297Moving objectsTroubles Causes MeasuresMarking cannot be done. Encoder signal is off. Check for proper connection to encoder.Marking is sometimesskipped.(E800 occurs.)Marking trigger signal is entered beforecurrent marking is finished.• Increase scan speed setting of laser marker.• Decrease delay distance setting of lasermarker.• Reduce feeder speed.• Increase marking interval (interval betweenobjects on feeder).Characters unreadableFeed direction is not correct. Match feed direction with laser marker operation.Speed changes at conveyor junction. If conveyors are coupled, avoid marking nearconveyor junction.Actual speed and preset speed forfeeding objects are different due toslippage of objects.Remove cause of object slippage.Pulse setting of encoder is not correct. Measure the number of encoder pulses andadjust “Number of encoder pulses”.Encoder is out of order. Check encoder for proper function.Marking position isunstable.Positional misalignment is likely tooccur due to meandering motion ofconveyor.Secure objects to prevent misalignment.Marking character pitchis unstable.The line speed at the marking positionis different from the speed at theinstallation site of the encoder.Place the encoder as close as possible to themarking position.Decrease the encoder resolution to block theeffect of the line speed fluctuation.Note that the minimum value of the encoder pulseshould be 10 P/mm.Character is partiallychipped. Obstacle hinders laser beam. Remove obstacle between head of laser markerand object.Actual spacing betweencharacters is larger orsmall than setting.Pulse setting of encoder is not correct.Check setting to be sure that:• When using A phase only:Number encoder pulses = Number of pulses/mm x 2• When using A and B phases:Number encoder pulses = Number of pulses/mm x 4Either A or B phase signal is refused. (Aand B phase used)Check that signal is applied to A and B phaseterminals of encoder.Measured number of encoder pulsesdiffers from calculated one.Increase or decrease values in “Encoder fineadjustment” field as appropriate.• When the character interval is wide:Increase the setting.• When the character interval is narrow:Decrease the setting.ME-LP400V-OP-6
