Installation and Commissioning

Troubleshooting Tools2.13 Encoder interface unit, DSQC354Status LED’sDigin 2Enc 2BEnc 2ADigin 1Enc 1BEnc 1ACAN RxCAN TxMSNSPOWERX20EncoderDSQC 354 ABB Flexible AutomationPOWERNSMSCAN TxCAN RxENC 1AENC 1BDIGIN 1X5X3Designation Colour Description/RemedyPOWER, 24 VDC Green Indicates that a supply voltage ispresent, and has a level above 12 VDC.If no light, check that voltage is present onpower unit. That power is present inconnector X20. If not, check cables andconnectors.If power is applied to unit butunit does not work, replace unit.NS/MS Green/red See section 2.14.CAN Tx/CAN Rx Yellow See section 2.14.ENC 1A/1B Green Indicates phase 1 and 2 from encoder.Flashes by each Encoder pulse.By frequencies higher than a few Hz,flashing can no longer be observed (lightwill appear weaker).If no light, faulty power supply for inputcircuit (internal or external). Defectiveinput circuit on board. External wiring orconnectors, short circuit or broken wire.Internal error in unit. Constant light indicates constant high level on input and viceversa. No light in one LED indicates faultin one encoder phase.Product Manual 25