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One thing could be that alarm 100 means PWE (parameter write enable) bit is set on?
Al.
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Gents,
We have recently acquired an old Daewoo Puma 4-3A with Fanuc OT. Was running fine till today when we attempted to replace worn keypad membrane sheet. The new membrane wasn't fitting well so we had to add selfadhesive spacers between membrane and pushbuttons. While checking of functioning of all keys (by consequential keying all one by one) the NC went on cycling (like some of buttons got jammed) that could not be reset from key pad and we switched the machine off. New powerup resulted in some error codes of velosity unit problems, that partially recovered by resetting of thermal relay. Remained errors are:
100
400 (overload)
The S0 LED on mother board is ON. NC does not accept any parameter change. Machine Ready pushbutton does not work (24V however goes to MRD line when depressed). The error list recommends to measure current of OM servo motor but motor cannot be run and is hold by brake. There is no 90VDC supply to release brake (its relay does not get 24VDC from NC). All voltages and fuses are OK. What it could be?
Thanks,
George
One thing could be that alarm 100 means PWE (parameter write enable) bit is set on?
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Yes Al, you're right, PWE is ON and manual says to set it to OFF. But we cannot change any parameter without turning it into MACHINE READY mode. CRT shows MACHINE NOT READY, pressing MR pushbutton gives no effect. What to do?Originally Posted by Al_The_Man
Thanks,
George
Did you go to the setting screen and try resetting the PWE?
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Did you go to the setting screen and try resetting the PWE?
Al.
Yes, we have tried all to change it, the error 100 can be eliminated but error 400 not. Upon energizing both errors appear again. We removed the velocity unit. Our investigation has resulted in finding tripped thermo relay in the Velocity Unit A06B-6047-H206, further check came out with finding one of transistor dead-short. We suspect this is Darlington type
transistor and we could not find data for this obsolete type T30LDZ41. It
has 0.2 ohms between two legs in either direction. The other one instaled
immediately after 3-phase bridge rectifier as pair for T30LDZ41 is MG15G1AL2
and we have no data for it as well. Also, there are four more large devices
on the same heatsink unknown to us a we want to check them for functioning. Perhaps these are thyristors. Another problem we have no component level schematics for whole unit and boards A20B-1000-0220/07B and A16B-1200-0230/07B.
The NC gives same error code with and without velocity control unit. MACHINE READY cannot be turned on.
Do you know where to get these transistors or at least schematics? Any advice?
Thanks and regards,
George
Yes, we tried everything, error 100 can be cancelled...till next poering up, The error 400 remaining.
Our investigation has resulted in finding tripped
thermorelay in the Velocity Unit A06B-6047-H206, further check came out with finding one of transistor dead-short. We suspect this is Darlington type
transistor and we could not find data for this obsolete type T30LDZ41. It
has 0.2 ohms between two legs in either direction. The other one instaled
immediately after 3-phase bridge rectifier as pair for T30LDZ41 is MG15G1AL2
and we have no data for it as well. Also, there are four more large devices
on the same heatsink unknown to us a we want to check them for functioning. Perhaps these are thyristors. Another problem we have no component level schematics for whole unit and boards A20B-1000-0220/07B and A16B-1200-0230/07B.
The NC gives same error code with and without velocity control unit. MACHINE READY cannot be turned on.
Do you know where from to get these transistors or at least schematics for VCU? Any advice?
Thanks and regards,
George
PS. The forum did not work from here for somewhile.
hi ,
are you guys sure you do not have a key stuck in on your membrane key pad , and if pwe is turn on and you are pressing the key pad ,maybe some prameter got change, also check this company in china for your transistor hkinventory.com . nakatome
Thanks for the chineese source. Meanwhile we detected that suspected transistor is actually 3-legs diode with two legs shorted internally. It is just packaged into same body as neighboring darlington transistor. It's fine now. The Darlington surge transistor still cannot be checked by a multimeter. The parts left to be checked are four darlington output transistor modules which also difficult to test. All other high power parts are OK.
I dont think the one of key stuck as we removed membrane after realising the problem. Will check again.
Thanks,
George
Latest update, Gents..
We have discovered that 100VAC is not supplied to the VC drive, this voltage
is switched off by an internal Daewoo relay that suppose to be keyed to the ground by MRY signal that comes from main board (M2 cable, leg 49). In fact it does not come from NC. We disconnected MRY wire from NC and keyed it forcely to GND, the hydro starts but servo is not, despite 100 VAC becomes available at its input. We believe it could be that servo also needs PRDY signal. It looks like if we simulate both MRY and PRDY simultaneously and servo starts, the problem is in NC main board. If not, the problem is in servo.
George
Gents,
Thanks everyone for help. Eventually we were able to reload lost and corrupted parameters and lathe works now almost as it worked before. No boards or drives had problems. Corruption happened due to many keys depressing followed by removing main board (suspected to fail) which caused loss of all parameters.
Hardest work was to push tool turret working properly as there no parameters for it. We understood it through learning ladder logic available in manual of Daewoo..
However, there is still problems with spindle indexing (did not work since beginning), we cannot (don't know how) index and clamp spindle and we have no documentation or parameters to get it working. The current situations is:
1. Controls 2AXIS-3AXIS SELECT, ORIENTATION, TOOL START, TOOL STOP, TOOL ROTARY DIRECTION, TOOL SPEED and four digit INDEX ANGLE LED are working.
2. Depressing ORIENTATION spinlde makes few turns, then it stops and clamps (brakes).
3. Empirically found that entering M17 acts as 2AXIS SELCT, M18 as 3AXIS SELECT, Depressing <3> results in lighting up LED indicator displaying 0000, entering of M19 causes in few turns of spindle without clamping and it looks like system waits for something to be completed.
4. We recall that before corruption work clamping/unclamping (jaws clamping, not spindle) was made by M10 and M11 while now these functions are made by M68 and M69, e.g. it looks like it is possible to allocate for every function a new command through changing some parameters. Is that correct?
Does any one know how to index spindle. Any sample program? Is there any M-code for spindle clamping (braking)?
Thanks in advance for any help.
George
(Fanuc OT, Daewoo Puma 4-3A lathe)
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