Tref Out; Tref Enable; Decel Cmnd; Lift Brake - ABB DCS 500B Description

TREF OUT

TREF ENABLE

DECEL CMND

LIFT BRAKE

BRAKE RUN

DCS 500 Software Description
TREF OUT (10301) is a output for torque reference which is used
when the brake is opened. This is normally connected to SPEED
CONTROL [BAL REF] (2009). This torque reference is set to in-
tegral part of speed controller by means of TREF ENABLE output
Logical output TREF ENABLE (10302) is activated when the
BR RELEASE changes 0 -->1 and is removed when START
DELAY has elapsed.
0 = TREF OUT (10301) is zero
-1 = TREF OUT (10301) is used as torque reference
Logical output DECEL CMND (10303) is used to control the speed
reference. It is active until acceleration starts when brake is re-
leased and it is activated again when [BR RELEASE] (302) chan-
ges 1--> 0. By means of this output the speed reference of ramp
generator input is connected to zero before acceleration starts and
after stop command is given.
Output LIFT BRAKE (10304) is used to open the mechanical brake
when the motor is able to produce torque (torque act = TREF
OUT).
Output BRAKE RUN (10305) is used for controlling one of input
signals RUN1, RUN2 or RUN3 in DRIVE LOGIC to give a RUN -
command for the converter.
Functional Software description
79