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 73 page image

Functional Software descriptionDCS 500 Software Description 65• ProtectionsCONVERTER_PROTECTION function blockNetwork voltagemeasurementThe measurement/calculation of network voltage is based on thenominal voltage of the converter, nominal voltage of the supply andthe voltage measurement as follows:U NET ACT U U CONV VU SUPPLY e gmeasured( ) * ( )( ) . . * %10504 105115073276 500400 4095 100= = = =400 V supply Note. DCS 500B converter module is exactly the same for 400Vand 500V supply. Voltage measurement scaling is constant 500V =4095. U CONV V (10511) signal value must be 500 also for 400Vsupply (software reads this value automatically from the SDCS-PINxx board when C1, C2 or C3 modules are used).Network under-voltageThe nominal net voltage is defined in U SUPPLY (507). The upperlimit for network undervoltage is defined in % by parameter U NETMIN1 (508). If the network voltage drops below this limit, the con-trollers are blocked. An undervoltage trip is generated if networkvoltage is not restored within the time defined by parameter PWRDOWN TIME (510). Scaling 1 == 1 ms.The lower limit for network undervoltage is defined in % by pa-rameter U NET MIN2 (509). If the network voltage drops below thislimit, the drive is tripped immediately.Network over-voltageThe overvoltage limit is fixed to 130%. If this limit is exceeded, andthe situation continues for at least 10 seconds, anOVERVOLTAGE-fault will occur. Armature overvoltage level is de-fined in % of nominal voltage of motor by parameterARM OVERVOLT LEV (511).Overcurrent There is a fixed overcurrent limit for the converter, and this valuecan be read out from the signalI TRIP A (10510) (scale 1 = 1A)If there is a need to reduce this limit, it can be done with the pa-rameter:ARM OVERCURR LEV (512)scale: 100 = nominal current of converter I CONV A (10509).