Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

B–62755EN/019. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)Alarm No. Meanings Description RemedyAL–49AL–50AL–51AL–52AL–53AL–54AL–55The converted differentialspeed is too high.Excessive speedcommand calculationvalue in spindlesynchronization controlUndervoltage at DC linksectionITP signal abnormality IITP signal abnormality IIOverload current alarmPower line abnormality inspindle switching/outputswitchingDetects that difference between a spindlespeed and another spindle speed hasexceeded allowable limit in differentialspeed mode.Detects that speed command calculationvalue exceeded allowable range in spindlesynchronization control.Detects that DC power supply voltage ofpower circuit has dropped (due to momentarypower failure or loose contact of magneticcontactor).Detects abnormality in synchronization signal(ITP signal) with CNC (such as loss ofITP signal).Detects abnormality in synchronization signal(ITP signal) with CNC (such as loss ofITP signal).Detects that excessive current flowed inmotor for long time.Detects that switch request signal does notmatch power line status check signal.Calculate differential speed by multiplying speedof other spindle by gear ratio. Check ifcalculated value is not greater than maximumspeed of motor.Calculate motor speed by multiplying specifiedspindle speed by gear ratio. Check if calculatedvalue is not greater than maximum speed of motor.Correct cause, then reset alarm.Correct cause, then reset alarm.Correct cause, then reset alarm.Check if overload operation or frequentacceleration/deceleration is performed.Check operation of magnetic contractor forpower line switching.Check if power line status check signal isprocessed normally.391