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CHAPTER 6: SETPOINTS
Phase reversal (47)
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
The 339 can detect the phase rotation of the three phase voltages. When all three Phase to
Phase Voltages (Vab, Vbc and Vca) are greater than 50% of the Motor Rated Voltage, if the
phase rotation of the three phase voltages is not the same as the Supply Rotation setpoint,
and there is no fuse failure, either an alarm or a trip and a Start Inhibit will occur within
100ms.
PATH:
SETPOINTS > S3 PROTECTION > PHASE REVERSAL
PHASE REVERSAL FUNCTION
Range: Disabled, Alarm, Trip
Default: Disabled
For details see
Common
Figure 6-40: Phase Reversal Protection logic diagram
SETTING
Supply Rotation
Vab
Vbc
Phase Reversed
Vca
LOGIC OPERAND
Fuse Fail
ACTUAL VALUE
Vab > 50% x Rated
Vbc > 50% x Rated
AND
Vca > 50% x Rated
SETTING
Phase Reversal
= Disabled
= Alarm
= Trip
MOTOR STATUS
Running
KEYPAD RESET
INPUTS
Emergency Restart Input
Lockout Reset Input
Reset Input
SETTINGS
S4 CONTROLS
Emergency Restart
Off = 0
Lockout Reset
Off = 0
Reset
Off = 0
setpoints.
0.1 s
AND
0
AND
AND
AND
S3 PROTECTION
LOGIC OPERAND
PH Reversal Alarm
AND
Any Alarm Op
TARGET MESSAGE
PH Reversal Alarm
State: Operate
PH Reversal Trip
State: Operate
AND
S
LOGIC OPERAND
PH Reversal Trip
LATCH
Any Trip Op
R
Set Dominant
LOGIC OPERAND
AND
PH Rvrsl Inhibit
Any Start Inhibit
OR
896838.cdr
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