GE M60 Instruction Manual page 210

5.4 SYSTEM SETUP

PATH: SETTINGS SYSTEM SETUP
 MOTOR

5
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
NOTE
• 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
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
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
setting is used as a reference for the voltage dependant thermal overload curve feature and indicates
PLATE VOLTAGE
a 100% voltage starting condition.
5-72

MOTOR
MOTOR FULL LOAD AMPS
(FLA): 1.000 pu
MOTOR OVERLOAD
MESSAGE
FACTOR: 1.00
MOTOR NAMEPLATE
MESSAGE
VOLTAGE: 600 V
MOTOR OFFLINE:
MESSAGE
Off
EMERGENCY RESTART:
MESSAGE
Off
MOTOR LINE SOURCE:
MESSAGE
SRC 1
NUMBER OF STARTS
MESSAGE
TO LEARN: 5
MOTOR LOAD AVERAGE
MESSAGE
CALC. PERIOD: 15 min.
2-SPEED MOTOR
MESSAGE
PROTECTION: Disabled
SPEED2 MOTOR SWITCH:
MESSAGE
Off
SPEED2 SWITCH 2-1
MESSAGE
DELAY: 5.00 s
SPEED2 MOTOR SOURCE:
MESSAGE
SRC 1
SPEED2 MOTOR FLA:
MESSAGE
1.000 pu
SETTINGS
MOTOR OVERLOAD FACTOR
M60 Motor Protection System
Range: 0.050 to 1.000 pu in steps of 0.001
Range: 1.00 to 1.50 in steps of 0.01
Range: 100 to 50000 V in steps of 1
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 1 to 5 in steps of 1
Range: 1 to 90 minutes in steps of 1
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: 0.00 to 600.00 s in steps of 0.01
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.050 to 1.000 pu in steps of 0.001
 
TRANSDUCER I/O RTD INPUTS
threshold, the M60 thermal model reacts by accu-
MOTOR OVERLOAD FACTOR
5 SETTINGS
5.4.4 MOTOR
menu.
should be set to 1.1
MOTOR NAME-
GE Multilin