Motor - GE M60 Instruction Manual

SYSTEM SETUP

5.5.4 Motor

SETTINGS  SYSTEM SETUP  MOTOR
 MOTOR

5
These settings reflect the design and configuration of the motor that the relay protects. Some protection elements depend
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
MOTOR FULL LOAD AMPS
rating. FLA is a standard motor parameter that can be found on the motor nameplate.
MOTOR OVERLOAD FACTOR
motor current exceeds the
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, set the
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
the voltage dependant thermal overload curve feature and indicates a 100% voltage starting condition.
— This input must be connected to the appropriate external contact. This setting is selected to a contact
MOTOR OFFLINE
input that is connected to an auxiliary contact of the breaker or contactor used to switch the motor. The motor is declared
to be stopped when the phase current falls below 2% of motor full load current (FLA) and the external contact indicates the
switching device is open.
5-146
MOTOR FULL LOAD AMPS

(FLA): 1.000 pu
MOTOR OVERLOAD

FACTOR: 1.00
MOTOR NAMEPLATE

VOLTAGE: 600 V
MOTOR OFFLINE:

Off
EMERGENCY RESTART:

Off
MOTOR LINE SOURCE:

SRC 1
NUMBER OF STARTS

TO LEARN: 5
MOTOR LOAD AVERAGE

CALC. PERIOD: 15 min.
2-SPEED MOTOR

PROTECTION: Disabled
SPEED2 MOTOR SWITCH:

Off
SPEED2 SWITCH 2-1

DELAY: 5.00 s
SPEED2 MOTOR SOURCE:

SRC 1
SPEED2 MOTOR FLA:

1.000 pu
SETTINGS  TRANSDUCER I/O  RTD INPUTS
— This setting represents the full load current (FLA) of the motor as a fraction of the CT primary
— This setting defines the current level at which the motor is considered to be overloaded. If the
MOTOR OVERLOAD FACTOR
— This setting represents the rated phase-to-phase motor voltage. It is used as a reference for
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
menu.
threshold, the M60 thermal model reacts by accumulating thermal
to 1.1 or 1.25, respectively.
MOTOR OVERLOAD FACTOR
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS