Process Pid Control - ABB ACQ80-04 Firmware Manual

Dry run protection through DI
The dry run protection through DI
the pump based on the digital signals received from the sensors. The drive trips on
fault D4B0 Running dry
• 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
run trip monitor
Note: Fault D4B0 cannot be reset until selected DI in parameter
is high.
Dry run protection through minimum load current
The dry run protection through minimum load current
detects the dry run condition of the pump based on the minimum load current value
defined in the parameter
The drive trips on the fault
• actual current of the motor is less than the dry run current limit set in parameter
82.46 Dry run current
• actual speed of the motor is greater than the minimum speed set in parameter
79.51 Pump minimum
• both the conditions exists for the time set in parameter
time.
Settings
Parameter group 82 Pump protections


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.
(82.02
whenever
time.
82.46 Dry run current
D4B0 Running dry
limit,
speed, and
= any DI), detects the dry run condition of
(82.02
limit.
whenever the
(page 160).
Program features 39
82.47 Dry
82.02 Dry run source
= Min load current)
82.47 Dry run trip monitor