GE Multilin 469

QUICK REFERENCE GUIDE SYSTEM DATA
469 MOTOR MANAGEMENT RELAY – QUICK REFERENCE GUIDE 57
12.14 Motor Starting Setpoints
The S7 Motor Starting setpoints page contains additional setpoints used to complement
the Thermal Model. In our example, these characteristics are specified under Motor
Protection heading.
For the Acceleration Timer element, enter the following values in the
S7 MOTOR STARTING Z
ACCELERATION TIMER page. Press the MESSAGE T key after each setpoint is completed to
move to the next message.
ACCELERATION TIMER TRIP: “Latched”
ASSIGN TRIP RELAYS: “Trip”
ACCELERATION TIMER FROM START: “13 s” – as shown in the acceleration curves at
100% voltage
For the Start Inhibit element, enter the following values in the
S7 MOTOR STARTING ZV
START INHIBIT
page. Press the MESSAGE T key after each setpoint is completed to move
to the next message.
START INHIBIT BLOCK: “On”
TC USED MARGIN: “25%”
With these settings, the 469 relay prevents motor starting if there is insufficient thermal
capacity for a successful motor start.
There is not information available to set Starts/Hour, Time Between Starts, or the Restart
Block features. Therefore, the following setpoints must be disabled:
JOGGING BLOCK: “Off”
RESTART BLOCK: “Off”
12.15 RTD Temperature Setpoints
The S8 RTD Temperature page contains the setpoints for the twelve (12) field
programmable RTDs that are normally used for temperature monitoring. The temperature
measured by each RTD can be compared to pickup values, and set to energize Trip or
Alarm outputs.
For proper temperature monitoring, enter the RTD types in the
S8 RTD TEMPERTURE Z RTD
TYPES page. Press the MESSAGE T key after each setpoint is completed to move to the
next message.
STATOR RTD TYPE: “100 Ohm Platinum”
BEARING RTD TYPE: “100 Ohm Platinum”
AMBIENT RTD TYPE: “100 Ohm Platinum”
OTHER RTD TYPE: “100 Ohm Platinum” – default value
As per the information provided above, there will be six RTDs, two per phase located in the
Stator, and two Bearing RTDs, one to monitor the ambient temperature.
For Stator Overtemperature protection, enter the following setpoints in the
S8 RTD
TEMPERTURE
ZV RTD 1 to RTD6 menus:
RTD #1 APPLICATION: “Stator”
RTD #1 NAME: “ST Ph A1”
RTD #1 ALARM: “Unlatched”
ASSIGN ALARM RELAYS: “Alarm”