ABB ACS850-04 - Page 68

68 Program features
Operation time scheme
The simplified time scheme below illustrates the operation of the brake control
function.
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
T
s
Start torque at brake release (parameter 42.08 Brake open torq)
T
mem
Stored torque value at brake close (signal 03.15 Brake torq mem)
t
md
Motor magnetising delay
t
od
Brake open delay (parameter 42.03 Open delay)
n
cs
Brake close speed (parameter 42.05 Close speed)
t
ccd
Brake close command delay (parameter 42.06 Close cmd delay)
t
cd
Brake close delay (parameter 42.04 Close delay)
Start cmd
Modulating
Ref_Running
Brake open
cmd
Ramp output
Torque ref
Ramp input
Time
t
cd
T
mem
n
cs
T
s
t
od
t
md
123 4 56 7
t
ccd