Program features 39
Dry run protection through DI
The dry run protection through DI (82.02 = any DI), detects the dry run condition of
the pump based on the digital signals received from the sensors. The drive trips on
fault D4B0 Running dry whenever
• the sensor detects the dry run condition and sends the digital input value true to
the drive, and
• the dry run condition value exists for the time mentioned in parameter 82.47 Dry
run trip monitor time.
Note: Fault D4B0 cannot be reset until selected DI in parameter 82.02 Dry run source
is high.
Dry run protection through minimum load current
The dry run protection through minimum load current (82.02 = Min load current)
detects the dry run condition of the pump based on the minimum load current value
defined in the parameter 82.46 Dry run current limit.
The drive trips on the fault D4B0 Running dry whenever the
• actual current of the motor is less than the dry run current limit set in parameter
82.46 Dry run current limit,
• actual speed of the motor is greater than the minimum speed set in parameter
79.51 Pump minimum speed, and
• both the conditions exists for the time set in parameter 82.47 Dry run trip monitor
time.
Settings
Parameter group 82 Pump protections (page 160).
Process PID control
The drive has a built-in process PID controller that controls process variables such as
pressure or flow of the pipe or fluid level in a container.
The process PID control has the following features:
• Uses the process reference/setpoint as an alternative to the speed reference
• The actual value or the process feedback is input to the drive
• The PID control adjusts the drive speed to maintain the measured process
quantity (actual value) at the desired level.
• Enables the drive to adjust its operation according to the process feedback. Thus
the user need not set the speed/frequency reference.
ACQ80 FW.book Page 39 Thursday, February 14, 2019 11:33 AM
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