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CHAPTER 1: INTRODUCTION SPECIFICATIONS
LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–7
1.5 Specifications
1.5.1 Protection Elements
OVERCURRENT (ANSI 51)
Curve shapes: ..................................................NEMA class 10, 15, 20 and 30, hot and cold
Timing accuracy:............................................±5% of total trip time + 1 second
GROUND FAULT
Pickup level: .....................................................0.4 to 20.0 A in steps of 0.2
Pickup accuracy: ............................................±5% or ±0.1 A, whichever is greater
Time delay:........................................................0 to 2.5 seconds in steps of 0.1
Timing accuracy:............................................±200 ms
CURRENT UNBALANCE (ANSI 46)
Pickup level: .....................................................2 to 25% in steps of 1
Pickup accuracy: ............................................±5%
Time delay:........................................................0 to 255 seconds in steps of 1
Timing accuracy:............................................±5% of total trip time + 1 second
MECHANICAL JAM
Pickup level: .....................................................100 to 250% in steps of 1
Pickup Accuracy:............................................±5%
Time delay:........................................................0 to 1000 seconds in steps of 5
Timing accuracy:............................................±5% of total trip time + 1 second
STALL
Pickup level: .....................................................330 to 600% in steps of 5
Pickup Accuracy:............................................±5%
Time delay:........................................................0 to 30.0 seconds in steps of 0.5
Timing accuracy:............................................±5% of total trip time + 1 second
LOAD LOSS
Pickup level: .....................................................15 to 100% in steps of 1
Pickup Accuracy:............................................±5%
Time delay:........................................................0 to 255 seconds in steps of 1
Timing accuracy:............................................±5% of total trip time + 1 second
UNDERVOLTAGE/OVERVOLTAGE
Undervoltage pickup level: 80% of nominal voltage (96 V)
Overvoltage pickup level: 117% of nominal voltage (140 V)
Pickup accuracy: ............................................±5%
Trip time:.............................................................0.5 second
Timing accuracy:............................................±200 ms
1.5.2 Metering
PHASE CURRENT
Resolution:.........................................................0.1 A
Range:..................................................................0.05 to 8 × CT Primary (3200.0 A max.)
Accuracy: ...........................................................±5% of full scale