Mechanical Brake Control - ABB ACS380 Firmware Manual

ACS380 FW.book Page 84 Friday, May 4, 2018 4:18 PM
84 Program features
Tracking
In tracking mode, the PID block output is set directly to the value of parameter
Set 1 tracking ref selection
of the PID controller is set so that no transient is allowed to pass on to the output, so
when the tracking mode is left, normal process control operation can be resumed
without a significant bump.
Settings
Parameter 96.04 Macro select
Parameter groups
273).


Mechanical brake control

A mechanical brake can be used for holding the motor and driven machinery at zero
speed when the drive is stopped, or not powered. The brake control logic observes
the settings of parameter group
external signals, and moves between the states presented in the diagram on
page 85. The tables below the state diagram detail the states and transitions. The
timing diagram on page
For application example, see section
Inputs of the brake control logic
The start command of the drive (bit 5 of
source of the brake control logic. An optional external open/close signal can be
selected by 44.12 Brake close
• Start command = 1 AND signal selected by
→ Request brake to open
• Start command = 0 OR signal selected by
→ Request brake to close
Another external signal – for example, from a higher-level control system – can be
connected via parameter
Other signals that affect the state of the control logic are
• brake status acknowledgment (optional, defined by parameter
acknowledge selection),
• bit 2 of 06.11 Main status word
given reference or not),
• bit 6 of 06.16 Drive status word 1
not).
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(or 41.50 Set 2 tracking ref
(page 332).
40 Process PID set 1(page 259) and
44 Mechanical brake control
87 shows an example of a close-open-close sequence.
Crane mechanical brake control
06.16 Drive status word
request. The two signals interact as follows:
44.12 Brake close request
44.11 Keep brake closed
(indicates whether the drive is ready to follow the
(indicates whether the drive is modulating or
selection).The internal I term
41 Process PID set 2
as well as several
on page 533.
1) is the main control
44.12 Brake close request = 0
= 1
to prevent the brake from opening.
44.07 Brake
40.50
(page