ID 442426.04
246
WE KEEP THINGS MOVING
Holding brake
11
Manual SD6
After the brake test action is complete, the result can be queried here.
The drive controller keeps an internal brake test memory with the last 20 results
from
B300[2]
as well as the holding torques actually achieved in positive and
negative direction. When the result is
0:error free
these torques correspond to
the values parameterized in
B304[x]
and
B305[x]
. If the values retained in
brake test memory are smaller, the brake test was not successful.
The maximum distance traversed during the brake test is about 45° in both
directions. If one direction of rotation is restricted, the distance traversed is
about 2 × 45° in the permitted direction. A stopping distance depending on the
torque limit and mass moment of inertia is added in both cases. If a mechanical
system is connected, the transmission ratio of the gear must also be included
in the calculations. If both directions of rotation are permitted in
B306
, the
movement in the positive direction is performed first. Note that this calculation
is only valid if the brake is intact. If the tested brake does not apply the required
holding torque, the distance traversed cannot be calculated. In this case the
drive controller switches off within < 10 ms and closes a second brake if one is
fitted. The set time and performance level of the second brake will therefore
have a significant effect on stopping the drive. If there is no second brake, the
motor coasts down.
The drive controller keeps an internal brake test memory with the last 20 results
from
B300[2]
as well as the holding torques actually achieved in positive and
negative direction. When the result is
0:error free
these torques correspond to
the values parameterized in
B304[0]
and
B305[0]
. If the values retained in
brake test memory are smaller, the brake test was not successful.
The maximum distance traversed during the brake test is about 45° in both
directions on the motor side. If one direction of rotation is restricted, the
distance traversed is about 2 × 45° in the permitted direction. A stopping
distance depending on the torque limit and mass moment of inertia is added in
both cases. If a mechanical system is connected, the transmission ratio of the
gear must also be included in the calculations. If both directions of rotation are
permitted in
B306
, the movement in the positive direction is performed first.
Note that this calculation is only valid if the brake is intact. If the tested brake
does not apply the required holding torque, the distance traversed cannot be
calculated. In this case the drive controller switches off within < 10 ms. The
motor coasts down.
11.9.3
Multi-axis operation
Please note that axis 1 must be selected for the action when you use multi-axis
operation.
11.10 Brake grinding function
When the brake grinding function is performed, the brake engages repeatedly
for about 0.7 seconds and is then released for about 0.7 seconds while the
motor turns at about 20 rpm. This grinds off coatings that have accumulated
which could have a detrimental effect on the holding function. You can
parameterize:
•
how often the brake engages while turning in one direction (
B308
),
•
how often the drive will turn in each direction (
B309
) and
•
whether one direction of rotation will be disabled (
B306
).
The maximum distance traversed is
B308
× 0.5 motor revolutions. If a
mechanical system is connected, the transmission ratio of the gear must also
be included in the calculations. If both directions of rotation are permitted in
B306
, the movement in the positive direction is performed first.
B300[2]
brake test result
version 1
