ABB ACS850 - Page 36

36 Program features
Settings
Parameter group 42 Mech brake ctrl (page 169).
State (Symbol )
State change conditions
(Symbol )
- NN: State name
- W/X/Y/Z: State outputs/operations
W: 1 = Brake open command is active. 0 = Brake close command is active. (Controlled
through selected digital/relay output with signal 03.16 Brake command.)
X: 1 = Forced start (inverter is modulating). The function keeps the internal Start on until the
brake is closed in spite of the status of the external Stop. Effective only when ramp stop
has been selected as the stop mode (11. 03 Stop mode). Run enable and faults override
the forced start. 0 = No forced start (normal operation).
Y: 1 = Drive control mode is forced to speed/scalar.
Z: 1 = Ramp generator output is forced to zero. 0 = Ramp generator output is enabled
(normal operation).
1) Brake control is active (42.01 Brake ctrl = With ack or No ack) OR modulation of the drive
is requested to stop. The drive control mode is forced to speed/scalar.
2) External start command is on AND brake open request is on (source selected by 42.10
Brake close req is 0) AND reopen delay (42.07 Reopen delay) has elapsed.
BSM = Brake State Machine
* Depending on setting of parameter
42.12 Brake fault func
0/0/1/1
0/1/1/1
1/1/1/1
1/1/0/0
0/1/1/0
5)
8)7)
13)
12)
11)
10)
9)
6)
1)
2)
3)
4)
From any state
BSM
STOPPED
BSM
START
OPEN
BRAKE
RELEASE
RAMP
CLOSE
BRAKE
Fault/Alarm*
BRAKE NOT CLOSED
Fault/Alarm*
BRAKE NOT OPEN
Fault/Alarm*
BRAKE NOT CLOSED
Fault/Alarm*
BRAKE START TORQUE
NN
W/X/Y/Z