Mechanical Brake Control - ABB +N5600 Firmware Instructions

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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
108. The tables below the state diagram detail the states and transitions. The timing
diagram on page 110
The mechanical brake control logic operates on a 10 ms time level.
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
selection),
• bit 2 of 06.11 Main status word
given reference or not),
• bit 6 of 06.16 Drive status word 1
not),
• optional FSO-xx safety functions module.
Outputs of the brake control logic
The mechanical brake is to be controlled by bit 0 of parameter
status. This bit should be selected as the source of a relay output (or a digital
input/output in output mode) which is then wired to the brake actuator through a relay.
See the wiring example on page 111.
The brake control logic, in various states, will request the drive control logic to hold
the motor, increase the torque, or ramp down the speed. These requests are visible in
parameter 44.01 Brake control
Settings
Parameter group 44 Mechanical brake control
44 Mechanical brake control
shows an example of a close-open-close sequence.
06.16 Drive status word
request. The two signals interact as follows:
44.11 Keep brake closed
(indicates whether the drive is ready to follow the
(indicates whether the drive is modulating or
status.
Program features 107
as well as several
1) is the main control
44.12 Brake close request
44.12 Brake close request
to prevent the brake from opening.
44.07 Brake acknowledge
44.01 Brake control
(page 357).
= 0
= 1