Polar 78EX

Dear All,
My polar 78EX shows fault message (locking valve 25v faulty),could you please advise the cause of problem.

Best regards,
Tariq

 

Sorry it's 78ES

 

Hi tariq
This error message indicates that input signal "locking valve 25V" to board CP
has not been set. the 25-V voltage supply of locking valve Y315 must be
verified
this error also may be caused when the computer voltage is dropping too fast.
- 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 fuse on DC board.
- Rectifier AC board
- Check transformer and replace it, if necessary (plug 94).
- Check correct setting of DIP-switches on CP board must be on ES
- Short circuit in cutting circuit transformer area. (Check cabling.)
Good luck and let me know

 

Hydraulic can be a Problem as well. Check the oil level.

 

I found the problem... damaged rectifier which is responsible for supply the valves,thank you.

 

Good job .
Be welcome