|Symptom||Possible Cause||Corrective Action|
Alarm 4.992 S (SPINDLE) AMPLIFIER OVER CURRENT
VFD Drive Error Code: SF1 Motor Short Circuit
|Short-circuit or grounding at the drive output.||Refer to the VFD User Manual for the manufactures recommendations: Schneider Altivar 12 Users Manual|
|As the spindle comes to a stop it starts spinning in the opposite direction. VFD display will flash and show outputs of 7Hz to 11Hz.||Incorrect parameters in VFD.||
Correct the parameters. This only applies to Schneider VFDs.
When the machine is on the VFD screen will show "rdy". The VFD has a rotating button for menu navigation. Press the button to enter the menu system. Rotate the button to change your selection and press the button to confirm it. Use the ESC button to move back up the menu tree.
1. Change the motor control type was PErF “Performance” to Std “Standard”.
On the VFD select COnF -> FULL -> drC -> Ctt -> Std
2. Change to DC injection from Yes to No.
On the VFD select COnF -> FULL -> FUn -> AdC -> AdC -> nO
3. Change deceleration from 1 sec to 1.5 sec.
On the VFD select COnF -> dEC -> set to 1.5
|When trying to run the spindle at 10k rpm or higher, the VFD displays the error OCF (overcurrent), and alarms 4.9920 S (Spindle) Position Error too Large and 9146 Tabletop Driver Fault are generated on the NGC control.||Incorrect parameters in VFD.||
Change the Nominal Motor Speed.
ConF -> FULL -> drC -> nSP -> set value to “21.00” which represents 21000. (press down on the JOG Dial to confirm the value)
This only applies to 120V Schneider VFDs.
|Alarm 4.9920 S (Spindle) Position Error too Large is generated on start up and the alarm is resettable.||Software Error
||Press the [RESET] button. Desktop Mill can then be used as normal.|