ABB DCS 500B Description

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ABB DCS 500B Description Manual pdf 87 page image

Functional Software descriptionDCS 500 Software Description 79TREF OUT TREF OUT (10301) is a output for torque reference which is usedwhen the brake is opened. This is normally connected to SPEEDCONTROL [BAL REF] (2009). This torque reference is set to in-tegral part of speed controller by means of TREF ENABLE outputTREF ENABLE Logical output TREF ENABLE (10302) is activated when theBR RELEASE changes 0 -->1 and is removed when STARTDELAY has elapsed.0 = TREF OUT (10301) is zero-1 = TREF OUT (10301) is used as torque referenceDECEL CMND Logical output DECEL CMND (10303) is used to control the speedreference. 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 rampgenerator input is connected to zero before acceleration starts andafter stop command is given.LIFT BRAKE Output LIFT BRAKE (10304) is used to open the mechanical brakewhen the motor is able to produce torque (torque act = TREFOUT).BRAKE RUN Output BRAKE RUN (10305) is used for controlling one of inputsignals RUN1, RUN2 or RUN3 in DRIVE LOGIC to give a RUN -command for the converter.