Operation Time Scheme - ABB ACS355 User Manual

158 Program features

Operation time scheme

The time scheme below illustrates the operation of the brake control function. See
also section State shifts
Start command
External speed
reference
Inverter modulating
Motor magnetized
Open brake command
(RO/DO)
Internal speed
reference (actual
motor speed)
I / Torque
output
I /T Brake open current/torque (parameter
s s
current/torque from parameter
I /T Brake close current/torque (saved in parameter
mem mem
t Motor magnetizing delay (parameter
md
t Brake open delay (parameter
od
n Brake close speed (parameter
cs
t Mechanical brake close delay
cd
on page 159.
1
2
t
md
t
3
od
I /T
s s
0179 BRAKE TORQUE
4301 BRAKE OPEN
4303 BRAKE CLOSE
4
I /T
mem
4302 BRAKE OPEN LVL
MEM)
0179 BRAKE TORQUE
4305 BRAKE MAGN
DLY)
LVL)
7
n
cs
mem
t
cd
or
MEM)
DELAY)
t