Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

YASKAWAMODE/SETCHARGEYASKAWA SERVOPACKDATA/POWER8.5 Operating Using Speed Control with Analog Reference8.5.4 Soft StartThe soft start function converts the stepwise speed reference inside the SERVOPACK to a consistent rate ofacceleration and deceleration.Pn305Soft Start Acceleration TimeSpeedPn306Setting Range Setting Unit Factory Setting Setting Validation0 to 10000 ms 0 ImmediatelySoft Start Deceleration TimeSpeedSetting Range Setting Unit Factory Setting Setting Validation0 to 10000 ms 0 ImmediatelyThe soft start function enables smooth speed control when inputting a stepwise speed reference or when selecting internallyset speeds. Set both Pn305 and Pn306 to “0” for normal speed control.Set these parameters as follows:• Pn305: The time interval from the time the motor starts until the motor maximum speed is reached.• Pn306: The time interval from the time the motor is operating at the motor maximum speed until it stops.Maximum speed of ServomotorBefore soft startAfter soft startPn305Pn3068.5.5 Speed Reference FilterPn307Speed Reference Filter Time ConstantSpeedSetting Range Setting Unit Factory Setting Setting Validation0 to 65535 0.01 ms 40 ImmediatelyThis smoothens the speed reference by applying a 1st-order delay filter to the analog speed reference (V-REF) input. Avalue that is too large, however, will slow down response.8.5.6 Using the Zero Clamp Function(1) Zero Clamp Function8Host controllerSpeed referenceV-REFWhen the /ZCLAMP signal is turned ON, aspeed reference below the Pn501 setting is detected.The zero clamp function is used for systems where the host controller does not form a position loop for the speedreference input. When the zero clamp signal (/ZCLAMP) is ON, a position loop is formed inside the SERVO-PACK as soon as the input voltage of the speed reference (V-REF) drops below the motor speed level in the zeroclamp level (Pn501). The servomotor ignores the speed reference and then quickly stops and locks the servomotor.The servomotor is clamped within ±1 pulse of when the zero clamp function is turned ON, and will still return tothe zero clamp position even if it is forcibly rotated by external force.SGDH-Zero clamp/P-CON(/ZCLAMP)Stops precisely!8-43