ABB ACS880 Firmware Manual page 73

Timing diagram
The simplified timing diagram below illustrates the operation of the brake control
function. Refer to the state diagram above.
Start command
(06.16 b5)
Modulating (06.16 b6)
Ready ref (06.11 b2)
Torque reference
Speed reference
Brake control signal
(44.01 b0)
Opening torque
request (44.01 b1)
Hold stopped request
(44.01 b2)
Ramp to stopped
request (44.01 b3)
State
CLOSED
1
T Start torque at brake open (parameter
s
T Stored torque value at brake close
mem
t Motor magnetization delay
md
t Brake open delay (parameter
od
n Brake close speed (parameter
cs
t Brake close command delay (parameter
ccd
t Brake close delay (parameter
cd
t Brake close fault delay (parameter
cfd
t Brake reopen delay (parameter
rod
BOW BRAKE OPENING WAIT
BOD BRAKE OPENING DELAY
BCW BRAKE CLOSING WAIT
BCD BRAKE CLOSING DELAY
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t
md
T
s
t
od
BRAKE BOW BOD
BRAKE OPENING
2 3 4 5
44.03 Brake open torque
(44.02 Brake torque
44.08 Brake open
44.14 Brake close
44.15 Brake close level
44.13 Brake close
44.18 Brake fault
44.16 Brake reopen
Program features 73
n
cs
t
ccd
BCW
BRAKE OPEN
BRAKE CLOSING
6
reference)
memory)
delay)
level)
delay)
delay)
delay)
delay)
T
mem
t
rod
t t
cd cfd
BCD BRAKE
CLOSED
7 8 9