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Wet Induction Motor Symptoms

Induction Motor

Pouring water on an Induction Motor may stop it working.

This is due to the lowering of the insulation resistance of the internal motor coil windings, but what are the wet induction motor symptoms.

The coil windings are located inside the metal case of the induction motor, and are what generates a magnetic field, which makes the motor turn.

This article will focus on what are known as ‘three phase’ Induction Motors, which have three sets of coil windings inside the motor.

The internal motor windings are wound together in a component known as a ‘Stator’.

Each winding is electrically separated by an insulation layer on the copper wire that makes up a stator winding.

Therefore there should be a high level of electrical resistance between each of the three coils.

This ‘Insulation Resistance’ is typically above 2 Mega Ohms in a correctly operating Induction Motor, however for marine Induction motors 0.5 Mega Ohms is the stated (Solas) minimum.

If the coil windings become wet, then the insulation resistance would drop to a low level, which would prevent the motor from operating, due to a short circuit between the coil windings.

The good news is that induction motors can usually be dried out, and therefore returned to having a high insulation resistance between the Stator coils.

Methods for drying out the stator coils to restore an acceptable insulation resistance include hot air, or heating the coil windings using a welding set.

It is of course vital that the motor is disconnected from the electricity supply, and that only a qualified person carries out the work.

On land based industrial installations a damp or wet  Induction Motor, should trip the safety circuit breakers (RCD), and isolate the supply.

This is because on land, the priority is to safeguard the safety of people and livestock.

On board ships and Super-yachts however, the priority is to maintain the ships important systems, such as Steering gear.

Therefore ships electrical systems are designed to tolerate a single earth fault, without shutting down the whole circuit.

A wet Induction Motor would cause an earth fault to be detected by the ships ‘fault panel’, but not trip the whole circuit.

Yesway has experience of working on Marine Induction motors, and years of related experience.

Monitoring Using Radio Communications

Radio communications technology can be used to monitor the condition of induction motors.

Sensors can be attached or even integrated into induction motors, to monitor motor conditions.

Induction motor parameters that can be monitored by sensors are:

Phase Current

Motor speed RPM



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Tip for cleaning Charger connections

photo of charger connections

Tip for cleaning  Dirty Battery Charger Connections

Dirty battery charger connections can prevent the battery from charging. This article provides a secret industry tip for cleaning charger connections.

A customer in the Northern City of Hull, in the UK was having problems with his six-way multi charger.

The issue was not a fault with the charger, but due to the contacts that form the charger connections.

The problems was both on the battery and the charger battery contacts, which had becoming dirty.

Charger connections on battery
Tip for cleaning  Battery Charger connections

Over time the copper contacts on both the battery and the charger, which need to be clean, become dirty.

This is particularly an issue in harsh industrial environments, and can be a cause of the radio charger appearing to have a fault, when the radio is placed into it to charge.

A tip is to regularly clean both the copper contacts at the base of the rechargeable battery (on the back of the radio), and also lightly clean the spring contacts on the charger.

Ensure that the charger is switched off and disconnected from the mains power supply.

Then using a soft pencil eraser (rubber), gently rub the copper contacts to clean them.

This will help make electrical contact between the charger and the radio battery.

Why have the connections become dirty?

Air contaminants such as industrial dust, or corrosive atmospheres such as the marine industry, cause a build up of dirt or corrosion on the electrical contacts.

Preventative Maintenance of battery Connections

To prevent the inconvenience of your radios suffering this charging fault, regular cleaning and inspection of the battery and charger contacts is advised by Yesway.

For light manufacturing environments, once a month will normally be sufficient.

For heavy industrial and marine offshore environments, a weekly check and a quick clean is advised.

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what is lora

Have a question?

01522 740818


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


Low Power Devices


Contact Us

For more details visit our website:

Low Power Devices

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


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.


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

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What is Lora

what is 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.

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Fuses in Radio Equipment power Supplies

taxi radio faults

The importance of fuses in radio equipment power supplies

A safe two-way radio equipment installation requires the ability to quickly disconnect the supply to the equipment, if a fault develops. Fuses are a cost effective solution, for equipment safety.

What are Electrical Fuses

Fuses are devices that protect equipment installations, from excess electrical current.

Excess current is caused by a fault in the equipment, or system wiring, and can cause equipment damage, or even fire.

The fuse works by ‘blowing’ if a certain current through it is exceeded. When the fuse ‘blows’, the electrical current ceases to flow, due to a physical break inside the fuse, preventing current flow through it.

Types of Fuses

Electrical fuses come in a variety of package types, and current ratings.

For example, package types include ‘cartridge’ and ‘blade’ designs.

Fuses are also made to blow at different current thresholds, so can be matched to the piece of equipment it is connected to.

There are also fuse types known as ‘slow blow’ fuses.

Slow Blow fuses are designed not to blow due to a short spike in electrical current. Short spikes can be caused by surge currents, which is a very temporary increase in current, when a piece of equipment is started.

Importance of correct Fuses

Fitting an incorrect fuse can either reduce safety, or reliability.

