GE MI-869 - Page 20

1–10 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
Standard Overload Curve, Cutoff
Effect:.................................................................
Standard Overload Curve, Shift
Effect:.................................................................
Motor Rated Voltage:........................................1 to 50000 V in steps of 1
Thermal Model Biasing: ................................... Current Unbalance, RTDs
Thermal Model Update Rate:........................1 power cycle
Stopped/Running Cool Time Constants: . 1 to 1000 min. in steps of 1
Stopped/Running Cool Time Constant
Decay:.................................................................Exponential
Hot/Cold Safe Stall Ratio:................................0.01 to 1.00 in steps of 0.01
Current Accuracy:...............................................Per phase current inputs
Current Source:....................................................True RMS
Timer Accuracy: .................................................. ±100 ms or ±2%, whichever is greater
Timer Accuracy for Voltage Dependent
Overload:...........................................................±100 ms or ±4%, whichever is greater
CURRENT UNBALANCE (46)
Unbalance: ............................................................Unbal = (I
2
/ I
1
) x A
factor
x 100%
A
factor
= (I
avg
/ FLA) if l
avg
< FLA
A
factor
= 1 if l
avg
>= FLA
Trip/Alarm Pickup Level:..................................4.0 to 50.0% in steps of 0.1%
Trip Operating Curves: .....................................Definite Time: T=TDM sec
Inverse Time: T= (TDM/[Unbal]
2
) sec
Trip Pickup Delay: ...............................................0.00 to 180.00 s in steps of 0.01 s when Trip Curve = Definite
Time
Trip Time Dial Multiplier (TDM):.....................0.00 to 180.00 in steps of 0.01 when Trip Curve = Inverse
Curve
Trip Maximum Time: .........................................0.00 to 1000.00 s in steps of 0.01 s
Trip Minimum Time:...........................................0.00 to 1000.00 s in steps of 0.01 s
Trip Reset Time:...................................................0.00 to 1000.00 s in steps of 0.01 s
Alarm Time Delay:..............................................0.00 to 180.00 s in steps of 0.01 s
Single Phasing Pickup Level: ......................... unbalance level > 40% or when I
avg
>=25%FLA and current
in any phase is less than the cutoff current
Single Phasing Time Delay:............................ 2 seconds
Pickup Accuracy:.................................................±2%
Operate Time: ......................................................<2 cycles at 1.10 x pickup (NOTE 1)
Timing Accuracy:................................................±3% of delay setting time or ± 20 ms, whichever is greater
Element: ..................................................................Trip and Alarm
Single Phasing Element: ..................................Trip
MECHANICAL JAM
Operating Condition:.........................................Phase Overcurrent
Arming Condition:...............................................Motor not starting
Pickup Level: .........................................................1.00 to 10.00 x FLA in steps of 0.01
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy:.................................................... For 0.1 to 2.0 x CT: ±0.5% of reading; at > 2.0 x CT rating:
±1.5% of reading
Pickup Delay: ........................................................0.10 to 180.00 s in steps of 0.01
Dropout Delay:.....................................................0.00 to 180.00 s in steps of 0.01
Timer Accuracy: .................................................. ±3% of delay setting time or ±20 ms, whichever is greater