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86 Program features
State change conditions (
)
BRAKE OPENING DELAY
Opening conditions have been met and open signal activated (
44.01
Brake
control status
b0 is set). The opening torque request is removed (
44.01
Brake
control status
b1
→
0). The load is held in place by the speed control of the
drive until
44.08
Brake open delay
elapses.
At this point, if
44.07
Brake acknowledge selection
is set to
No acknowledge
,
the logic proceeds to BRAKE OPEN state. If an acknowledgement signal
source has been selected, its state is checked; if the state is not “brake open”,
the drive trips on a
71A3
Mechanical brake opening failed
fault
*)
.
BRAKE OPEN
The brake is open (
44.01
Brake control status
b0 = 1). Hold request is removed
(
44.01
Brake control status
b2 = 0), and the drive is allowed to follow the
reference.
BRAKE CLOSING
BRAKE CLOSING WAIT
Brake has been requested to close. The drive logic is requested to ramp down
the speed to a stop (
44.01
Brake control status
b3 = 1). The open signal is kept
active (
44.01
Brake control status
b0 = 1). The brake logic will remain in this
state until the motor speed is below
44.14
Brake close level
for the time defined
by
44.15
Brake close level delay
.
BRAKE CLOSING DELAY
Closing conditions have been met. The open signal is deactivated (
44.01
Brake
control status
b0
→
0). The ramp-down request is maintained (
44.01
Brake
control status
b3 = 1). The brake logic will remain in this state until
44.13
Brake
close delay
has elapsed.
At this point, if
44.07
Brake acknowledge selection
is set to
No acknowledge
,
the logic proceeds to BRAKE CLOSED state. If an acknowledgment signal
source has been selected, its state is checked; if the state is not “brake closed”,
the drive generates an
A7A1
Mechanical brake closing failed
warning. If
44.17
Brake fault function
= Fault, the drive will trip on a
71A2
Mechanical brake
closing failed
fault after
44.18
Brake fault delay
.
BRAKE CLOSED
The brake is closed (
44.01
Brake control status
b0 = 0). The drive is not
necessarily modulating.
Note concerning open-loop (encoder-less) applications:
If the brake is kept
closed by a brake close request (either from parameter
44.12
) against a
modulating drive for longer than 5 seconds, the brake is forced to closed state
and the drive trips on a fault,
71A5
Mechanical brake opening not allowed
.
*) A warning can alternatively be selected by parameter
44.17
Brake fault function
; if so, the drive will keep
modulating and remain in this state.
1
Brake control disabled (parameter
44.06
Brake control enable
→
0).
2
06.11
Main status word
, bit 2 = 0.
3
Brake has been requested to open and
44.16
Brake reopen delay
has expired.
4
Brake open conditions (such as
44.10
Brake open torque
) fulfilled and
44.11
Keep brake closed
= 0.
5
44.08
Brake open delay
has elapsed and brake open acknowledgement (if chosen by
44.07
Brake
acknowledge selection
) has been received.
6
Brake has been requested to close.
7
Motor speed has remained below closing speed
44.14
Brake close level
for the duration of
44.15
Brake close level delay
.
8
44.13
Brake close delay
has elapsed and brake close acknowledgment (if chosen by
44.07
Brake
acknowledge selection
) has been received.
9
Brake has been requested to open.
10
Brake control enabled (parameter
44.06
Brake control enable
→
1).
State name
Description
n
ACS380 FW.book Page 86 Friday, May 4, 2018 4:18 PM
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