YASKAWA A1000 Technical Manual

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Contents

oL4Overtorque Detection 2The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowabletime (L6-06).oL5 Mechanical Weakening Detection 1Overtorque occurred, matching the conditions specified in L6-08.oL7 High Slip Braking oLThe output frequency stayed constant for longer than the time set in n3-04 during High Slip Braking.oPrExternal Digital Operator Connection FaultThe external operator has been disconnected from the drive.Note: An oPr fault will occur when all of the following conditions are true:• Output is interrupted when the operator is disconnected (o2-06 = 1).• The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).oS Overspeed (for Control Mode with PG)The motor speed feedback exceeded the F1-08 setting.ovOvervoltageVoltage in the DC bus has exceeded the overvoltage detection level.• For 200 V class drives: approximately 410 V• For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400)• For 600 V class drives: approximately 1040 VCause Possible SolutionDeceleration time is too short and regenerativeenergy is flowing from the motor into the drive• Increase the deceleration time (C1-02, C1-04, C1-06, C1-08).• Install a dynamic braking resistor or a dynamic braking resistor unit.• Enable stall prevention during deceleration (L3-04 = 1). Stall Prevention is enabled as the defaultsetting.Fast acceleration time causes the motor toovershoot the speed reference• Check if sudden drive acceleration triggers an overvoltage alarm.• Increase the acceleration time.• Use longer S-curve acceleration and deceleration times.• Enable the Overvoltage Suppression function (L3-11 = 1).• Lengthen the S-curve at acceleration end.Excessive braking load The braking torque was too high, causing regenerative energy to charge the DC bus. Reduce the brakingtorque, use a dynamic braking option, or lengthen decel time.Surge voltage entering from the drive inputpowerInstall a DC reactor.Note: Voltage surge can result from a thyristor convertor and phase advancing capacitor using thesame input power supply.Ground fault in the output circuit causes theDC bus capacitor to overcharge• Check the motor wiring for ground faults.• Correct grounding shorts and turn the power back on.Improper Setting of Speed Search relatedparameters (including Speed Search after amomentary power loss and after a fault restart)• Check the settings for Speed Search-related parameters.• Enable Speed Search restart function (b3-19 greater than or equal to 1 to 10).• Adjust the current level during Speed Search and the deceleration time (b3-02 and b3-03 respectively).• Perform Stationary Auto-Tuning for line-to-line resistance and then enable Speed Estimation SpeedSearch (b3-24 = 1).Drive input power voltage is too high • Check the voltage.• Lower drive input power voltage within the limits listed in the specifications.The braking transistor or braking resistor arewired incorrectly• Check braking transistor and braking resistor wiring for errors.• Properly rewire the braking resistor device.PG cable is disconnected Reconnect the cable.PG cable wiring is wrong Correct the wiring.Noise interference along the PG encoderwiring Separate the wiring from the source of the noise (often the output lines from the drive).Drive fails to operate properly due to noiseinterference• Review the list of possible solutions provided for controlling noise.• Review the section on handling noise interference and check the control circuit lines, main circuit lines,and ground wiring.Load inertia has been set incorrectly• Check the load inertia settings when using KEB, overvoltage suppression, or Stall Prevention duringdeceleration.• Adjust the load inertia ratio in L3-25 to better match the load.Braking function is being used in OLV/PM Connect a braking resistor.5.2 Fault Detection136 YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide