Cause Possible SolutionsUndervoltage was detected. • Check the drive input power voltage by looking at the DC bus voltage (U1-07).• Check all main circuit wiring.u Motor Does Not Rotate Properly after Pressing AUTO Button or after Entering ExternalRun Commandn Motor Does Not RotateCause Possible SolutionsThe drive is not in the Drive Mode. • Check if the DRV light on the HOA keypad is lit.• Enter the Drive Mode to begin operating the motor. Refer to The Drive and Programming Modes on page 99.HAND was pushed.Stop the drive and check if the correct frequency reference source is selected. If the operator keypad shall be thesource, the LO/RE button LED must be on. If the source is REMOTE, it must be off.Take the following steps to solve the problem:• Push HAND .Auto-Tuning has just completed.• When Auto-Tuning completes, the drive is switched back to the Programming Mode. The Run command willnot be accepted unless the drive is in the Drive Mode.• Use the HOA keypad to enter the Drive Mode. Refer to The Drive and Programming Modes on page 99.A Fast Stop was executed and hasnot yet been reset. Reset the Fast Stop command.Settings are incorrect for the sourcethat provides the Run command.Check parameter Z1-08 (Run Command Selection).Set Z1-08 so that it corresponds with the correct Run command source.0: HOA keypad1: Control circuit terminal (default setting)2: MEMOBUS/Modbus communications3: Option cardThere is faulty wiring in the controlcircuit terminals.• Check the wiring for the control terminal.• Correct wiring mistakes.• Check the input terminal status monitor (U1-10).The drive has been set to accept thefrequency reference from theincorrect source.Check parameter b1-01 (Frequency Reference Selection 1).Set b1-01 to the correct source of the frequency reference.0: HOA keypad1: Control circuit terminal (default setting)2: MEMOBUS/Modbus communications3: Option cardThe terminal set to accept the mainspeed reference is set to the incorrectvoltage and/or current.If the frequency reference is set at terminal A1, check parameter H3-01 for the correct signal level selection. Ifterminal A2 is used, check parameter H3-09. Refer to Input Signal Selection for Terminals A1 and A2 on page85.Selection for the sink/source modeand the internal/external powersupply is incorrect. Check wire jumper connection between terminals SC and SP.Frequency reference is too low. Check the frequency reference monitor (U1-01).Multi-function analog input is set upto accept gain for the frequencyreference, but no voltage (current)has been provided.• Check the multi-function analog input settings.• Check if analog inputs A1 or A2 are set for frequency reference gain (H3-02, H3-10 = 1). If so, check if thecorrect signal is applied to the terminal. The gain and the frequency reference will be 0 if no signal is applied tothe gain input.• Check if H3-02 and H3-10 have been set to the proper values.• Check if the analog input value has been set properly. (U1-13 and U1-14)OFF was pressed when thedrive was started from a REMOTEsource.• Pressing OFF will decelerate the drive to stop.• Switch off the Run command and then re-enter a new Run command.• Set o2-02 to 0 to disable OFF .Motor starting torque is too low. Refer to Motor Performance Fine-Tuning on page 224.Frequency reference value is too lowor the drive does not accept the valueentered. Enter a value that is above the minimum output frequency determined by E1-09.6.9 Troubleshooting without Fault DisplayYASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual 2596 Diagnostics &Troubleshooting
