ABB ACS850 - Page 73

Program features 73
State change conditions (Symbol )
X: 1 = Forced start (inverter is modulating). The function keeps the internal start command
on until the brake is closed in spite of the status of the external stop command. 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.
3) Starting torque required at brake release is reached (42.08 Brake open torq) AND brake
hold is not active (42.11 Brake hold open). Note: With scalar control, the defined starting
torque has no effect.
4) Brake is open (acknowledgement source selected by par. 42.02 Brake acknowl is 1)
AND the brake open delay has elapsed (42.03 Open delay). Start = 1.
5) 6) Start = 0 OR brake close command is active AND actual motor speed < brake close
speed (42.05 Close speed) AND close command delay (42.06 Close cmd delay) has
elapsed.
7) Brake is closed (acknowledgement = 0) AND brake close delay (42.04 Close delay) has
elapsed. Start = 0.
8) Start = 1 AND brake open request is on (source selected by 42.10 Brake close req is 0)
AND reopen delay has elapsed.
9) Brake is open (acknowledgement = 1) AND brake close delay has elapsed.
10) Defined starting torque at brake release is not reached.
11) Brake is closed (acknowledgement = 0) AND brake open delay has elapsed.
12) Brake is closed (acknowledgement = 0).
13) Brake is open (acknowledgement = 1) AND brake close delay has elapsed. Fault is
generated after brake close fault delay (42.13 Close flt delay) has elapsed.
14) Brake is closed (acknowledgement = 1) AND extended run delay (42.14 Extend run time)
has elapsed. Start = 0.