Lenze AC Tech PositionServo 941 - Troubleshooting

S94P01C -e1
70
10 Troubleshooting
DANGER!
Hazard of electrical shock! Circuit potentials are up to 480 VAC above
earth ground. Avoid direct contact with the printed circuit board or
with circuit elements to prevent the risk of serious injury or fatality.
Disconnect incoming power and wait at least 60 seconds before
servicing drive. Capacitors retain charge after power is removed.
Before troubleshooting
Perform the following steps before starting any procedure in this section:
• Disconnect AC or DC voltage input from the PositionServo. Wait at least 60
seconds for the power to discharge.
• Check the PositionServo closely for damaged components.
• Check that no foreign material has become lodged on, or fallen into, the PositionServo.
• Verify that every connection is correct and in good condition.
• Verify that there are no short circuits or grounded connections.
• Check that the drive’s rated phase current and RMS voltage are consistent with
the motor ratings.
For additional assistance, contact your local PositionServo® authorized distributor.
Problem
External line fuse blows
Possible Cause
Line fuses are the wrong size
Motor leads or incoming power leads are shorted to ground.
Nuisance tripping caused by EMI noise spikes caused by poor
grounding and/or shielding.
Suggested Solution
• Check that line fuses are properly sized for the motor being used.
• Check motor cable and incoming power for shorts.
• Check that you follow recommendation for shielding and grounding
listed in section “shielding and grounding” early in this manual.
Problem
Ready LED is on but motor does not run.
Suggested Solution
If in torque or velocity mode:
Reference voltage input signal is not applied.
ReferencesignalisnotconnectedtothePositionServoinput
properly;connectionsareopen.
InMotionViewprogramcheck<Parameters><Reference>set
to<External>
For Velocity mode only:
InMotionViewcheck<Parameters><Compensation><Velocity
looplter>P-gainmustbesettovaluemorethen0inorderto
run.WithoutloadmotorwillrunwithP-gainsetaslowas20but
underloadmightnot.IfP-gainissetto0motorwillnotrunatall.
In position mode with master encoder motion source (no program)
Referencevoltageinputsignalsourceisnotproperlyselected.
InMotionViewprogramcheck<Parameters><Reference>set
to<External>
In position mode using indexing program
VariablesACCEL,DECEL,MAXV,UNITSarenotsetorsetto
0.Beforeattemptingthemovesetvaluesofmotionparameters
ACCEL,DECEL,MAXV,UNITS
Problem
In velocity mode, the motor runs away.
Possible Cause
• Hall sensors or encoder mis-wired.
• PositionServo not programmed for motor connected.
Suggested Solution
• Check Hall sensor and encoder connections.
• Check that the proper motor is selected..