Descriptions of VACON® option boards vacon • 61Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/3OPTB8 accuracyThe following table represents the results of accuracy measurements in laboratory environment. Inthe tests we used Draga JAMAK cable. The testing covered different sensor setups.NOTE: Because of accuracy reasons OPTBH is recommended for newer installations. Please notethat using of OPTBH requires support from NX application.Connection of PT100 sensorsOne PT100-sensor can be connected to the first two inputs (terminals 1 to 3 and 4 to 6) and up tothree sensors to the third input (terminals 7 to 9). The sensors must be connected in series with atwo- or three-wire connection. See Chapter Jumper selections below.NOTE:• This expander board can be placed into four different slots on the control board. Therefore,the 'X' given in the Parameter reference must be replaced by the slot letter (B, C, D, or E)depending on the slot which the expander board is plugged into. See chapter 1.7.• Insulation level 4kV/sqrt(2) (DIN VDE 01 10-1). 2kV in sensor and 2kV in option board.10 NC Not connectedTable 29. PT100 accuracy for OPTB8Cable length (m) 3-wire 2-wire Accuracy (°C)300 x -20 < x < 8150 x -13 < x < 350 x -8 < x < 250 x -10 < x < 10Table 28. OPTB8 I/O terminalsTerminal Parameter referenceKeypad/NCDrive Technical informationR+RmR-R+R-R+RmR-R+R-3-wire connection 2-wire connectionConnection of one sensor3-wire connection 2-wire conne ctionConnection of several sensors7279.emf