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802D - Interface Problems.. Please help

Created by: msb1 at: 8/9/2006 11:22 AM (4 Replies)

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8/9/2006 11:22 AM	Rate (0)
msb1 Posts: 7 Rating: (0)	Hello, We are facing the following problems with the 802D on our CNC turning centre. 1) When the constant cutting speed command (G96) is given with LIMS, it will not turn off with G97. Even if we specify a higher speed after the G97 command, the simdle will not go faster than what was earlier specified in G96. Program Example: G96 S150 LIMS=2500 ... G97 S3200 The spindle will not go above 2500 even after the G97 command. 2) The axis do not wait for the spindle to reach the desired speed and move before the spindle has fully accelerated. Program Example: G1 X70 Z 25 F0.25 S1500 M3 The axis movement starts immediately before the spindle has reached 1500 RPM. To overcome this problem we have to give a Dwell G4 before axis movement. --------------- I would greatly appreciate if someone can help with this as we are losing a lot of time and productivity due to these problems.
msb1 Posts: 7 Rating: (0)
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8/30/2006 4:53 PM	Rate (0)
Daniel (NL) Posts: 8 Rating: (0)	Dear sir, 1) on 840D following is defined for LIMS: LIMS is active for G96, G961 AND G97. As I expect 802D to behave same as 840D,this may explain your problem. On 840D there is an alternative G-code called G971, which is same as G97 but not influenced by LIMS. Maybe you can try this. 2) Machinedatum 35500 SPIND_ON_SPEED_AT_IPO_START is probably not set correctly and should be 1 (no feedmove) or 2 (no movement at all). Then feed movement can only start when spindle is upto speed. Machinedatum 35150 should be set to define the tolerance. I hope this help. Daniel Kofman Siemens Netherlands
Daniel (NL) Posts: 8 Rating: (0)
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8/31/2006 7:08 AM	Rate (0)
msb1 Posts: 7 Rating: (0)	Dear Sir, Thank you for your reply and for looking into this for us. We have overcome the G97 problem by simply adding another G96 with a LIMS of 3500 (machine max. speed) before the G97 code. This ensures the spindle will rotate at whatever speed set by G97. With regards to the machinedatum, the parameter for 35500 is already set at '1' for all axis and 35150 is set at "0.10" for all axis. So that is not the problem. Our machine manufacturer has asked us to add "G60" to the start of all programs to overcome this problem. Although this works, I'm sure there is a better, permanent solution to this. What is surprising is that neither the mahine manufacturer nor Siemens have been able to come up with a proper and permanent answer.
msb1 Posts: 7 Rating: (0)
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8/31/2006 3:31 PM	Rate (0)
Daniel (NL) Posts: 8 Rating: (0)	Dear sir, In 802D manuals I found LIMS is also active in G97 which seems to be in line with your findings. But it should be possible to program LIMS in one line with G97, ie. G97 LIMS=3500 S3500 With regards to the machinedatum, the parameter for 35500 is already set at '1' for all axis and 35150 is set at "0.10" for all axis. MD 35500 only works when there is a measured speed value from the spindle available, ie a spindle encoder. Otherwise MD35500 takes the programmedspeed as the actual speed and basically there is no monitoring. Also realize that setting MD35150 to 0,1 means that the actual speed may differ by 10% before feedmove can start, so with a programmed speed of 3000, the tool starts cutting at 2700 already. In case of questions, you can always try to use our support-request website: http://www.siemens.com/automation/support-request Which brand and type of machine are you using? Best reagrds Daniel Kofman Siemens Netherlands
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9/10/2006 9:17 AM	Rate (0)
msb1 Posts: 7 Rating: (0)	The machine I am using is made by Jyoti CNC in India. It is a turning centre - mode STC-200. Unfortunately, the support from the manufacturer has been virtually non-existent and documentation supplied by Siemens with the system is very poor. We have pretty much had t do all the trouble shooting ourselves with information available online. I don't think we will buy a machine with a Siemens controller again as they lack service support in India. Thank you for your assistance.
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