Program features 151
Supervisions
The drive monitors whether certain user selectable variables are within the user-
defined limits. The user may set limits for speed, current etc. The supervision status
can be indicated through relay or digital output.
The supervision functions operate on a 2 ms time level.
Settings
Diagnostics
Parameter lock
The user can prevent parameter adjustment by activating the parameter lock.
Settings
Parameters
PID control
There are two built-in PID controllers in the drive:
• Process PID (PID1) and
• External/Trim PID (PID2).
The PID controller can be used when the motor speed needs to be controlled based
on process variables such as pressure, flow or temperature.
When the PID control is activated, a process reference (setpoint) is connected to the
drive instead of a speed reference. An actual value (process feedback) is also
brought back to the drive. The drive compares the reference and the actual values,
and automatically adjusts the drive speed in order to keep the measured process
quantity (actual value) at the desired level (reference).
The control operates on a 2 ms time level.
Actual signal
Additional information
Supervision status through RO 1
/
Supervision status through RO 2…4. With option
MREL-01 only.
Supervision status through DO
,
/
8435
,
8436
/…/
8495
,
8496
Sequence programming state change according to
supervision functions
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...