ABB ACSM1 Firmware Manual page 53

Mechanical brake state diagram
BSM = Brake State
Machine
* Depends on setting of
par. 35.09 BRAKE
FAULT FUNC.
BRAKE NOT OPEN
NN
State (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
COMMAND.)
X: 1 = Forced start (inverter is modulating). The function keeps the internal Start command on until the brake is closed regardless of the status of the
external Stop. Effective only when ramp stop has been selected as the stop mode
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).
State change conditions (Symbol
1) Brake control is active (35.01 BRAKE CONTROL
control mode is forced to speed/scalar.
2) External start command is on AND brake open request is on (source selected by
3) Starting torque required at brake release is reached
Note: With scalar control, the defined starting torque has no effect.
4) Brake is open (acknowledgement = 1, selected by par.
DELAY). Start = 1.
5) 6) Start = 0 OR brake close command is active AND actual motor speed < brake close speed
7) Brake is closed (acknowledgement = 0) AND brake close delay has passed
8) Start = 1.
9) Brake is open (acknowledgement = 1) AND brake close delay has passed.
10) Defined starting torque at brake release is not reached.
11) Brake is closed (acknowledgement = 0) AND brake open delay has passed.
12) Brake is closed (acknowledgement = 0).
13) Brake is open (acknowledgement = 1) AND brake close delay has passed.
9)
Fault/Alarm*
BRAKE NOT CLOSED
10)
Fault/Alarm*
BRAKE START TORQUE
11)
12)
Fault/Alarm* Fault/Alarm*
BRAKE NOT CLOSED
)
W/X/Y/Z
)
= (1) WITH ACK
(35.06 BRAKE OPEN
35.02 BRAKE
From any state
1)
BSM STOPPED
2)
BSM
START
3)
OPEN
BRAKE
4)
RELEASE
RAMP
6)
CLOSE
BRAKE
13)
8)
7)
(11.03 STOP MODE). Run enable and faults override the forced
or (2) NO ACK) OR modulation of the drive is requested to stop. The drive
35.07 BRAKE CLOSE REQ
TORQ) AND brake hold is not active
ACKNOWL) AND the brake open delay has passed
(35.05 BRAKE CLOSE
(35.04 BRAKE CLOSE
0/0/1/1
0/1/1/1
1/1/1/1
1/1/0/0
5)
0/1/1/0
= 0).
(35.08 BRAKE OPEN
(35.03 BRAKE OPEN
SPD).
DLY). Start = 0.
Drive control and features
53
3.15 BRAKE
HOLD).