Thermal Model - GE 469 Instruction Manual

S5 Thermal Model

Thermal Model

THERMAL
MODEL
GE Multilin
PATH: SETPOINTS S5 THERMAL MODEL
[ ] SELECT CURVE STYLE:
Standard
OVERLOAD PICKUP
MESSAGE
LEVEL: 1.01 x FLA
ASSIGN TRIP RELAYS:
MESSAGE
Trip
UNBALANCE BIAS
MESSAGE
K FACTOR: 0
COOL TIME CONSTANT
MESSAGE
RUNNING: 15 min.
COOL TIME CONSTANT
MESSAGE
STOPPED: 30 min.
HOT/COLD SAFE
MESSAGE
STALL RATIO: 1.00
ENABLE RTD
MESSAGE
BIASING: No
RTD BIAS
MESSAGE
MINIMUM: 40°C
RTD BIAS CENTER
MESSAGE
POINT: 130°C
RTD BIAS
MESSAGE
MAXIMUM: 155°C
THERMAL CAPACITY
MESSAGE
ALARM: Off
ASSIGN ALARM RELAYS:
MESSAGE
Alarm
THERMAL CAP. ALARM
MESSAGE
LEVEL: 75% USED
THERMAL CAPACITY
MESSAGE
ALARM EVENTS: Off
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
value register. If the motor has been stopped for a long period of time, it will be at
ambient temperature and the
motor is in overload, once the thermal capacity used reaches 100%, a trip will occur.
The
THERMAL CAPACITY ALARM
overload trip.
http://www.GEindustrial.com/multilin
THERMAL MODEL
Range: Standard,
Range: 1.01 to 1.25 in steps of 0.01
Range: Trip, Trip & Aux2, Trip & Aux2
Range: 0 to 19 in steps of 1. (0 defeats
Range: 1 to 1000 min. in steps of 1
Range: 1 to 1000 min. in steps of 1
Range: 0.01 to 1.00 in steps of 0.01
Range: Yes, No
Range: 0°C to
Range:
Range:
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Range: 10 to 100% in steps of 1
Range: On, Off
MOTOR STATUS MOTOR THERMAL CAPACITY USED
MOTOR THERMAL CAPACITY USED
may be used as a warning indication of an impending
469
Motor Management Relay
Custom, Voltage
Dependent
& Aux3, Trip & Aux3
this feature)
RTD BIAS CENTER value
in steps of 1
RTD BIAS MINIMUM
value to
RTD BIAS MAXMIMUM value
in steps of 1
RTD BIAS CENTER
value to
250°C in steps of 1
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
actual
should be zero. If the
5–31