Repair of your product any brand is no problem with the skilled people we have, 
and the suppliers who support us.Our experience is in the preparation of 
economic proposals
Save time and money call us, some proposals are obvious, 
because of our experience. 
 Replacement  motor controls are available from
 many suppliers, we propose the most suitable ones for you. 
We  help with guaranteed proposals for New Applications 
By asking relevant questions about your application, applying our knowledge and  
experience, and making guaranteed proposal. 
In a  Breakdown situation we can provide experienced tradesmen to repair 
your equipment, and if required commission it to ensure the root cause of failure 
is taken care of.
 
top 
 
Proposals
Our policy: at least two proposals
Our policy is to give you at least two proposals with relative advantages of  replacement 
products, or the product repair if applicable.
Completion dates, are fundamental for you to decide the economics.
 
Over the phone proposals are only possible in certain cases, call and find Otherwise 
we need to carry out a check and report.
 
We will give a Free 15 minute check and report within the workshop. 
Otherwise an agreed charge will apply
 
top
 
     
Typical work            Extraordinary Work
 
top
 
Fundamental control Products
Direct on Line control 
Most basic of controls uses a contactor , combined with a current 
sensitive overload device. 
Usually has a simple red pushbutton for stop, and green for start.
May be in an IP 56 enclosure for wet environments, or 
mounted in a control panel. 
Very common up to 7.5 kW . 
May be used on all sizes of motors , depends on the supply capacity.
(Big Motors draw a lot of current, may drop the voltage too much on start up if the 
supply cable is small)
 
top
 
Star Delta Starter
Used on larger motors to decrease the current taken on start up
Motor will start with windings connected in star. 
This supplies effectively 230 volts to each phase of the motor. 
This results in a reduced current taken by the motor, 
this results in a reduced torque on starting. 
Starting off load is idea for this device.
More expensive than a direct on line starter.
 
top
 
 
Electronic Soft Starter
Used on all sizes of motor to reduce the starting torque and current taken
To reduce supply voltage drop, also wear and tear on machine parts.
top
 
 
Power saving Intelligent Soft Starter
This device acts as an electronic soft starter, with an added intelligence to reduce the 
supply voltage to themotor when it is lightly loaded.
This device is more expensive than the Electronic soft starter, but can pay for itself in 
weeks of use in the correct application.
We are New Zealand Agents for  "Powerboss Intelligent soft starters"
To understand more , click on Email above.
 
top
 
 
AC Variable speed controls
As Replacement units 
We  commonly fit these to replace smaller DC motor applications.
The reason being the reduced maintenance cost.
These also commonly replace the Mechanical Variator which is also high in maintenance.
New applications
New applications are huge and varied from simple precision speed control, within 0.01 %, 
with either tachometer feedback or tachometer less Vector drives. Vector drive use 
impulses from within the winding to tell how fast the rotor is rotating. Through to the 
positional precision achievable with encoders, where two or ten motors may operate 
in synchronism with each other to carry out a process.
 
Considerations on the applications  are: 
The load speed/torque characteristic
The drive speed torque characteristic
The need for control of torque, or speed
 
( Torque control is commonly used in tensioning applications where paper of plastic 
needs to be rolled speed control is used on extruders, or on process which will vary if 
the speed varies. Is the load direction going to vary? In plastic extrusion the film needs 
to leave the die at precisely the correct rate. The controlling motor may be called the 
nip roller. On start up the motor pulls the product from the die, but when rolling up the 
product tension is needed to make the roll quality. This tension is transmitted to the 
nip motor, so this ends up having to pull backward, even though it is rotating forward 
at a constant speed. This is a called a four quadrant drive.
 
top
 
DC Variable speed controls
On small Motors under 1.5 kW these speed controls are still the cheaper option, 
Maintenance is the disadvantage of these small motors.
They come in a huge variety of specifications, as per ac controls, depending on the 
application. Dc Drive controls usually give a larger starting torque for the same power 
output when compared with AC controls. Most economic to fit a replacement DC drive 
where one has failed,  But if reliability and maintenance are an issue, ac drives are 
worth weighing the economics.
 
top
 
Typical Work we have carried out
Baldor 0.37 kW 1750 rpm motor and KBIC drive.
Call to site, found dc motor damaged by running very worn brushes. 
Also the electronic drive damaged by the nature of the load.
Put proposals on repair of existing motor and drive, and replacement 
with ac. Drive and motor. Supply new ac motor, make and fit adaptor to suit \
metric motor mounting in imperial frame. Supply and mount new ac drive, connect 
and commission
 
top
 
Typical Work we have carried out
Shinko Temperature controller not reliable in its operation.
Call to site, check operating parameters, make proposal for original and 
alternative brand.Supply alternative only as requested
 
top
 
 
Extra ordinary Work we have carried out
Parvex Servo Motor,280/37Amps,2400 Rpm , Mod-LC640TFR0514,
Faulty encoder position, another company had serviced this motor, and 
did not record accurately the encoder position on the shaft. Have spare 
electronic drives coupled to act as power supply with encoder feedback. 
Test encoder, and by elimination find encoder position. Make up a test 
rig, and instructions so that the test can be repeated at any future date easily.
 
top
 
Extra ordinary Work we have carried out
Reliance 10 hp AC servo motor , connected to Lenze drive, tripping out 
intermittently. Two motors connected to a common shaft were driving 
one roller through 0.5 turn in electrical synchronism with another two 
motors on another drive roller. Process waited 0.2 seconds before 
repeating the cycle. Found the drive was in fact overheating, check 
current output to each motor on each phase. Because of transient nature 
of the work cycle use datalogger over cycle time. Found motors were 
identical, and performing fine. Output current was at times excessive. 
Data logging showed an unusual harmonic each 4 work cycles. 
Checking of earth system and all machine and control connections 
finally found a loose encoder coupling, the loose coupling combined 
with the response time of the feedback loop mean that we created an 
unstable control system with  the worn coupling. New coupling rubber fixed it.  
This work carried out for Sam Pomare
Engineering Manager of Visy Board.
 
top
 
Extra ordinary Work we have carried out
Truck Refrigeration Compressor tripping intermittantly 
230 volt SEW variable speed drive connected to a 1.5 kW refrigeration compressor. 
Trips were so infrequent, that we could not stand there and view the problem,  the 
importance of one trip was sufficient that it could loose the quality of the frozen goods. 
Connect datalogging equipment to the drive output to have the  see if the problem was 
current,  voltage or drive related, Have datalogger record 1 second of waveforms before 
and after a start and stop. Traced fault to compressor sometimes starting with 
insufficient delay, for the compressor to unload. Fit time delay relay.
top
 
Extra ordinary Work 
75 kW 1425 rpm motor driving Rollercoaster at 
Rainbows end. Measure energy used prior to fitting 
energy saving powerboss,  Fit Powerboss Intelligent 
soft starter, Carry out energy audit. Found 25% 
savings over identical period, this represented a 6 
month payback on the capital cost of $2000.
 
  
 
top