38Installation and ConnectionTechnical DataInput resistance: 120 OhmProcess data channel: 1VppParameter channel: EIA RS485 half duplexMaximum input frequency: 200 kHzEncoder line number: 1024 incMaximum cable length: <100 m (based on signal levels, otherwise see below)Cable length based on cable resistanceThe maximum cable length is calculated as follows:Length = V - Vmin = 7.5V - 7.0 = 35.7 mImax * R 0.2A * 0.07 W/mwhereImax = supply current of encoder [amps]V = voltage supply of the drive = 7.5VVmin = minimum supply voltage of the encoderR = cable resistance (0.07 W/m) for KEB cables)The following Hiperface®-encoders have been tested for use:• Stegmann SRS 50/60 Singleturn; SCS 60/70 Singleturn• Stegmann SRM 50/60 Multiturn; SCM 60/70 MultiturnHowever, this does not restrict the use of rotary encoder with samespecifications of other manufacturersRecognition of encoder loss or exchangeThe recognition of encoder loss or exchange is a software functionand dependent on the encoder type. If the drive senses that the serialcommunication to the encoder has stopped, it will trigger the errorE.ENCC.If the encoder is replaced or disconnected, the drive will trigger anerror or warning that the encoder was changed. The drive will displaythe error message E.ENCC and lock out operation by changing LF.3to configuration mode. No further operation is possible.If the encoder was exchanged the drive will auto reset the E.ENCCfault but will remain in configuration mode because the user will needto learn the new encoder position before operation can continue. Seesection 5.11.1If there is an encoder triggered fault or problems with the encodercables, the E.ENCC error will not clear and the problems must bediagnosed through parameter LF.26. To clear the E.ENCC error, it isnecessary to go to parameter 0.LF.26, press "Func" and then press"Enter".
