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

CHAPTER 5: SETTINGS
5.3 S2 System Setup
Note
Note
5.3.1 Current Sensing
PATH: SETTINGS S2 SYSTEM SETUP CURRENT SENSING
CURRENT [
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
PHASE CT PRIMARY:
Not Programmed
MOTOR FULL LOAD
AMPS
GROUND CT:
50:0.025
GROUND CT PRI-
MARY:
PHASE DIFFEREN-
TIAL
PHASE DIFFEREN-
TIAL
ENABLE 2-SPEED
MOTOR
SPEED2 PHASE CT
PRIMARY: 100 A
SPEED2 MOTOR
FLA: 1 A
Range: 1 to 5000 A in steps of 1. Values
≥5001 denote not
Range: 1 to 5000 A in steps of 1. Values
≥5001 denote not
Range: None, 1A Secondary, 5A
Secondary, 50:0.025
Range: 1 to 5000 A in steps of 1
Range: None, 1A Secondary, 5A
Secondary
Range: 1 to 5000 in steps of 1
Range: No, Yes
Range: 1 to 5000 A in steps of 1
Range: 1 to 5000 A in steps of 1
The GROUND CT PRIMARY and PHASE DIFFERENTIAL CT PRIMARY settings are seen only if
the GROUND CT is set to “1A Secondary” or “5A Secondary”.
The SPEED2 PHASE CT PRIMARY and SPEED2 MOTOR FLA settings are seen only if two-speed
motor protection is enabled.
As a safeguard, PHASE CT PRIMARY and MOTOR FULL LOAD AMPS are defaulted to “Not
Programmed” when shipped. A block start indicates the 469 was never programmed. Once
PHASE CT PRIMARY and MOTOR FULL LOAD AMPS are entered, the alarm resets itself. The
phase CT should be chosen so the FLA is no less than 50% of the rated phase CT primary.
Ideally, the phase CT primary should be chosen so the FLA is 100% of the phase CT primary
or slightly less, never more. The secondary value of 1 or 5 A must be specified at the time of
order so that the proper hardware is installed. A value for MOTOR FULL LOAD AMPS (FLA)
must also be entered. The value may be taken from the motor nameplate data sheets. The
service factor may be entered as overload pickup (see S5 Thermal Model on page 5–36).
For high resistance grounded systems, sensitive ground current detection is possible if the
50:0.025 ground CT input is used. To use the 50:0.025 input, select “50:0.025” for the
GROUND CT settings. No additional ground CT messages will appear. On solidly grounded
systems where fault currents may be quite large, the 469 1A or 5A secondary ground CT
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–17