Posted on

6lowpan

what is lora

Have a question?

01522 740818

6Lowpan

What is 6lowpan?

The name 6LoWPAN comes from an acronym consisting of a combination of the  IPv6 Internet Protocol and also Low-power Wireless Personal Area Networks (LoWPAN). 

6lowpan is designed to allow the Internet Protocol to be wirelessly transmitted on small devices , which only have limited processing power.

Wireless IOT

Standard

Low Power Devices

Compatible


Contact Us

For more details visit our website: www.yesway.co.uk

Low Power Devices

Suspen disse males uada feugiat felis vel dignissim. Proin porta ultricies eros et iaculis

IIOT

Suitable for Low Power Industrial Internet Of Things Devices

long term battery life

Suitable for low power devices, that are optimised for low power consumption.

Integration

We can custom integrate 6Lowpan technology into existing or new products

Posted on

What is Lora

what is lora

Lora

LoRa is a spread spectrum wireless technology, developed by Semtech Corporation. It has been developed to allow long distance transmission of low rate data. The low rate data is collected by remote field sensors and actuators, and is used for Internet of Things and M2M applications. Lora uses the 868 Mhz unlicensed radio spectrum, in what is known as the ISM (Industrial, Scientific and Medical) bands to wirelessly facilitate low power, wide area data communication between the remote sensors and gateway devices, which connect to the Internet, or other network.

Posted on 1 Comment

Marine Induction Motor Servicing Tips

vocational training

Tips for Servicing Marine & Land Based Induction Motors.

Training Lincolnshire

Safety & Isolation of supply of induction motors.

Taking a casual approach to electricity can prove fatal.

This is especially true when we are talking about three-phase motors, as they operate in the UK & EU at 400 Volts Alternating Current (400 VAC).

Marine installations typically operate at an even higher 440 Volt Alternating Current (440 VAC).

Never work on a piece of three-phase machinery, such as an induction motor unless you are both qualified to do so, and have authorisation.

People able to give authorisation include senior managers, with appropriate responsibilities, in the case of onshore factory installations.

For work to be carried out aboard Ships, permission from someone such as the Chief Engineer is appropriate.

Once permission has been gained, and the appropriate paperwork issued, only then can work commence.

Certainly in the marine environment, and normally onshore as well, ‘locks and tags’ will be issued.

The lock is to ensure that once an isolator switch has been turned off, no one can switch it back on accidentally.

The ‘tag’ details who has isolated the supply, and is working on that circuit.

Only the person who has been issued with the lock and tag set, can remove them.

 

Double check that circuit is dead.

Don’t assume that just because you have locked and tagged the appropriate electrical isolator, that you are safe to work on a circuit.

The isolator may be incorrectly labeled, or even worse, you have taken someone else’s word for it.

Before you stick your fingers in, and potentially kill yourself, you need to use an appropriate device to check that the circuit is safe to work on.

induction motor bearing tips
Induction Motor

There are three possible devices that can be used:

  1. Test Bulb
  2. Multimeter / Voltmeter
  3. Line Tester

Firstly lets look at the test bulb as an option.

A test bulb with appropriate leads and clips attached, can provide indication of a live circuit, but has a flaw.

If the bulb filament breaks, then you could falsely assume that the circuit is safe to work on, with possibly fatal outcomes.

The second option is the Multimeter / Voltmeter which these days will probably be a ‘solid state’ digital type, rather than the older analogue types, which are commonly referred to as ‘AVO’s’ in the UK.

The Multimeter / Voltmeter being ‘solid state’ is more likely to be a bit more reliable than, a filament bulb tester. However it still may be broken, and you would not necessarily know. An example being the test probe wires may be ‘Open Circuit’.

The third option, the ‘Line Tester’, will provide the most reliable indication of whether a circuit is safe. Therefore this is the preferred option.

The reason that a line tester is safer is because it contains four separate Neon bulbs (some modern ones are LED).

The bulbs light up according to how high the voltage is, for example a 400 VAC supply would light not only the 400VAC light, but the lower voltage indicator lights as well.

So imagine that the 400VAC indicator bulb has broken.

The lower voltage indicator bulbs will still light up, for example the 230VAC and 110VAC indicator bulbs.

Therefore the engineer will still have an indication that there is voltage in the circuit, and can investigate further.

Before using a Line Tester you should use a ‘proving unit’. A proving unit is a small hand-held device capable of producing a voltage such as 250 Volts.

The Line tester can thus be tested using the proving unit, prior to testing a real live circuit.

