Danfoss MCB 152 Operating Instructions Manual
Also see for VLT series: Service manualInstallation guideOperating instructionsService manualInstallation guide
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Contents
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3.2 Inputs and Output3.2.1 Permitted Sensor Types on DigitalInputsThe following list describes how digital inputs are activateddepending on sensor types:• NCNC: A digital input is active when there is 0 Vat both channels of the input.• Antivalent: A digital input is active only whenthere is 0 V at channel A and 24 V at channel B.• NC: The functionality is similar to NCNC.Sensors with 2 NO contacts are not applicable.The safe digital inputs are configured for both directlyconnected safety sensors, e.g. emergency stop controldevices or light curtains, as well as for pre-processingsafety relays, for example safe controls. See examples ofconnecting the safe digital input, in accordance with ENISO 13849-1 and EN IEC 62061 in chapter 8.1 ConnectingSafe Digital Inputs.3.2.2 InputsThe dual channel digital inputs are used to activate thesafety functions.1 or both digital inputs can be disabled.DI 1 can have 1 of the following functions:• STO: Safe Torque Off.• SO Mon: Safe option monitoring through the safefieldbus.DI 2 can have 1 of the following functions:• STO: Safe Torque Off.• SO Mon: Safe option monitoring.• Reset: Additional safe input to reset the safetyoption after an error, or after deactivating asafety function on input DI1.3.2.3 Safe Option Monitoring (SO Mon)The PLC can use the digital inputs of the safety option assafe inputs. If a digital input is set to Safe OptionMonitoring (SO Mon), the safety option maintains all signalchecks (discrepancy, etc.) on the digital inputs, but thesafety option does not activate safety functions in case ofa signal change. All safety logic is carried out by the PLC.3.2.4 OutputS37 is the safe, single-channel output that goes to the STOinput of the frequency converter. For information aboutthe events that trigger STO, see chapter 3.1.1 Safe TorqueOff - STO.3.2.5 Signal FilteringIf a sensor with NC-NC or antivalent is selected, the safetyoption checks the signals of the safe digital input forconsistency. If NC-NC is selected, consistent signals at bothinputs always assume the same signal state (high or low).If antivalent is selected, it checks the correct state of eachinput.With electromechanical sensors (for example emergencystop buttons or door switches), the 2 sensor contacts arenever activated at the same time due to discrepancy. Along-term discrepancy leads to a fault in the wiring of asafe input, for example, a wire break. An adjustable filter inthe safety option prevents errors caused by temporary orshort-term discrepancy. Within the filter tolerance time42-22 Discrepancy Time, the safety option suppresses thediscrepancy when monitoring the safe inputs.If the signals have different levels after the discrepancytime expires, the option responds with an external error.NOTICEThe discrepancy time does not extend the safety optionresponse time. The safety option activates its safetyfunction as soon as there is a signal transition on one ofthe 2 channels of a digital input.Functions Operating InstructionsMG37F102 Danfoss A/S © 10/2014 All rights reserved. 113 3 |
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