S3 Digital Inputs; Description; Access Switch; Breaker Status - GE 489 Instruction Manual

4.4 S3 DIGITAL INPUTS

4.4 S3 DIGITAL INPUTS
The 489 has nine 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
The access switch has no effect on setpoint programming from the RS232 and RS485 serial communications ports.
T

BREAKER STATUS

T
[ENTER] for more
4
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.
4-10
ð
BREAKER STATUS:
ENTER
Breaker Auxiliary b
ESCAPE
489 Generator Management Relay
4 SETPOINT PROGRAMMING

4.4.1 DESCRIPTION

4.4.2 ACCESS SWITCH

489
S1 SETUP / PASSCODE
4.4.3 BREAKER STATUS
Range: Breaker Auxiliary a,
Breaker Auxiliary b
GE Power Management
menu).