ABB DCS 500B Description

Also see for DCS 500B: Operating instructions Service manual Service manual

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ABB DCS 500B Description Manual pdf 25 page image

Functional Software descriptionDCS 500 Software Description 17Opening Controlof the ContactorsIf the signal [ON/OFF] (901) changes from 1 to 0 (edge sensitive),the drive will block the controllers immediatelly and start a delaytime. Because of the regulator blocking the armature and field cur-rent will be forced to zero. When the delay time has elapsed theoutputs for handling the contactors will be set to 0; the contactorsshould drop off.This input has the second highest priority. The sequence describedbefore will be worked out independant from the drive condition(with / without speed; with / without armature current).In case of tripping, the fan, field and main contactors are opened ina certain order which depends on the type of the fault. Fault acti-vates the output FAULT (10904) to logical state 1.If a motor or converter overtemperature fault is detected, the out-puts for handling the cooling fans are kept high until the measuredtemperature has decreased below the alarm level.The drive will accept a reset-command, when the temperature hasdecreased below the fault level. In this case the outputs for the fancontactors will be reset.There are 3 different types of faults:- Faults which trip the main contactor:- Faults which trip main contactor and field contactor- Faults which trip main contactor, field contactor and fansfor more detailed information, please seemanual OPERATING INSTRUCTIONThe input START_INHIBIT] (908) has the highest priority. If thisinput is set to 1, the outputs for the handling of the contactors cannever be forced to level 1, if the drive is at standstill. If the drive isrunning and the input is set to 1, the drive will act in the same wayas if [ON/OFF] (901) is set to 0. Afterwards the drive cannot beswitched on as long as START_INHIBIT (908) has logic 1 level.When dynamic braking is used (output DYN BRAKE ON (10912)),an external resistor is connected in parallel with the armaturemodule. If the drive trips, the field of the motor must be maintained,otherwise the resistor cannot produce fast deceleration.Run Control When RDY RUNNING (10901) = 1, the drive can be started bysetting either input [RUN1] (901), [RUN2] (902) or [RUN3] (903) tostate 1. The drive releases the references and controllers and setsthe RUNNING (10903) signal to logical state 1. Another way tostart the drive is by Control Panel CDP312 in local mode using thestart button.