Polar 115ED AC IN board blowing

Good morning all, I hope someone can help me as I have seen so much useful information on this site!

We have a Polar 115ED mach no. 6731648 that comes up with the errors "TIMEOUT MAIN DRIVE" along with faults 140 and 810.
AC In board connection was blown on pin 24, had it repaired and it blew again further down the line after a few days running! It has been repaired for a 3rd time now and blows instantly. Annoyingly I do not have any electrical drawings to see what pin 24 and fuse F11 are related too and what can be causing a big enough current to damage the pc board.

Any help with drawings or answers will be much appreciated.

Adam

 

Hi Adam,
Do you face this problem once the main switch is ON or when you switch ON main drive?

 

I cant tell you at what stage it is blowing as the board is off to be repaired yet again, however the main drive sounds and runs perfectly normal. First time we had the problem was on start up, the second time was half way through a knife strike. The machine will still boot up OK but will show the timeout main drive error on the polar mohr load screen

 

Hi sir;
Please proceed with this suggest fro error code 140+810 as indicated.
Let me know, another problem, or send me his email, i can not do it for Rules of Forum
140
This error message indicates that input signal "locking valve 25V" to board CPxx
has not been set, i.e. the 25-V voltage supply of locking valve Y315 must be
verified. On 78 ES, this error may be caused when the ıcomputer voltage is
dropping too fast.
Remedy: - Measure supply voltage of 25 Vd.c. for locking valve Y 315
- Check mechanically if locking valve is functioning
- Measure solenoid (9-22 ohms)
- Check / replace SK 95- board
- With ED machines AC-IN- board is defective
- With XT machines check / replace electric rectifier V2
- Check / replace CPxx- board
- Check fuse on DC board.
- Rectifier AC board
- Check DIP switch on CPxx- board.
- On 78ES: install capacitor with cable connection (048320).
- Check POLAR 78ES transformer and replace it, if necessary (plug 94).
- check CU 0 volts.
- CU plug SK6 pin7 missing / please check.
- CU plug SK 52 missing / please check.
- SKÜ check plug no. 6
- Check correct setting of DIP-switches on CPxx- board for POLAR 66
- Check impulse generator IG1 and it's cabling.
- Short circuit in cutting circuit transformer area. (Check cabling.)

810.

As of ED program version V 1.4 this error message is BACKGAUGE MOTOR
OVERHEATED! On drive units that employ frequency converters the thermocouple
of the backgauge motor shows an excessive operating temperature of the motor.
Remedy: - Check backgauge motor and thermocouple.
- Check driving mechanism, spindle and sledge guiding for stiffness.
- Check / replace SAP- board.
- Check adjustment of frequency converter.
- Check cabling / plug-in connections.
- Check voltage supply.
- With ED machines check / replace AC /AC -IN board

 

Thank you for your replies! We are using a borrowed AC IN board which has cured the problem, The original AC IN is off for repair again to a different board specialist for refurbishment.

Thank you!!

 

ok.

Great job Sir