Polar 115EL cutting problems

I greet you all.
Good to be with you.
I am new here.

Ours is a Polar 115EL s/nr. 69/3820.
The machine has changed hands many times. No manual.

Problem:-
Blade will not come down when the cutting buttons are pressed but the clamp do.

The hydraulic oil level at the sump is okey and we bled the system to remove air. No external oil leakage from anywhere.

The m/c was in use when this problem suddenly developed.

Any idea for a solution?

 

Hi sir:
Welcome to the Forum.

Please do this, supposing that you did the correct bleeding in many places of the machines,since you do not have tech instruction or documentations:

1) Test in the connectors: D35.1 +D34.3 for +24Vdc .

2) If there are: please go after you press the cut button b28a+b28b connector D34.8 If there are go to Pin 8/39=24Vdc (board # 8 pin 39) go Pin 8/30 or 8R2 =24vDC.

3) If there are go to measure : +42Vdc-50vDC in Pins a) 8/16= +42Vdc-50vDC b) 8/17 = ,+42Vdc-50vDC , this voltage is coming from Transformer M; for to feed Both solenoids ;M27A+M27B, Both control the Hydraulic Clamp + Clutch !

4) If the+24Vdc is NOT coming from D35.1 +D34.3 ,Please test the electronic board(power supply) #3 for +24Vdc ,receptacle for Test 3G2, see the fuse 4Amp.

5) Test the power supply board #2 ; Test receptacles: 2G1 +6Vdc +2G2 -6Vdc.

 

Thanks CHOCK for your response.

The m/c has only one solenoid at the hydraulic control yellow block and the voltage is present when the cutting button are pressed and at this point the clamp come down normally but the blade will not. The clamp returns when the switches are released.

With this I think (I may be wrong) for the clamp to respond to the command from the switches means the solenoid is actuated and the conditions for the interlocks in the circuits feeding the coil has been fulfilled.

One more observation. The pressure at the allen bolt on the the gear box when bleeding the hydraulic system for the clutch is low (i mean not spraying out as I expected). What is the normal.

Please note also in this polar 115EL 69/3820 model there are just relays and contactor many of them and not PCB modules at the electrical control panel.

Could you please assist by sending the sections of the drawing relevant for troubleshooting this problem.

Thanks again.

 

Sorry i did mistake with 115 CE+CS vs EL:

Follow this steps: attached is there the explanation

 

Previously the cutter was not always responding to both cutting buttons being pressed. We cleaned some contacts and it got better. Then the operator said it would work fine in the morning and gradually get worse as time passed He would turn it off and back on and that seemed to help. Now the cutter is not responsive at all when we press the 2 cutting buttons. Relay 90 engages when the buttons are pressed but none of the others. Also when we press 15b the air table comes on but does not stay on.

Previously when troubleshooting it would come on and stay on until one of the cutting buttons is pressed. Also at one point we pressed 21 and 22 and the bladed started cycling continuously if they were engaged. Now it won't even do that.

Any troubleshooting suggestions? We have lots of cutting to do and this is our only cutter. Hoping for a lifeline to save us.

 

Hi Sir: when you press the cut buttons, b 28a+ b 28b; the Relais D 21a+ D 21b, must pull in!!
However test : Regulated power Supply: -42V, if is coming to both Cut buttons!!!
Let me know

Blessings

 

Thank you for your reply. I have 48+V at the buttons. Which other relays start the cutting cycle? If I press 21a and 22b it will cut. After that randomly it will do another cut using the buttons but not always.

 

Dear Sir: is not + 42 is : -42Vdc, and then followed the -42 VDC, according with the Schematics;and see Where's the -42 VDC, is Missing!!, there will be some connector, bad contacts, loose wires, corroded, oxided, or Dry or Colder Solder joint!!!.

Blessings

 

I do not have a schematic so I don't know when the wires go. Which connector do I check in the back?