Code SVGN-020: Pressure shortage%d: Gun%d

Cause: The SPOT, PRESS_MOTN or TIPDRESS, instruction failed because gun closure was not detected(1) or gun pressure was unstable(2). The number after pressure shortage (1 or 2) identifies the failure type. Scan the list below for the cause that most nearly matches the condition at hand, then refer to the remedy for that cause. Shortage 1) The instruction completed - gun tip moved to the pushing depth position - without torque increasing to the gun close detection value (1/2 Std Overtorque Value). z 1A) If gun moved to current close axis limit without achieving pressure, then axis limit is too small. If stroke limit is decreased, push depth is too small to achieve pressure. Push depth status can be confirmed SVGN-158 as cause code. SVGN-158 shows current available push depth and maximum push depth. When available push depth is too smaller than max push depth, it shows current stroke limit is too small than one of the new tip. z 1B) Pushing depth parameter in pressure schedule is not large enough to overcome gun bending at target pressure plus tip wear amount since last measurement. z 1C) Part thickness parameter (Thk from SVGN-158) is much larger than actual part thickness z 1D) Gun zero master position is incorrect (if tips are worn and user chooses to not use tip wear comp, then start with 1B) z 1E) Gun close detection torque may be excessive (or larger than Max Motor torque) due to a large restriction in gun mechanism. Shortage 2) The torque for pressuring varied from the target value. There are (2) likely causes: z 2A) Target pressure is at very low or high end of gun operating range (tips are likely touching part) z 2B) Friction in gun mechanism has increased considerably since gun was autotuned (tips are likely NOT touching part) Remedy: Shortage 1) z 1A) When tip wear compensation is used, close axis limit is adjusted to avoid over-stroking gun (ClosLim becomes smaller than StdLim when caps are worn). To extend axis limit, change tips, then run tip wear comp update program when using tip wear comp. Next, check the original close limit (StdLim) setting on servo gun setup screen and adjust if not correct. z 1B) Increase pushing depth in pressure schedule (set $sgsyscfg.$sho_pshdpth=TRUE to see pushing depth parameter) z 1C) Reduce part thickness in the pressure schedule so it is closer to actual part thickness. z 1D) If using tip wear compensation, re-master the gun by running the tip wear compensation update program. Otherwise, refer to 1B or re-master the gun with new tips from the gun master screen. z 1E) Adjust the gun mechanism to relieve the restriction. Re-tune the gun (autotune) and calibrate pressure after adjustment. Shortage 2) z 2A) Re-tune the gun (autotune) then confirm pressure calibration. If problem persists, or if the alarm occurs during tip wear measurement, autotune with Initial Filter set to a value between 10-30. To see Initial Filter item, set $sgsyscfg.$sho_atn_cfg=TRUE then press enter on Auto Tune item from Gun Setup Utility before tuning. z 2B) Re-tune the gun (autotune) to adjust the gun close detection limit, then confirm pressure calibration. If required, adjust the gun mechanism to relieve the cause of friction increase.