GE 469 User Manual

5–38 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
5.6.2 Thermal Model
PATH: SETTINGS ZV S5 THERMAL MODEL Z 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 Z MOTOR STATUS ZV MOTOR THERMAL CAPACITY USED actual value register.
If the motor has been stopped for a long period of time, it will be at ambient temperature

THERMAL [
SELECT CURVE
STYLE:
Range: Standard, Custom, Voltage
Dependent
MESSAGE
OVERLOAD PICKUP
LEVEL: 1.01 x FLA
Range: 1.01 to 1.25 in steps of 0.01
MESSAGE
ASSIGN TRIP
RELAYS:
Range: Trip, Trip & Aux2, Trip & Aux2 &
Aux3, Trip & Aux3
MESSAGE
UNBALANCE BIAS
K FACTOR: 0
Range: 0 to 19 in steps of 1. (0 defeats
this feature)
MESSAGE
COOL TIME CON-
STANT
Range: 1 to 1000 min. in steps of 1
MESSAGE
COOL TIME CON-
STANT
Range: 1 to 1000 min. in steps of 1
MESSAGE
HOT/COLD SAFE
STALL RATIO: 1.00
Range: 0.01 to 1.00 in steps of 0.01
MESSAGE
ENABLE RTD
BIASING: No
Range: Yes, No
MESSAGE
RTD BIAS
MINIMUM: 40°C
Range: 0°C to RTD BIAS CENTER value
in steps of 1
MESSAGE
RTD BIAS CENTER
POINT: 130°C
Range: RTD BIAS MINIMUM value to
RTD BIAS MAXMIMUM value
in steps of 1
MESSAGE
RTD BIAS
MAXIMUM: 155°C
Range: RTD BIAS CENTER value to
250°C in steps of 1
MESSAGE
THERMAL CAPACITY
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM
RELAYS:
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
MESSAGE
THERMAL CAP.
ALARM
Range: 10 to 100% in steps of 1
MESSAGE
THERMAL CAPACITY
ALARM EVENTS: Off
Range: On, Off

GE 469 Specifications

General

Model	GE 469
Category	Relays
Frequency	50/60 Hz
Protection Functions	Overcurrent
Communication Protocols	Modbus, DNP3, IEC 61850
Display	LCD
Mounting	Panel