nord NORDAC START Series User Manual
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NORDAC START (SK 135E / SK 175E) – Users Manual for Motor Starters78 BU 0135 en-4118LED BR MeaningOFF No cyclic process data communication active, i.e. no data communication with slave.• PLC / Master in STOP or switched off• Missing 24 V DC voltage supply to motor starter• Profibus cable between PLC / Master and motor starter / Slave not connected• Connections not connected or exchanged• Bus terminating resistor not set correctly (at first and last slave of bus line)• Erroneous addressing (wrong address set)• Missing hardware configuration in PLC / Master, possible wrong GSD file(NORD0DA5.gsd) used (Link)green ON • Normal operation (cyclic process data communication in operation)4.4.3.3 ConfigurationProcess dataThe process data is used to control the motor starter and communicate its status. The transfer of thisdata is carried out cyclically. There is only one process data object (PDO) for the motor starter, with afixed data length of 1 byte. Only the bottom 4 bits are used. A distinction is made between the setpointPDO (from PLC to device (BUS-IN bits)) and the actual value PDO (from device to PLC (BUS-OUTbit)).Bus I/O bitsWARNING Unexpected movement due to automatic startingIn the event of a fault (communication interrupted or bus cable disconnection, the device automatically switchesoff, since the device enable is no longer present.Restoration of communication may result in an automatic start and therefore, unexpected movement of the driveunit. To prevent any hazard, a possible automatic start must be prevented as follows:• If a communication error occurs, the bus master must actively set the control bits to "zero".The device is equipped with two additional digital inputs for connecting initiators. However, there areno optional outputs for connecting actuators which are operated directly via the BUS. The followingconnections are each provided for four reference data bits:BUS-IN Function (P420[-04…-07])StatusStatusBit 1 Bit 0Bit 0 Enable right 0 0 Motor is switched offBit 1 Enable left 0 1 Field of rotation right present at motorBit 2 Acknowledge fault 1) 1 0 Field of rotation left present at motorBit 3 Release brake manually 2) 1 1 Motor is switched off1) Acknowledge with flank 0 1.For control via the bus, acknowledgement is notautomatically performed by a flank on one of theenable inputs2) 0 = Brake applied, will be released automatically ifrequired1 = Brake is released immediately. |
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