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View Full Version : Problem Wiring schematics and user/maintenance/tech manual not provided.



dmannock
01-23-2016, 04:27 PM
I emailed the message below to Sunny Sun at Omni a couple of days ago and have had no response from him or Zach Sun. This Omni 1325 CNC router took 2 years to build and there were many games on his part that were caught every time. They refused to pay for the local fork lift delivery despite the shipping quote in the contract. This caused the shipper and the freight forwarder many problems and the latter even had difficulty finding trucking companies to deliver the crated machine from the port of Vancouver, BC to Edmonton, AB. It was another 'mistake/misunderstanding', yet Zach is online here as having organized such a service before. I have questioned Sunny about Zach's increasing lack of both technical knowledge and English skills (perhaps early onset dementia) and have suggested that he is not qualified to assemble a legally binding contract in a second language.

I did a lot of the work on the sourcing side of things and sorted out all of the UL/CSA parts and components. What Zach wanted was the sale and did not consider the minor changes to the standard machine. His attention was excellent before the deposit was paid, but poor afterwards. Two rebuilds of the control panel were necessary as Omni did not use all of the UL wire provided and did not even know the international wiring colour codes. As you will see in the email below, they now want to resist providing information for the end user.

Clearly they do not want to understand the fact that machines exported to foreign markets are governed by that countries regulations, not by the Chinese electrical codes. It is the suppliers responsibility, not the buyers and any North American distributors know this (They cannot legally resell without refitting the machine first and having it inspected.). Also, (worst case scenarios) if you buy a CE labelled machine from any Chinese company to import into North America, you risk having the machine seized as being non-compliant. Using a non-compliant machine in a commercial space is illegal (OK, it may look pretty, be well built and work perfectly for years, but you can not resell it without UL/CSA/ETL/TUV-R certification.) and potentially affects your liability if an accident occurs and your insurance company checks for the correct safety labels. They can legitimately refuse to pay up. This was confirmed by the Intertek inspection yesterday at my residence by the inspector who frequently listened to such arguments. Typically wire must be over-rated to 125% of the total current load in North America, but that message is largely ignored by the Chinese as smaller wire is cheaper. They expect you to change whatever is not up to code at your location whether or not you have provided the correct materials for the construction of the machine in China. I have taught Omni all I know on this UL/CSA topic and they are now making machines built to that standard. However, they are not alone in this. Two other factories from my reduced list of 3 are able to do this.

I asked for phone calls to be made to Sunny Sun by my provincial and federal government agencies. He also received a call from the Chinese embassy in Ottawa about this machine build some time ago. Zach definitely did not like me getting TTS Global to inspect the machine. Lying and cheating is an accepted part of life in Chinese society if it achieves the goal. My advice is to be careful every step of the way and cover absolutely everything in your contract with the company. The likelihood is that they will try to cut corners at every opportunity. Hence caveat emptor! David


Inspection result


People


David Mannock <dmannock@yahoo.com> (dmannock@yahoo.com)
Jan 22 at 3:26 PM

To

(omnisales1@omni-cnc.com)omnisales1@omni-cnc.com






Message body

Sunny, I have still not received the requested technical information from you or your customer service engineer. The inspection by Intertek (ETL) was generally good. The 20A CE fuses are not acceptable and the CE wiring with orange conductors was too small for the current load. In Canada the sizing of the conductors should be determined at 125% rated current loading. Zach has the ampacity tables for single and multiconductor wiring. I will have to replace this wiring with larger UL/CSA cable. I did provide Olflex 16AWG/4C for this purpose, but was told that it was too big, not flexible enough and lastly would not fit through the hole cut in the machine casting.


The cable to the mains supply must be armoured cable preferably coated. If laid across a floor, ramps must be used and they are available cheaply at discountramps.com for different cable diameters.


My calculations show the following current loads for my machine configuration: 4 * 7.6A (servo motors), 1 * 5.5A (stepper motor. Deduct 2 servo motors when in use.), 1 * 16A (spindle) = max 52A. I will have to use #6AWG cable between the control panel and the 60A fused disconnect switch.



For information purposes the wire sizes for machine services are the same as for a 1PH breaker/fuse panel for a house. My copy of the electrical code for Alberta (excludes BC and Ontario) dated 2012 states:


60A - 6AWG.

100A - 3AWG.
120A - 2AWG.

150A - 1/0AWG.

200A - 2/0AWG.


3PH may be slightly smaller.



Copies of the residential (volume 1) AND commercial/industrial (volume 2) guides are available at Electrical Code Simplified | PS Knight Co. Ltd. (http://psknight.com./)


They are cheap and in English.








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I suggest that you pass this information to your engineers and to the people at Surrey Plastics in BC for whom you are making a 1530 CNC router, which may need similar modifications if they have their machine inspected. Here 2h of Intertek inspection time costs ~$400CDN. In China, Intertek quoted me $1000 USD (This may apply to multiple machines of a similar design.).



On the final inspection the inspector wants to see the machine running and make sure that the emergency stop buttons work and that the interlocks on the control panel function properly. I hope this information helps you. I have also taken the liberty of attaching the technical notes for the 6-axis controller board used in this build as a pdf file. I would appreciate a copy of the wiring diagram and user/technical/maintenance manuals in return. David












Download (https://ca-mg6.mail.yahoo.com/neo/launch?.rand=62dl53gapmorn#)

CNC 6-axis board Omni1 .pdf