ABB ACSM1 Manual page 57

Operation time scheme
The simplified time scheme below illustrates the operation of the brake control
function.
Start cmd
Ramp input
Modulating
Ref_Running
Brake open cmd
Ramp output
Torque ref
T
s
T
mem
t
md
t
od
n
cs
t
cd
Example
The figure below shows a brake control application example.
WARNING! Make sure that the machinery into which the drive with brake control
function is integrated fulfils the personnel safety regulations. Note that the frequency
converter (a Complete Drive Module or a Basic Drive Module, as defined in IEC
61800-2), is not considered as a safety device mentioned in the European
Machinery Directive and related harmonised standards. Thus, the personnel safety
of the complete machinery must not be based on a specific frequency converter
feature (such as the brake control function), but it has to be implemented as defined
in the application specific regulations.
T
s
t 2 3 t 4
1
md od
Start torque at brake release (parameter
Stored torque value at brake close (signal
Motor magnetising delay
Brake open delay (parameter
Brake close speed (parameter
Brake close delay (parameter
5
35.06 BRAKE OPEN
3.14 BRAKE TORQ
35.03 BRAKE OPEN DELAY)
35.05 BRAKE CLOSE SPD)
35.04 BRAKE CLOSE DLY)
n
cs
T
mem
6
7
t
cd
TORQ)
MEM)
Drive control and features
57
time