Remedy :
1. Check Hydaulic pressure should be 60 to 80 bar
2. Check clamp without tool X2.2 signal should not fluctuate
3. Check Tool clamp signal X2.3 should not fluctuate
4. Check Tool release signal X2.4 should not fluctuate
5. Point no 2,3 & 4 if occurred check its settings on OTT controller
6. Check spindle clamping force should be maintained
X2.2,X2.3 and X2.4 signals show in Picture above