CHAPTER 1: GETTING STARTED
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 1–11
1.3.4 Enumeration Setpoints
The example shown in the following figures illustrates the keypress sequences required to
enter system parameters such as the phase CT primary rating, ground CT primary rating,
bus VT connection type, secondary voltage, and VT ratio.
The following values will be entered:
Phase CT primary rating: 600 A
Ground CT type: 1 A secondary
Ground CT ratio: 200:1
Neutral Voltage Transformer: None
Voltage Transformer Connection Type: Open Delta
VT Ratio: 115:1
To set the phase CT primary rating, modify the
S2 SYSTEM SETUP Z CURRENT SENSING Z
PHASE CT PRIMARY
setpoint as shown below.
Z Press the
MENU key until the relay displays the setpoints menu header.
To select the Ground CT type, modify the
S2 SYSTEM SETUP Z CURRENT SENSING ZV GROUND
CT setpoint as shown below.
Z Press the
MENU key until the relay displays the setpoints menu header.
îš„ SETPOINTS [Z]
Press MESSAGE X or ENTER
îš„ SETPOINTS [Z]
S1 489 SETUP
Press MESSAGE T
îš„
SETPOINTS [Z]
S2 SYSTEM SETUP
Press
MESSAGE X
or ENTER
îš„ CURRENT [Z]
SENSING
Press
MESSAGE X
or ENTER
PHASE CT PRIMARY:
-------------
Press the VA L U E keys until 600 A is displayed,
or enter the value directly via the numeric
keypad.
PHASE CT PRIMARY:
600 A
Press the ENTER key to store the setpoint.
NEW SETPOINT HAS
BEEN STORED
îš„ SETPOINTS [Z]
Press MESSAGE X or ENTER
îš„ SETPOINTS [Z]
S1 489 SETUP
Press MESSAGE T
îš„
SETPOINTS [Z]
S2 SYSTEM SETUP
Press
MESSAGE X
or
ENTER
îš„ CURRENT [Z]
SENSING
Press
MESSAGE X
or
ENTER
PHASE CT PRIMARY:
600 A
Press
MESSAGE T
GROUND CT:
50:0.025
Courtesy of NationalSwitchgear.com
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