Multilin 469 Motor Management Relay ... - GE Digital Energy

CHAPTER 1: GETTING STARTED
1.4.6 S5 Thermal Model
GENERAL SWITCH A ALARM DELAY: “5.0 s”
GENERAL SWITCH A EVENTS: “On” so this event is registered.
GENERAL SWITCH A TRIP: “Off”
If the relay will not be used to trip the motor when someone gains unauthorized access to
the station, the next settings should be left at their default values:
GENERAL SWITCH A TRIP: “Off”
ASSIGN TRIP RELAYS: “Trip”
GENERAL SWITCH A TRIM DELAY: “5.0 s”
The S5 Thermal Model settings page contains settings for entering settings related to
protection of the motor during the starting process as well as during normal operation.
As per the information provided above, the settings for the Thermal Model are entered as
follows in the
SELECT CURVE STYLE: “Standard”
OVERLOAD PICKUP: “1.25 x FLA”
ASSIGN TRIP RELAYS: “Trip”
UNBALANCE BIAS K FACTOR: “6”
COOL TIME CONSTANT RUNNING: “15 min.”
COOL TIME CONSTANT STOPPED: “30 min.”
HOT/COLD SAFE STALL RATIO: “0.89”
ENABLE RTD BIASING: “Yes”
RTD BIAS MINIMUM: “40°C” – ambient temperature
RTD BIAS CENTER POINT: “130°C” – center value
RTD BIAS MAXIMUM: “155°C” – maximum value
THERMAL CAPACITY ALARM: “Unlatched” – recommended for early warning to take
corrective actions and prevent the interruption of the process.
ASSIGN ALARM RELAYS: “Alarm” – the Alarm contact could be use for local indication,
or to send a local signal to reduce load, before a trip is issued.
THERMAL CAP. ALARM LEVEL: “80%”
THERMAL CAPACITY ALARM EVENT: “Yes” – captures event in the event report.
As well, select the overload curve for the Thermal model with the following settings in the
S5 THERMAL MODEL OVERLOAD CURVE SETUP menu:
STANDARD OVERLOAD CURVE NUMBER: “7”
1.4.7 S6 Current Elements
The S6 Current Elements settings page contains settings for entering protection element
characteristics. In our example, these characteristics are specified under Motor Protection
heading.
From this data and the resulting calculations, program the S6 settings page as indicated.
When setting the relay for the first time, other settings not listed in this example should be
left disabled.
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 1–33