Pilot Enable - should be "ON" for the pilot system option.
• Receiver #1 (for Pilot option) - carrier receiver for two terminal application.
• Receiver #2 (for Pilot option) - second carrier receiver for three-terminal application.
• SBP (89b) for stub bus protection.

1.3.3 Option Module/Contact Module

For single-pole tripping applications, an Option module (see Appendix C) is added with extra
tripping and reed relays. The Option module plugs into the Interconnect module.
For 3-pole tripping application, an optional Contact module can be plugged into the connector
and provide 8 additional programmable output contacts.

1.3.4 Filter Module

The Filter module (see Appendix D) band-limits the seven inputs from the Interconnect module:
V , V
AN
multiplexer).

1.3.5 Microprocessor Module

The Microprocessor module (see Appendix E) includes the following subsystems:
• Microprocessor - Intel 80C196, a 16-bit microcontroller operating with a 10 MHz clock.
• EPROM - Program memory in separate, easily-replaced EPROM chips.
• PROM - Programmable read-only memory.
• RAM - Volatile read-write memory, for working storage.
• NOVRAM (EEPROM) - Non-volatile memory for storing settings and fault-data targets when
the REL300 relay is deenergized.
• A/D Converter - The seven inputs from the filter module are analog-multiplexed to a single
sample/hold circuit. The output of the sample/hold is fed to the Analog-to-Digital Converter
through an auto-ranging circuit which shifts gain by a factor of eight.
• Digital I/O Circuitry - Status inputs from breaker auxiliary contacts (52a and 52b), and Ex-
ternal Reset signal are interfaced to the microprocessor via optical isolators (Figure 4-2). The
microprocessor executes control outputs using dry contacts. Output relays (Figure 4-2) are
used for breaker tripping, breaker failure initiation (BFI), reclose initiation (RI), and reclose
blocking (RB). GS (AL-3) contact is provided for LOP/LOI alarm. Trip and relay-failure alarm
contacts are included. Reed relays in the trip circuits sense trip coil current flow and feedback
target information to the microprocessor.
For the option of Contact module, eight additional output contacts are provided and can be pro-
grammed from 30 functions shown in Table 3-4.
NOTE: JMP3 should be "OUT" for normal ABC rotation. Insert a jumper into JMP3 position for
ACB phase rotation system application.
, V , I , I , I , I . These inputs are fed to the Microprocessor module (analog signal
BN CN A B C P
I.L. 40-385.7
1-3