Multilin 469 Motor Management Relay ... - GE Digital Energy

CHAPTER 1: GETTING STARTED
For current transformers, make the following change in the S2 SYSTEM SETUP CURRENT
SENSING settings page:
PHASE CT PRIMARY: “400 A”
MOTOR FULL LOAD AMPS FLA: “348 A”
GROUND CT: “5 A Secondary”
GROUND CT PRIMARY: “50 A”
PHASE DIFFERENTIAL CT: “None”
ENABLE 2-SPEED MOTOR PROTECTION: “No”
For current transformers, make the following change in the S2 SYSTEM SETUP VOLTAGE
SENSING settings page:
VT CONNECTION TYPE: “Open Delta”
ENABLE SINGLE VT OPERATION: “Off”
VOLTAGE TRANSFORMER RATIO: “5 : 1”
(for a 600 V system, 600/120 V = 5, where 5 is the VT ratio)
MOTOR NAMEPLATE VOLTAGE: “575 V”
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 S2 SYSTEM SETUP POWER SYSTEM settings page to
reflect the power system:
NOMINAL SYSTEM FREQUENCY: “60 Hz”
SYSTEM PHASE SEQUENCE: “ABC”
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 S2 SYSTEM SETUP
SERIAL COMM. CONTROL page.
SERIAL COMMUNICATION CONTROL: “On”
ASSIGN START CONTROL RELAYS: “Auxiliary2”
The Auxiliary 2 relay will be used to start the motor. Note that this auxiliary relay can not be
used for any other application.
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 1–31