ABB ACS880-04XT - Page 110

110 Program features
Timing diagram
The simplified timing diagram below illustrates the operation of the brake control
function. Refer to the state diagram above.
T
s
Start torque at brake open (parameter 44.03 Brake open torque reference)
T
mem
Stored torque value at brake close (44.02 Brake torque memory)
t
md
Motor magnetization delay
t
od
Brake open delay (parameter 44.08 Brake open delay)
n
cs
Brake close speed (parameter 44.14 Brake close level)
t
ccd
Brake close command delay (parameter 44.15 Brake close level delay)
t
cd
Brake close delay (parameter 44.13 Brake close delay)
t
cfd
Brake close fault delay (parameter 44.18 Brake fault delay)
t
rod
Brake reopen delay (parameter 44.16 Brake reopen delay)
BOW BRAKE OPENING WAIT
BOD BRAKE OPENING DELAY
BCW BRAKE CLOSING WAIT
BCD BRAKE CLOSING DELAY
Start command
(06.16 b5)
Modulating (06.16 b6)
T
mem
1 2345 6 7 89
Ready ref (06.11 b2)
Torque reference
Speed reference
Brake control signal
(44.01 b0)
Opening torque
request (44.01 b1)
Ramp to stopped
request (44.01 b3)
Hold stopped request
(44.01 b2)
t
od
T
s
n
cs
t
ccd
t
cd
t
cfd
t
rod
BRAKE
CLOSED
State
BRAKE
CLOSED
BRAKE OPEN
BRAKE OPENING BRAKE CLOSING
BOW BOD BCW BCD
t
md