Brake has been requested to open. The drive logic is requested
to increase the torque up to opening torque to hold the load in
place (44.1 b1 = 1 and b2 = 1). The state of 44.11 is checked; if it
is not 0 within a reasonable time, the drive trips on a 71A5
fault
1)
.
BRAKE OPENING WAIT
Opening conditions have been met and open signal activated
(44.1 b0 is set). The opening torque request is removed (44.1
b1 → 0). The load is held in place by the speed control of the
drive until 44.8 elapses.
BRAKE OPENING DELAY
At this point, if 44.7 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 fault
1)
.
The brake is open (44.1 b0 = 1). Hold request is removed (44.1
b2 = 0), and the drive is allowed to follow the reference.
BRAKE OPEN
BRAKE CLOSING:
Brake has been requested to close. The drive logic is requested
to ramp down the speed to a stop (44.1 b3 = 1). The open signal
is kept active (44.1, b0 = 1). The brake logic will remain in this
state until the motor speed has remained below 44.14 for the
time defined by 44.15.
BRAKE CLOSING WAIT
Closing conditions have been met. The open signal is deactiv-
ated (44.1 b0 → 0) and the closing torque written into 44.2. The
ramp-down request is maintained (44.1 b3 = 1). The brake logic
will remain in this state until 44.13 has elapsed.
BRAKE CLOSING DELAY
At this point, if 44.7 is set to No acknowledge, the logic proceeds
to BRAKE CLOSED state. If an acknowledgement signal source
has been selected, its state is checked; if the state is not “brake
closed”, the drive generates an A7A1 warning. If 44.17 = Fault,
the drive will trip on a 71A2 fault after 44.18.
The brake is closed (44.1, b0 = 0). The drive is not necessarily
modulating.
BRAKE CLOSED
Note concerning open-loop (encoderless) applications: If the
brake is kept closed by a brake close request (either from
parameter 44.12 or an FSO-xx safety functions module) against
a modulating drive for longer than 5 seconds, the brake is forced
to closed state and the drive trips on a fault, 71A5.
1)
A warning can alternatively be selected by 44.17; if so, the drive will keep modulating and remain in
this state.
State change conditions:
Brake control disabled (parameter 44.6 → 0).1
6.11, bit 2 = 0 or brake is forced to close by optional FSO-xx safety functions module.2
Brake has been requested to open and 44.16 has expired.3
Brake open conditions (such as 44.10) fulfilled and 44.11 = 0.4
98 Program features
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