Ge 489 User Manual download pdf (Page 64)

4-14 489 Generator Management Relay GE Multilin

4.4 S3 DIGITAL INPUTS 4 SETPOINTS

4.4S3 DIGITAL INPUTS 4.4.1 DESCRIPTION

The 489 has nine (9) digital inputs for use with external contacts. Two of the 489 digital inputs have been pre-assigned as

inputs having a specific function. The Access Switch does not have any setpoint messages associated with it. The Breaker

Status input, may be configured for either an 'a' or 'b' auxiliary contact. The remaining seven digital inputs are assignable;

that is to say, each input may be assigned to any of a number of different functions. Some of those functions are very spe-

cific, others may be programmed to adapt to user requirements.

Terminals C1 and C2 must be shorted to allow changing of any setpoint values from the front panel keypad. This

safeguard is in addition to the setpoint passcode feature, which functions independently (see the

S1 489 SETUP Ö

PASSCODE menu). The access switch has no effect on setpoint programming from the RS232 and RS485 serial

communications ports.

4.4.2 BREAKER STATUS

PATH: SETPOINTS ÖØ S3 DIGITAL INPUTS ÖØ BREAKER STATUS

This input is necessary for all installations. The 489 determines when the generator is online or offline based on the

Breaker Status input. Once 'Breaker Auxiliary a' is chosen, terminals C3 and C4 will be monitored to detect the state of the

machine main breaker, open signifying the breaker is open and shorted signifying the breaker is closed. Once "Breaker

Auxiliary b" is chosen, terminals C3 and C4 will be monitored to detect the state of the breaker, shorted signifying the

breaker is open and open signifying the breaker is closed.

 BREAKER STATUS

 [ENTER] for more

BREAKER STATUS:

Breaker Auxiliary b

Range: Breaker Auxiliary a,

Breaker Auxiliary b

WARNING

ENTER

ESCAPE

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Ge 489 User Manual Page 64