GE 469

CHAPTER 2: INTRODUCTION
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 2–9
Timing accuracy: ...........................................<100 ms or ±0.5% of total time
Elements:............................................................Trip and Alarm
GROUND INSTANTANEOUS OVERCURRENT
Pickup level: ......................................................0.1 to 1.0 × CT primary in steps of 0.01
Time delay:........................................................0 to 1000 ms in steps of 10
Pickup accuracy: ...........................................as per ground current input
Timing accuracy: ...........................................+50 ms
Elements:............................................................Trip and Alarm
JOGGING BLOCK
Starts/hour: 1 to 5 in steps of 1
Time between starts: 0 to 500 min.
Timing accuracy: ±0.5 s or ± 0.5% of total time
Elements: Block
MECHANICAL JAM
Pickup level: ......................................................1.01 to 3.00 × FLA in steps of 0.01 of any one phase,
blocked on start
Time delay:........................................................1 to 30 s in steps of 1
Pickup accuracy: ...........................................as per phase current inputs
Timing accuracy: ...........................................±0.5 s
Elements:............................................................Trip
OVERLOAD / STALL PROTECTION / THERMAL MODEL
Overload curves: ...........................................15 standard overload curves, custom curve, voltage
dependent custom curve for high inertia starting (all
curves time out against average phase current)
Biasing:................................................................Phase unbalance
Hot/cold curve ratio
Stator RTD
Running cool rate
Stopped cool Rate
Line voltage
Overload pickup: ...........................................1.01 to 1.25 (for service factor)
Pickup accuracy: ...........................................as per phase current Inputs
Timing accuracy: ...........................................±100 ms or ±2% of total time
Elements:............................................................Trip and Alarm
OVERVOLTAGE
Pickup level: ......................................................1.01 to 1.10 × rated in steps of 0.01 of any one phase
Time delay:........................................................0.1 to 60.0 s in steps of 0.1
Pickup accuracy: ...........................................as per voltage inputs
Timing accuracy: ...........................................±100 ms or ±0.5% of total time
Elements:............................................................Trip and Alarm
PHASE DIFFERENTIAL INSTANTANEOUS OVERCURRENT
Pickup level: ......................................................0.05 to 1.0 × CT primary in steps of 0.01 of any one phase
Time delay:........................................................0 to 1000 ms in steps of 10
Pickup accuracy: ...........................................as per phase differential current inputs
Timing accuracy: ...........................................+50 ms
Elements:............................................................Trip
PHASE SHORT CIRCUIT
Pickup level: ......................................................2.0 to 20.0 × CT primary in steps of 0.1 of any one phase
Time delay:........................................................0 to 1000 ms in steps of 10
Pickup accuracy: ...........................................as per phase current inputs