B8961 and B8962 User Manual22ENC Encoder ConfigurationEDIT SETUP ENC MODE - Axis One Enc Mode -fl· CLOSED LOOP ‚‡Encoder Mode [EM]Default: SERVO CLOSED LOOPThis option sets the encoder mode for each axis.The B8961 and B8962 servo position loops are closed by the DSP in the amplifier,freeing up the motion control board to do other processing.Therefore, you can runthe servo in either “open loop”or “servo closed loop”modes.This allows you toview (on the keypad display or via the PAn commands) either the commanded oractual position in user units.All programmed moves are based on the Motor/DriveResolution setting (D_RES).1. Use fl and ‡ keys to select an axis.2. Use the · and ‚ keys to scroll through the list of encoder modes and pressESC to select:Encoder Mode DescriptionOPEN LOOP The OPEN LOOP position will be displa yed on the keypad.OPEN-STALL The OPEN LOOP position will be displayed on the keypad but theencoder will be used for stall detection.CLOSED LOOP The encoder position is displayed on the keypad.All mo ves arebased on encoder position and stall detection is enabled.SERVO-CLOSED The encoder position is displayed on the keypad.All mo ves arebased on the commanded OPEN LOOP position and stall detectionis enabled.CLOSED LOOP PM The encoder position is displayed on the keypad.All mo ves arebased on encoder position,however, post move correction algo-rithms will keep the encoder position equal to the last commandedOPEN LOOP position. Following error is still active while in CLOSEDLOOP PM mode.A following er ror will occur when the number ofcorrection steps exceeds the following error value.This allows theSmartDrive to signal a fault when the displacement can not be cor-rected (i.e.the motor is stalled at an obstruction). Position mainte-nance will not attempt to correct position while navigating menuswith the keypad.Configuring Position Maintenance Deadband [IR]Default: 25 motor stepsRange: 0 - 99999Position maintenance deadband is a user definable region surrounding the com-manded position in which the motor shaft can reside and not be considered “out ofposition”.A displacement position exceeding the last commanded position +/- thedeadband value,will cause position maintenance to attempt to correct the position.1. Use fl and ‡ keys to select an axis.2. Use numeric keys to enter a new deadband value and press ENTER then ESCto register.EDIT > SETUP > ENC > IN-RANGE > WINDOW - Axis One PM DeadBnd -fl· 25 Steps ‚‡