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469 Motor Management Relay
GE Power Management
4.6 S5 THERMAL MODEL
4 SETPOINT PROGRAMMING
4
4.6.2 469 THERMAL MODEL
The primary protective function of the 469 is the thermal model. It consists of five key elements: the overload
curve and overload pickup level, the unbalance biasing of the motor current while the motor is running, the
motor cooling time constants, and the biasing of the thermal model based on Hot/Cold motor information and
measured stator temperature. Each of these elements are described in detail in the sections that follow.
The 469 integrates stator and rotor heating into one model. Motor heating is reflected in the
A1 STATUS\MOTOR
STATUS\THERMAL CAPACITY USED
actual value register. If the motor has been stopped for a long period of time, it
will be at ambient temperature and the
THERMAL CAPACITY USED
should be zero. If the motor is in overload,
once the thermal capacity used reaches 100%, a trip will occur. The
THERMAL CAPACITY ALARM
may be used as
a warning indication of an impending overload trip.
y
THERMAL MODEL
y
[ENTER] for more
SELECT CURVE STYLE:
Standard
Range: Standard, Custom, Voltage Dependent
OVERLOAD PICKUP
LEVEL: 1.01 x FLA
Range: 1.01 to 1.25, step: 0.01
ASSIGN TRIP RELAYS:
Trip
Range: Trip, Trip & Aux2, Trip & Aux2 & Aux3, Trip & Aux3
UNBALANCE BIAS
K FACTOR: 0
Range: 0 to 19, step 1 (0 defeats this feature)
COOL TIME CONSTANT
RUNNING: 15 min.
Range: 1 to 1000 min., step: 1
COOL TIME CONSTANT
STOPPED: 30 min.
Range: 1 to 1000 min., step: 1
HOT/COLD SAFE
STALL RATIO: 1.00
Range: 0.01 to 1.00, step: 0.01
ENABLE RTD
BIASING: No
Range: Yes, No
RTD BIAS
MINIMUM: 40°C
Range: 0 to RTD BIAS CENTER, step: 1
RTD BIAS CENTER
POINT: 130°C
Range: RTD BIAS MINIMUM to RTD BIAS MAXMIMUM, step: 1
RTD BIAS
MAXIMUM: 155°C
Range: RTD BIAS CENTER to 250°C
Step: 1
THERMAL CAPACITY
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM RELAYS:
Alarm
Range:
Alarm, Alarm & Auxiliary2, Alarm & Aux2 & Aux3, Alarm
& Auxiliary3, Auxiliary2, Aux2 & Aux3, Auxiliary3
THERMAL CAP. ALARM
LEVEL: 75% USED
Range: 10 to 100%
Step: 1
THERMAL CAPACITY
ALARM EVENTS: Off
Range: On, Off
ENTER
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