GE 469 Instruction Manual page 39

CHAPTER 1: GETTING STARTED
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
For current transformers, make the following change in the
settings page:
SENSING
"400 A"
PHASE CT PRIMARY:
MOTOR FULL LOAD AMPS FLA
: "5 A Secondary"
GROUND CT
: "50 A"
GROUND CT PRIMARY
PHASE DIFFERENTIAL CT
ENABLE 2-SPEED MOTOR PROTECTION
For current transformers, make the following change in the
settings page:
SENSING
: "Open Delta"
VT CONNECTION TYPE
ENABLE SINGLE VT OPERATION
VOLTAGE TRANSFORMER RATIO
(for a 600 V system, 600/120 V = 5, where 5 is the VT ratio)
MOTOR NAMEPLATE VOLTAGE
The 469 Motor Management Relay was designed with the ability to display primary system
values. Current and voltage measurements are performed at secondary levels, which the
relay transforms to primary values using CT and VT ratios, system voltage, as well as the
nominal secondary values.
In the case of the phase CTs, configuring the relay for current measurements is simple and
it only requires inputting the CT primary current. Phase CT inputs can be 1 A or 5 A, and
they must be specified when the relay is purchased.
There is more flexibility with regards to Ground CT inputs, as well as VT inputs, where
nominal values are not required ahead of time, before the relay is ordered; therefore more
settings are needed to set the relay for measurements.
Make the following change in the
reflect the power system:
NOMINAL SYSTEM FREQUENCY:
SYSTEM PHASE SEQUENCE
The example calls for remote control via serial communications, received from the master
station, through the RTU. Motor starting and stopping is possible via any of the three 469
communication ports.
When a start command is issued, the auxiliary relay assigned for starting control is
activated for 1 second to complete the close coil circuit for a breaker application, or
complete the start control circuit for a contactor application. A contactor sealing contact
would be used to maintain the circuit. For details on issuing a start or stop command via
communications, refer to the GE Publication GEK-106491: 469 Communications Guide.
Make the following changes to the communications settings in the
page.
SERIAL COMM. CONTROL
SERIAL COMMUNICATION CONTROL
ASSIGN START CONTROL RELAYS
The Auxiliary 2 relay will be used to start the motor. Note that this auxiliary relay can not be
used for any other application.
: "348 A"
: "None"
: "No"
: "Off"
: "5 : 1"
: "575 V"
S2 SYSTEM SETUP
"60 Hz"
: "ABC"
: "On"
: "Auxiliary2"
S2 SYSTEM SETUP CURRENT
S2 SYSTEM SETUP VOLTAGE
settings page to
POWER SYSTEM
S2 SYSTEM SETUP
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