To test the Line Tester the two probes are pushed against the Proving Unit which then produces a voltage.

This will be indicated by an indicator LED lighting up on the proving unit itself.

The Neon or Led indicator lamps of the Line Tester should also light up at the same time, to indicate the voltage being supplied.

 

Tips when changing bearings on Induction Motors

 

Importance of identification code facing outwards.

When refitting bearings to an induction motor you will notice that the bearing itself has a code written on the one side of it.

This code is the product identification code, and is what you need to quote in order to order the correct replacement bearing.

Once the correct replacement bearing has been obtained, and is ready for fitting, ensure the following.

Firstly, that the bearing identification code is facing away from the Stator, and outwards towards the end of the motor shaft.

This will help you in the future, if you ever have to replace the bearings again.

The reason for this is that you can just remove the end plate of the induction motor, and read the bearing code easily, provided it has been fitted with the code facing outwards.

If the bearing code was facing inwards, then it is harder to read the bearing code, and might mean that the motor shaft has to be disconnected from its mechanical load.

This adds to the motor downtime, and hence has financial and productivity implications.

 

Ways to remove bearings from induction motor shaft.

The ideal way to remove an old bearing from the induction motor rotor shaft is to use a bearing puller tool.

Removal is then just a matter of fitting, the tool into position, and winding in the screw thread in a clockwise direction.

As this happens, the bearing is slowly pulled up and off the shaft.

If however you don’t have a puller, other methods, such as  using a metal bar to leverage between the bearing and the end of the shaft can be tried.

However this is not the way I recommend, and you do it at you own risk of injury and damage to the motor shaft.

 

Methods for fitting a new induction motor bearing.

Ideally you will have a hydraulic bench press, that you can use to put massive pressure down onto the bearing to ‘press it’ onto the shaft, in the correct position.

When using such a press, a number of precautions should be observed.

Firstly, ensure that you are fully competent to use the hydraulic press. Even fairly cheap versions are capable of exerting many tons of pressure, which can be dangerous to human health.

Secondly, ensure that the tube or sleeve that you fit over the shaft of the motor is only just wide enough.

The reason for this is that a wide metal tube (or sleeve) put over the motor shaft in order to push against the bearing, can damage it.

This is because too wide a tube will make contact with the plastic middle of the bearing, or the outer metal edge.

Both of these two scenarios are bad, because pressure applied to anywhere but the centre metal part of the bearing, will cause damage.

This damage can result in the replacement bearing being ruined, which defeats the object of replacing it.

Using a hydraulic press is the method that we would recommend, however this option is sometimes not available.

In particular to engineers working at sea in a marine environment, such as a cargo ship.

If you find yourself in this situation, then there are other ways to re-fit a replacement bearing to an induction motor.

One method is to take advantage of the fact that metals contract and expand due to cold and heat.

This method involves carefully wrapping up the Stator part of the induction motor in a polythene bag, and putting it in the freezer overnight.

This will very slightly shrink the size diameter of the bearing shaft.

The second part to the operation involves gently heating up a pan of engine oil, so that it is warm.

Obviously extreme care needs to be taken, so that either a fire is not caused by the oil igniting, or the engineer receiving burns while trying to handle the hot bearing.

Once the bearing is warm, the Stator can be removed from the freezer, and the warm oiled bearing should slip fairly easily onto the shaft.

The oil can then be wiped off the bearing with a non fluffy cloth, and motor reassembly can begin.

 

[bctt tweet=”Tips when changing bearings on Induction Motors #training” username=”@acraigmiles”]

Save

Save

Save

Save

Save

Posted on Leave a comment

Problem solved for Lincoln Farmer with poor radio coverage

Recently we were contacted by a farmer, based just outside of the city of Lincoln, Lincolnshire.

He had had a system supplied and installed by another company a few years ago, however performance had decreased over time.

Our outstanding Yesway Engineer arrived on-site.

The first task was to carry out an audit of the installed equipment. This included performance tests of the installed radios to verify that the correct power output was being achieved from each radio. We also checked on air speech quality, and receive audio.

Once we were satisfied that the equipment was working properly (there is no point fitting a new aerial to a vehicle with a bust radio), we checked the aerial systems for forward and reflected power. This is done with a SWR (standing wave ratio) meter.

A number of the aerials fitted to the tractors and combine harvesters were in a poor state. Some whips were missing / damaged, while others were simply the wrong length.

The length of the aerial will vary depending on the frequency that the radio operates on.

