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DESCRIPTION OF THE 339 MOTOR PROTECTION SYSTEM
Ambient air
RTD
1–4
Figure 2: Line Diagram
BUS
52
Phase CT 3
Ground CT 1
Stator RTDs
Bearing RTDs
MOTOR
Table 1: Protection functions
ANSI device
27P
37
38
46
47
48
49
50BF
50G
50P
51P
50N
59_2
59P
66
81O
81U
86
VTFF
27P 59P 47 59_2 81O 81U
37
46
50G
49
38
LOAD
339
MOTOR PROTECTIO SYSTEM
Description
Phase UV
Undercurrent
Underpower
Bearing RTD
Stator/Ambient/Other
RTD Trouble Alarm
Current Unbalance
Voltage Phase Reversal
Acceleration Time
Thermal Protection/Stall Protection
Breaker Failure / Welded Contactor
Ground Fault
Short Circuit
Mechanical Jam
Neutral Instantaneous Overcurrent
Negative Sequence OV
Phase OV
Starts per Hour & Time Between Starts
Restart Block
Thermal Inhibit
Overfrequency
Underfrequency
Lockout
VT Fuse Failure
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
59_2
49
50P 50BF
51
50
TRIP
CLOSE
START INHIBIT
86
896814.CDR
START
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