6 -144 Zero-servo Function (SPEC: E or Later Only)The zero-servo function holds the motor when the motor is stopped in what is call a zero-servo status. Thisfunction can be used to stop the motor even with an external force acts on the motor or the analog referenceinput is offset.The zero-servo function is enabled when one of the multi-function inputs (H1-01 to H1-06) is set to 72 (zero-servo command). If the zero-servo command is ON when the frequency (speed) reference falls below the zero-speed level, a zero-servo status is implemented.Related ConstantsCon-stantNumberName Description SettingRangeFactorySettingChangeduringOpera-tionControl Methods MEMOBUSRegis-terV/fV/fwithPGOpenLoopVec-torFluxVec-torb2-01Zero-speedlevel (DCinjectionbraking start-ing fre-quency)Used to set the frequency whichstarts DC injection braking inunits of Hz when deceleration tostop is selected.When b2-01 is less than E1-09,E1-09 is used to set the startingfrequency for the DC injectionbraking.In flux vector control, b2-01 isused to set the starting frequencyfor the zero-speed control.0.0 to10.0 0.5 Hz No A A A A 189Hb9-01 Zero-servogainAdjust the strength of the zero-servo lock.Enabled when the “zero-servocommand” is set for the multi-function input. When the zero-servo command has been inputand the frequency referencedrop below excitation level (b2-01), a position control loop iscreated and the motor stops.Increasing the zero-servo gain inturn increases the strength of thelock. Increasing it by too muchwill cause oscillation.0 to 100 5 No No No No A 1DAHb9-02Zero-servocompletionwidthSets the output width of thezero-servo completion signal.Enabled when the “zero-servocompletion (end)” is set for amulti-function input. The zero-servo completion signal is ONwhen the current position iswithin the range (the zero-servostart position± zero-servo com-pletion width.)Set the allowable position dis-placement from the zero-servostart position to 4 times the pulserate of the PG (pulse generator,encoder) in use.0 to16383 10 No No No No A 1DBH