The farmer had bought a replacement magmount aerial from a high street supplier, however these come ‘un-trimmed’. Therefore some of the power was being reflected back into the radio, and not going out into the ether (as it should).

This is why choosing an experienced company like Yesway, is always a great business strategy.

After trimming to the correct length, the output power increased. They also reduce the risk of radio equipment damage.

Posted on Leave a comment

Hired walkie talkies for upcoming theatre event in Yorkshire

theatre radios

Yesway Provide Walkie Talkies For Yorkshire Theatre Event

We have just agreed to hire 15 handheld walkie talkies for a local  outdoor theatre event in Yorkshire.

The event took place in east Yorkshire when this blog post was originally created in 2011, and was a great success

If you wish to hire handheld walkie talkies or need communications advice, then don’t hesitate to get in touch. Although I am based in Lincoln, I also cover Yorkshire.

To book two-way radio hire for your theatre or other event, call our friendly team on (01522) 740818.

Alternatively complete the enquiry box below, and we will be in touch as soon as possible.

Your Name (required)

Your Email (required)

Subject

Your Message

[recaptcha]

Posted on Leave a comment

Aerial spotting in Lincoln

what is lora

Aerial spotting

Recently we went aerial spotting  for communications aerials around Lincoln.

We cunningly disguised ourselves inside a number 15 bus, armed only with our eyes.

For those people who say that two way radio communications is a thing of the past, I have news for you.

There are many business radio antennas on chimneys and roofs, as well as on vehicles, proving that radio comms is alive and well.

Its not just two-way voice communications that is being transmitted, telemetry and the rapidly expanding Internet Of Things is resulting in an antenna increase.

Types of Aerial

Vehicle Aerials

Many of the latest vehicle antennas can be very discrete, so you have to keep you eyes peeled to spot them, and some re even deliberately designed not to be seen.

Probably the most common type you will see on a vehicle is the vertical dipole whip.

These ‘whip’ antennas (aerials) often are attached to a magnetic mount base, that can be easily attached to a metal vehicle roof.

This saves having to drill holes in the vehicle, which is less popular these days, as many business vehicles are now leased, rather than owned.

You may have noticed that the whip aerials on vehicles such as taxis, vary in length. This is due to resonant frequency.

For a transmitting antenna to work at maximum efficiency, it needs to be made for a specific resonant frequency.

Whip aerials on vehicles often come as a long length, which needs to be cut to the correct length.

Short Steel  Whip Aerials (around 15cm long) are operating in the UHF frequency band, roughly around 450Mhz (Mega Hertz).

Medium length Whip Aerials (around 45 cm) are probably operating in the VHF wave band, roughly around 160Mhz.

Long length steel whip aerials (typically around 91cm long) are either operating in VHF ‘Low Band’, around 77Mhz, or have not been cut to the correct resonant frequency .

One our aerial spotting trip, we saw many examples of both the medium and long length (VHF) aerials on taxis around Lincoln.

Yagi Aerials

A Yagi is a directional Aerial (Antenna) created by a Japanese inventor (hence the name).

This is probably the easiest and most common aerial that you will spot.

The Yagi aerial is most commonly used for television reception, and therefore most houses have one strapped to the chimney.

You may also have spotted Yagi antennas situated on land owned by water, gas and other utilities. These are used for sending and receiving telemetry.

The Yagi is a directional aerial, which makes it good at receiving and transmitting signals in one direction.

Therefore next time you spot a yagi, have a look at which way it is pointing. The way it is pointing will be the small end (away from the pole it is mounted on).

Other Types Of Aerial

There are  quite a few other types of Aerial, such as Co-Linear, Microwave  and Satellite Dishes, and we may extend this article to include them at a later time.  Alternatively for advice, contact us.

Aerial Coax

Aerials (Antennas) are connected to the radio receiving and transmitting equipment by a special cable, abbreviated to Coax.

Coax is short for Coaxial Cable, and is available in a number of types, suitable for different radio operating frequencies and applications.

Careful selection of the correct cable is crucial to ensure that your transmitter / receiver works well.

The use of an incorrect type of coax, can actually risk damaging transmitting equipment, as not all the RF power will travel up to the aerial (some will be reflected, back down, etc)

For help with radio communications in normal persons language, why not give the Yesway  team a ring!

(01522) 740818

 

 

(C) 2011-2018 Yesway Communications (Yesway Ltd)

Written by Craig Miles at Yesway Ltd https://www.linkedin.com/in/craig-miles/