GE Multilin M60 Motor Protection System 5-101
5 SETTINGS 5.4 SYSTEM SETUP
5
5.4.4 MOTOR
PATH: SETTINGS SYSTEM SETUP MOTOR
These settings reflect the design and configuration of the motor that the relay will protect. Note that some protection ele-
ments are dependent on these settings for correct operation.
Prior to revision 5.40, RTDs used for motor stator thermal model were defined in this section. With revisions 5.40
and higher, RTDs are defined in the
SETTINGS TRANSDUCER I/O RTD INPUTS menu.
• MOTOR FULL LOAD AMPS: This setting represents the full load current (FLA) of the motor as a fraction of the CT pri-
mary rating. FLA is a standard motor parameter that can be found on the motor nameplate.
• MOTOR OVERLOAD FACTOR: This setting defines the current level at which the motor is considered to be over-
loaded. If the motor current exceeds the MOTOR OVERLOAD FACTOR threshold, the M60 thermal model reacts by accu-
mulating thermal capacity. Normally, this factor is set slightly above the motor service factor to account for inherent
load measuring errors (CTs and limited relay accuracy). The typical total inaccuracy factor is 8 to 10%; as such, for
motors with a thermal capability at rated service factor of 1 or 1.15, the
MOTOR OVERLOAD FACTOR should be set to 1.1
or 1.25, respectively.
If the average load current is between full load and the overload factor, the thermal capacity remains constant. If the
average current is less than the full load current, the thermal capacity decays exponentially.
• MOTOR NAMEPLATE VOLTAGE: This setting represents the rated phase-to-phase motor voltage. The MOTOR NAME-
PLATE VOLTAGE
setting is used as a reference for the voltage dependant thermal overload curve feature and indicates
a 100% voltage starting condition.
MOTOR
MOTOR FULL LOAD AMPS
(FLA): 1.000 pu
Range: 0.050 to 1.000 pu in steps of 0.001
MESSAGE
MOTOR OVERLOAD
FACTOR: 1.00
Range: 1.00 to 1.50 in steps of 0.01
MESSAGE
MOTOR NAMEPLATE
VOLTAGE: 600 V
Range: 100 to 50000 V in steps of 1
MESSAGE
MOTOR OFFLINE:
Off
Range: FlexLogic operand
MESSAGE
EMERGENCY RESTART:
Off
Range: FlexLogic operand
MESSAGE
MOTOR LINE SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
NUMBER OF STARTS
TO LEARN: 5
Range: 1 to 5 in steps of 1
MESSAGE
MOTOR LOAD AVERAGE
CALC. PERIOD: 15 min.
Range: 1 to 90 minutes in steps of 1
MESSAGE
2-SPEED MOTOR
PROTECTION: Disabled
Range: Disabled, Enabled
MESSAGE
SPEED2 MOTOR SWITCH:
Off
Range: FlexLogic operand
MESSAGE
SPEED2 SWITCH 2-1
DELAY: 5.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
SPEED2 MOTOR SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
SPEED2 MOTOR FLA:
1.000 pu
Range: 0.050 to 1.000 pu in steps of 0.001
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