Delta MM300 Instruction Manual Page 123

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6–36 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
PROTECTION ELEMENTS CHAPTER 6: SETPOINTS
6.3.2.2 Undercurrent protection
When the motor is in the running state, a trip or alarm will occur should the magnitude Ia,
Ib, or Ic fall below the pickup level for the time specified by the
Undercurrent Alarm Delay.
The pickup levels should be set lower than the lowest motor loading during normal
operations.
The following setpoints are available for the undercurrent protection element.
Undercurrent Trip Level
Range: 1 to 100% of FLA or OFF
Default: OFF
This setpoint specifies the undercurrent trip pickup level. A value of “OFF” disables the
undercurrent trip function.
Undercurrent Trip Delay
Range: 1 to 60 seconds in steps of 1
Default: 1 second
This setpoint specifies the time that the motor current must exceed pickup to generate a
trip.
Undercurrent Alarm Level
Range: 1 to 100% of FLA or OFF
Default: OFF
This setpoint specifies the undercurrent alarm pickup level. A value of “OFF” disables the
undercurrent alarm function.
Undercurrent Alarm Delay
Range: 1 to 60 seconds in steps of 1
Default: 1 seconds
This setpoint represents the time that the motor current must exceed pickup to generate
an alarm.
For example, if a pump is cooled by the liquid it pumps, loss-of-load may mean that the
pump overheats. In this case, the undercurrent feature is enabled. To prevent motor
loading from falling below 0.75 × FLA, even for short durations, the
Undercurrent Trip Level
could be set to “70%” and the
Undercurrent Alarm Level to “75%”. The Undercurrent Trip
Delay
and Undercurrent Alarm Delay setpoints are typically set as quick as possible (that is,
1 second).
6.3.2.3 Underpower protection
Underpower protection is available whether or not a type I0_B module (3 x VT) is included
in the order code. When this option is included, the power is calculated using the voltages
connected to this card. When this option is not included, the power is calculated using the
auxiliary voltage and assumes that the missing voltages are balanced.
When the motor is in the running state, a trip or alarm will occur if the magnitude of the
real power falls below the pickup level for the time specified by the
Underpower Alarm
Delay setpoint. The pickup levels should be less than the lowest motor loading during
normal operations.
Setpoint levels are a percentage of MNR, where MNR is the "Motor Rating Setpoint."
The following setpoints are available for the underpower protection feature.
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