For example, if a fuse is fitted that has too high a current blow rating, then if a fault develops with the equipment, the electricity will find another weak point in the system. This weak point could be the radio equipment itself, and the excess current could damage it.

On the other hand, fitting a fuse that has too small a current rating will reduce system reliability.

This is because the current being drawn by the radio equipment is more than the fuse can cope with, and therefore will blow.

Two way radio equipment, draws less current when receiving, than when it is transmitting. Therefore the fitting of a too small fuse, may not become apparent, until the two way radio transmits.

Always refer to the manufacturers equipment specifications to understand the maximum current that the equipment will draw, and select a fuse slightly larger.

If no manufacturers data is available, then using an Ammeter in series with the DC supply, can determine the current drawn. Remember however, to also test on transmit, and with maximum transmit power selected (if an option).

(c) 2018 Craig Miles / Yesway Ltd.

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Smart Environment


Smart Environment

The ‘Smart Environment’ means the use of low power wireless sensors to detect changing variables in the environment.

There are three distinct stages of a Smart Environment system, which will be considered in terms of INPUT-PROCESS-OUTPUT.

The input stage is concerned with the gathering of the data source, and getting it to the process part of the system.

In terms of a typical LPWAN, or Low Power Wide Area Network system this might consist of a ‘sensor node’ that measures an environmental parameter, such as the ‘Ph’ of the soil in a field.

The sensor node gathers data and the data is transmitted via a suitable Low Power, Narrow Bandwidth wireless technology, such as Lorawan, Weightless or Sigfox.

At the receiving end of the transmitted data, the data is received by a device called a ‘Gateway’. The job of the gateway is to receive the wireless data signal, and put it onto the internet.

The sensor node, Narrow band Wireless Link, and Gateway device, can all be considered to be part of the INPUT section of the system.

The PROCESS part of the system occurs online, and is where software can be used to make smart automated decisions relating to the environment, based on analysis of the available data received from the INPUT section of the system.

An example of an automated decision, might be a vending machine that sends data onto the internet reporting that the machine is out of salt and vinegar crisps.

The online software would then logically decide a course of action, based on the received data. This is the PROCESS section, capable of automatically carrying out decisions that are normally done by human beings (clerical workers).

The OUTPUT section carries out an instruction, based on the decisions made by the online software, in the cloud, which is based on data from the INPUT section.

In this vending machine example the received data could notify a mobile delivery driver on a screen in his vehicle, to go to the machine and restock it (with salt and vinegar crisps, in this case).

The system could also automatically order new stock, as and when necessary from the crisp manufacturer.

Parameters that could also be monitored and analysed are, which products are the most popular, and if data is sent in real time, what products sell at what time of the day.

Knowing the time of day that a product sells can help marketing departments determine the socio-economic & demographic profiles of users,

How could marketers use this information you might wonder?

If the vending machine was located at a swimming pool, then data from the swimming pools website on class times, could be combined with product purchase data from the vending machine at the pool, to determine what products were most popular when the ‘Women Only’ swim session was on for instance.

Another possible data source could include ticket type sold (adult, child, senior citizen).



Some other uses of Smart Environment systems include the following examples:-

  • Forest fire detection
  • Early detection of earthquakes
  • Remote Snow level monitoring
  • Air pollution monitoring
  • Landslide & Avalanche protection

This article will be expanded shortly, when we get some more time.

If you would like help with any of the above technologies, get in touch. We are multi-skilled engineers with experience in the marine, land industrial & aerospace industries.

[bctt tweet=”The ‘Smart Environment’ means the use of low power wireless sensors to detect changing variables in the environment” username=”yeswaylimited”]


Author Twitter Name: @acraigmiles



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Wireless Smart Cities

smart cities

Things that the Internet of Things can measure around future  ‘Wireless Smart Cities’ using low power wireless sensors:-

  • Waste Management
  • Wireless Smart Roads
  • Smart Parking, ensuring best use of limited space.
  • Structural Health, such as changes in length of bridge wires on a suspension bridge.
  • Mapping Urban Noise pollution. This affects human quality of life, and can affect wildlife as well
  • Smartphone detection.
  • Electromagnetic Field Levels, caused by power lines, radio transmitters etc.
  • Traffic congestion. Smarter traffic management solutions, based on real time data.
  • Smart lighting, such as street lights that go off and one depending on whether they are actually needed at the time.

Smart cities
smart cities


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Retrofitting the Internet of Things to Industry


Things to Consider When Retrofitting the Internet of Things to Existing Industrial Equipment


The Internet of Things, or IOT for short is already known to the public through innovative products, such as body worn fitness monitors, that record and upload data to the internet.

In the industrial sectors, such as manufacturing, new systems are being developed to replace existing infrastructure, to improve efficiency.

However, what about perfectly good existing equipment that you, as a business, do not want to replace. The answer is to retrofit equipment, to make it ‘Smart’.

It is convenient to break down the IOT process in terms of:-




Therefore retrofitting the Internet of Things….tb continued



This is the first of our videos on retrofitting the Internet of Things to existing industries, such as factories, agriculture and cities.

Internet of Things
Retrofitting the Internet of Things to Industry

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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