Hybrid View
-
02-12-2017 #1
Not a CNC problem, but hopeing someone can point me in the right direction.
This is an electrical drawing of my C3-31 Hammer (Felder) combination machine.
A few days ago it started tripping the MCB32A trip, which progressively got worse, on
any of the motors (Saw, planner, spindle moulder) until it would not work at all.
Suspected contactors, on enquiring with manufacturer was informed they only supply
complete enclosures A1 item 2 on drawing at £500.
So decided to purchase equivalent contactor and axillary contactor and fit.
Result was it would work if I unplugged the motor. (Contactor would pull in)
But if motors plunged in would sometimes work on Saw, but most of the time contactors "chattered"
some times holding in and sometimes tripping MCB332A trip.
The safety limits and stops are the same as a cnc machines so they should not be a problem.
I have tried bypassing the overload protection - no effect.
My suspicions are the braking circuit board, as I believe this works by injecting current back into
the motor to produce a magnetic field to stoop the motor quickly. Has this broken?
Causing some load to prevent the contactors working correctly?
Any help greatly appreciated before I fork out the £500.
Robert
-
02-12-2017 #2
Break the connection of the braking circuit to the motor and test.
Fault finding is a process of logical elimination, not speculation, the fact that multiple motors suffer the same issue suggests it isn't the motors but it can still be any other common component.
Are the motors single or 3 phase?
I'm sure it's clear on the schematic and DC injection braking is a 3-phase technique but you should post the schematic the right way up and at good resolution if you expect anyone to examine it closely, if you can't be bothered......... ;-)
Regards,
NickLast edited by magicniner; 02-12-2017 at 07:18 PM.
You think that's too expensive? You're not a Model Engineer are you? :D
-
02-12-2017 #3
It looks like it's 3 phase, I have a single phase version of this machine but it still has an electrical braking system.
Does it trip when you start a motor or when you press a stop button ?
It could be the rotary switch S7 (10), saw/moulder/planer, maybe it's losing a phase to the motors ?Last edited by EddyCurrent; 02-12-2017 at 08:41 PM.
Spelling mistakes are not intentional, I only seem to see them some time after I've posted
-
02-12-2017 #4
Drawing any better Nick?
Translation from German:
1 Home
2 Switching Unit
3 On Off Switch
4 Overload Protection
5 Contactor
6 Auxiliary Contactor
7 Braking Circuit
8 Transformer
9 Fuse
10 Selector Switch
11 Limit Switch
12 Emergency Stop
13 Emergency Stop
14 Motor – Saw
15 Motor – Spindle Moulder
16 Motor – Planer
17 Plug
18 Limit Switch
19 Limit Switch
20 Terminal Strip
Yes the motors are 3 phase run from a Transwave inverter.
So disconnect wire R7 from the contactor to eliminate the Braking circuit?
Does it trip when you start a motor or when you press a stop button ?
It trips or won't start when you press the start button. Contacts flash, chatter. But it does run on all three motors once it decides to hold the contacts in.
But I don't think the contactor will last long if I keep using it like this.
Thank you for your suggestions I will have another look at it tomorrow.
-
02-12-2017 #5
Is the coil voltage correct on your replacement contactor ? it shows 230v AC on the drawing, have you checked the voltage at the coil with a meter while it's chattering ?
Last edited by EddyCurrent; 02-12-2017 at 10:37 PM.
Spelling mistakes are not intentional, I only seem to see them some time after I've posted
-
02-12-2017 #6
Is the MCB332A which is tripping running the transwave and have you checked the output of the transwave as cack 3 phase into your machine will cause it to play up as various control bits are powered by single phases.
You think that's too expensive? You're not a Model Engineer are you? :D
-
03-12-2017 #7
Here is the replacement contactor details https://chaloncomponents.co.uk/produ...oltage=230v-ac
I will check while chattering.
Thread Information
Users Browsing this Thread
There are currently 5 users browsing this thread. (0 members and 5 guests)
Similar Threads
-
Finding spindle suppliers in UK
By freddi in forum Spindles & Drive MotorsReplies: 1Last Post: 07-02-2017, 08:16 PM -
combination machine.
By Popp Ann in forum 3D Printing MachinesReplies: 14Last Post: 23-02-2016, 10:35 AM -
eBay: Cutler and Hammer (vice?) foot pedal
By jamesgates1000 in forum Items On eBay UKReplies: 0Last Post: 20-10-2015, 07:33 AM -
Best CNC Software Combination
By Ricardoco in forum CAD & CAM SoftwareReplies: 12Last Post: 29-08-2011, 12:57 AM -
Edge Finding For Newbies
By M250cnc in forum CAD & CAM SoftwareReplies: 14Last Post: 01-03-2011, 10:55 AM
Bookmarks