Power System; Communications Control - GE 469 Instruction Manual

469
Motor Management Relay

Power System

POWER
SYSTEM

Communications Control

SERIAL COMM.
CONTROL
5–16
The
ENABLE SINGLE VT OPERATION
"Open Delta" or "Wye".
If voltage measurements are to be made, the turns ratio of the voltage transformers
must be entered. The
VOLTAGE TRANSFORMER RATIO
secondary voltage of the VTs is between 40 and 240 V when the primary is at
. All voltage protection features that require a level setpoint are
NAMEPLATE VOLTAGE
programmed as a percent of the
MOTOR NAMEPLATE VOLTAGE
For example, given the motor nameplate voltage as 4160 V and the VTs are 4160/
120 Open Delta, set the voltage sensing setpoints as follows:
"Open Delta"
VT CONNECTION TYPE:
"34.67:1"
VT RATIO:
MOTOR NAMEPLATE VOLTAGE:
PATH: SETPOINTS S2 SYSTEM SETUP
[ ] NOMINAL SYSTEM
FREQUENCY: 60 Hz
SYSTEM PHASE
MESSAGE
SEQUENCE: ABC
SPEED2 PHASE
MESSAGE
SEQUENCE: ABC
Enter the nominal system frequency here. These setpoints allow the 469 to
determine the internal sampling rate for maximum accuracy.
The 469 may be used on variable frequency drives when the
is set to "Variable". All of the elements function in the same manner with
FREQUENCY
the following exceptions: the ratio of negative to positive-sequence current is
calculated from 0 to 30%, not 40%, and the voltage and power elements work
properly if the voltage waveform is approximately sinusoidal. An unfiltered voltage
waveform from a pulse width modulated drive cannot be measured accurately;
however, the current waveform is approximately sinusoidal and can be measured
accurately. All current elements will function properly. Note, however, that
undervoltage and underfrequency elements will not work instantaneously using
variable frequency. If "Variable" is chosen, the filtering algorithm increases the trip
and alarm times by up to 270 ms when the level is close to the threshold. If the
level exceeds the threshold by a significant amount, trip and alarm times will
decrease until they match the programmed delay. The exceptions to this increased
time are the short circuit, ground fault, and differential elements which will trip as
per specification.
If the sequence of phase rotation for a given plant is ACB rather than the standard
ABC, the
SYSTEM PHASE SEQUENCE
setpoint allows the 469 to properly calculate phase reversal, negative sequence, and
power quantities. The
SPEED2 PHASE SEQUENCE
the reversed motor rotation at Speed2 and is seen only if two-speed motor
protection is enabled.
PATH: SETPOINTS S2 SYSTEM SETUP
[ ] SERIAL COMMUNICATION
CONTROL: Off
ASSIGN START CONTROL
MESSAGE
RELAYS: Auxiliary2
If enabled, motor starting and stopping is possible via any of the three 469
communication ports. Refer to GE publication GEK-106491: 469 Communications
Guide for command formats. When a stop command is issued, the 1 TRIP relay is
activated for 1 second to complete the trip coil circuit for a breaker application or
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setpoint is seen only if the
must be chosen such that the
MOTOR NAMEPLATE VOLTAGE
represents the rated design voltage line to line.
"4160"
POWER SYSTEM
Range: 50 Hz, 60 Hz, Variable
Range: ABC, ACB
Range: ABC, ACB
setpoint may be used to accommodate this. This
can be programmed to accommodate
SERIAL COMM. CONTROL
Range: On, Off
Range: Auxiliary2,
S2 System Setup
is
VT CONNECTION TYPE
MOTOR
or rated voltage, where
NOMINAL SYSTEM
Aux2 & Aux3,
Auxiliary3
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