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CHAPTER 1: INTRODUCTION
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUND FAULT
Pickup Level:..........................................................0.03 to 1.00 x CT in steps of 0.01 x CT
Dropout Level: ......................................................Pickup - 0.02 x CT
Alarm Time Delay on Run: ..............................0.00 to 60.00 s in steps of 0.01 s
Alarm Time Delay on Start: ............................0.00 to 60.00 s in steps of 0.01 s
Trip Time Delay on Run:...................................0.00 to 5.00 s in steps of 0.01 s
Trip Time Delay on Start:.................................0.00 to 10.00 s in steps of 0.01 s
Pickup Accuracy:.................................................as per ground current inputs
Operate Time:.......................................................<30 ms @ 60Hz (I > 2.0 x PKP), 0 ms time delay
Timing Accuracy: ................................................0 to 1 cycle
Elements: ................................................................Trip and Alarm
THERMAL PROTECTION
Locked Rotor Current:.......................................2.0 to 11.0 x FLA in steps of 0.1 x FLA
Safe Stall Time:.....................................................1.0 to 600.0 s in steps of 0.1 s
Curve Multiplier:...................................................1 to 15 in steps of 1
Pickup Level:..........................................................1.01 to 1.25 x FLA in steps of 0.01 x FLA
Curve Biasing:.......................................................Phase unbalance
TCU Update Rate: ...............................................3 cycles
Pickup Accuracy:.................................................per phase current inputs
Timing Accuracy: ................................................±200 ms or ±2% of total time
Elements: ................................................................Trip and Alarm
PHASE/AUXILIARY UNDERVOLTAGE
Minimum Voltage:...............................................Programmable from 0.00 to 1.25 x VT in steps of 0.01
Pickup Level:..........................................................0.00 to 1.25 x VT in steps of 0.01
Dropout Level: ......................................................101 to 104% of pickup
Curve: .......................................................................Definite Time, Inverse Time
Time Delay: ............................................................0.1 to 600.0 s in steps of 0.1
Operate Time:.......................................................Time delay ±30 ms @ 60 Hz (V < 0.85 x PKP)
Time Delay Accuracy: .......................................±3% of expected time, or 1 cycle, whichever is greater
Level Accuracy:....................................................Per voltage input
UNDERPOWER
Pickup Level:..........................................................1 to 100% Hz MNR 1%
Dropout Level: ......................................................101% to 104% of Pickup
Time Delay: ............................................................1.0 to 60.0 s in steps of 0.1
Pickup Accuracy:.................................................as per power monitoring specification
Timing Accuracy: ................................................±0.5 s or ±0.5% of total time
Elements: ................................................................Trip and Alarm
NEGATIVE SEQUENCE/PHASE OVERVOLTAGE
Pickup Level:..........................................................0.00 to 1.25 x VT in steps of 0.01
Dropout Level: ......................................................96 to 99% of pickup
Time Delay: ............................................................0.1 to 600.0 s in steps of 0.1
Operate Time:.......................................................Time delay ±30 ms @ 60 Hz (V < 0.85 x PKP)
Timing Accuracy: ................................................±0.5 s or ±0.3% of total time
Level Accuracy:....................................................Per voltage input
0.50 to 15.00 A in steps of 0.01 A (CBCT)
96 to 99% of Pickup (CBCT)
<35 ms @ 50Hz (I > 2.0 x PKP), 0 ms time delay
Hot/cold biasing
Stator RTD biasing
Exponential Running and Stopped Cooling Rates
Time delay ±40 ms @ 50 Hz (V < 0.85 x PKP)
Time delay ±40 ms @ 50 Hz (V < 0.85 x PKP)
SPECIFICATIONS
1–9
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