Delta MM300 Instruction Manual Page 129

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6–42 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
PROTECTION ELEMENTS CHAPTER 6: SETPOINTS
The following setpoints are available for the phase overvoltage element.
[Path: Home > Setpoints > Protection > Electrical]
Overvoltage Alarm Level
Range: 101 to 120% of MNV in steps of 1, or OFF
Default: OFF
This setpoint specifies the overvoltage alarm pickup level as a percentage of the rated
voltage.
Overvoltage Alarm Delay
Range: 1 to 60 seconds in steps of 1 s
Default: 30 seconds
This setpoint specifies the time that the voltage must meet or exceed the overvoltage
alarm pickup level to generate an alarm.
Overvoltage Trip Level
Range: 101 to 120% of MNV in steps of 1, or OFF
Default: OFF
This setpoint specifies the overvoltage trip pickup level as a percentage of the rated
voltage.
Overvoltage Trip Delay
Range: 1 to 60 seconds in steps of 1 s
Default: 30 seconds
This setpoint specifies the time that the voltage must meet or exceed the overvoltage
trip pickup level to generate a trip.
6.3.3.7 Phase reversal
The MM300 can detect the phase rotation of the three phase voltages.
NOTE
NOTE:
Phase reversal protection is available only when a type IO_B option card (3 × VT) is
specified in the order code. This element assumes A-B-C connection.
The following setpoints are available.
[Path: Home > Setpoints > Protection > Electrical]
Voltage Phase Reversal
Range: Disabled, Alarm, Trip
Default: Trip
This setpoint selects the phase reversal action.
6.3.3.8 Fuse failure
If one or two of the three phase voltages drops to less than 70% of nominal, and at the
same time any of the three voltages is greater than 85%, either an alarm or a trip and
block start will occur after a one second delay. The 70% threshold allows for the possibility
that the voltage downstream from a blown fuse is pulled up above zero by devices
connected between the open fuse and another phase.
NOTE
NOTE:
Fuse failure protection is available only when a type IO_B option card (3 × VT) is specified in
the order code.
The following setpoints are available.
[Path: Home > Setpoints > Protection > Electrical]
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