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Program features 67
Quick configuration of the process PID controller
1. Activate the process PID controller (parameter
).
2. Select a feedback source (parameters
3. Select a setpoint source (parameters
…
4. Set the gain, integration time, derivation time, and the PID output levels (
,
,
and
).
5. The PID controller output is shown by parameter
. Select it as the source of, for example,
.
Sleep function for process PID control
The sleep function can be used in PID control applications that involve relatively long
periods of low demand (for example, a tank is at level), During such periods, the
sleep function saves energy by stopping the motor completely, instead of running the
motor slowly below the efficient operating range of the system. When the feedback
changes, the PID controller wakes the drive up.
Note:
The sleep function is disabled when mechanical brake control (see page
) is
active.
Example:
The drive controls a pressure boost pump. The water consumption falls at
night. As a consequence, the process PID controller decreases the motor speed.
However, due to natural losses in the pipes and the low efficiency of the centrifugal
pump at low speeds, the motor would never stop rotating. The sleep function detects
the slow rotation and stops unnecessary pumping after the sleep delay has passed.
The drive shifts into sleep mode, still monitoring the pressure. The pumping resumes
when the pressure falls under the wake-up level (setpoint - wake-up deviation) and
the wake-up delay has passed.
Содержание ACS880-x04
Страница 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Страница 4: ......
Страница 18: ...18 Using the control panel ...
Страница 24: ...24 Control locations and operating modes ...
Страница 111: ...Application macros 111 Fieldbus control macro This application macro is not supported by the current firmware version ...
Страница 112: ...112 Application macros ...
Страница 496: ...496 Additional parameter data ...
Страница 544: ...544 Fault tracing ...
Страница 602: ...602 Control chain diagrams ...