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Application warning for Welders

If you are planning on powering a three phase welder from a Booster you need to pay special attention to the information on the machines rating plates. In order to establish the maximum power requirement you must know:

The maximum weld current (I) in Amperes
The duty factor (D) in %.

A welder rating plate will show this in the following form e.g. 200A @ 100%, 300A @ 60%, etc.

Once you have this data you need to perform the simple calculation

Power (watts) = 50 x I x (D/100)

So for a welder with rating of 300A @ 60%
I = 300
D= 60
Power = 50 x 300 x (60/100)
Power = 9000 W or 9kW

So you would need a Booster A12 as the Booster A8 is only rated at 8kW maximum.

If you are in any doubt please call our technical team on 07572 532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement

Application warning for garage ramps

Some such machines have motor(s) labelled at a lower rating than normal because they are used infrequently or intermittently. The phase converter should be specified for continuous rating, which might not be indicated on the rating plate

Contact the manufacturer and establish what the continuous rating of the ramp/lift motors combined is.

If in doubt, it is recommended that the minimum power rating for the phase converter is 4kW for a car lift/ramp as they rarely operate at lower power.

If you are in any doubt please call our technical team on 07572 532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement

Application warning for air conditioning

Three phase air conditioning and refrigeration units are generally without issue but it is important to check that all single phase loads that are part of the unit can be taken from L3 to neutral or can be powered from a separate single phase supply, otherwise a delta-star transformer will be required as well as the phase converter.

The phase converter must be rated for the maximum power condition, if you are in any doubt, contact the manufacturer directly to establish what the maximum power condition is.

The phase converter is not designed for continuous unattended operation. If it is to be used continuously the warranty is void unless it is installed in such a way that it is started and stopped ‘on-demand’ by the load with a duty cycle of less than 50%.

When used in a critical application we recommend that they are installed in a 2 x 100% duty/standby configuration so that the site is unlikely to be left with a total system failure.

If you are in any doubt please call our technical team on 0757 2532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement

Application warning for ovens

These are primarily resistive heating loads with the possible addition of small motors for fans, spits, etc. If there are no motors or they are all single phase types then a phase converter is not required.

The heating elements can be re-arranged for direct single phase if 230V types or single phase via a step-up transformer if 400V types.

If the specification is 3 x 230V or similar, rather than 3-phase 400V or similar, then a phase converter should NOT be used as this is not a true three phase machine.

If you are in any doubt please call our technical team on 07572 532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement

Application warning for printing

Small printing machines are no problem. However, a large printer with integral computer and uninterruptible power supply might require a special D-series phase converter which is designed to balance the phase-to-phase voltages to +/- 5% to avoid the UPS switching in unnecessarily.

It is also likely that a delta-star transformer will be required on large printing machine as there are likely to be single phase loads spread across all three phases.

If you are in any doubt please call our technical team on 07572 532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement

Application warning for lifts

Powering a lift with a three phase converter requires special consideration. In the first instance there are several questions that need to be asked of the lift manufacturer:

What is the total power consumption at the maximum load point, including all power consuming elements but excluding additional power for motor starting ?
Please list loads that are connected phase to neutral, stating which phase is used in each case.
What is the maximum power for standby battery charging ?
What % imbalance in the three phase-to-phase voltages is acceptable ?
When regenerating power back to the 3-phase supply, what is the maximum acceptable supply imbalance, voltage / current / impedance ?
When starting the phase converter from lift demand (the button), are there separate relays / contactors for single phase input and 3-phase output and is there a time delay between them ?
When the 3-phase converter detects low voltage (phase L2 to L3) and supplies momentary 'boost' for starting, what is the tolerance on momentary low and high voltages ?

When used in a critical application we recommend that they are installed in a 2 x 100% duty/standby configuration so that the site is unlikely to be left with a total system failure.

It is also important to check that all single phase loads that are part of the unit can be taken from L3 to neutral or can be powered from a separate single phase supply, otherwise a delta-star transformer will be required as well as the phase converter.

Once you have established all of this information please contact our technical team on 07572 532884 to discuss your options as a custom solution may be required.

Please confirm you have read the above warning statement

Application warning for heat pumps

Ground source heat pumps are becoming very popular and the larger units require three phase supply.

The problem is that heat pump suppliers like to show the average electrical power over a year so as to produce a COP (co-efficient of performance) of around 4 (heat output = 4 x electrical input).

However, the phase converter must be able to power the heat pump at all times, including worst case conditions.

It is ESSENTIAL to obtain from the supplier, in writing, signed by a responsible person, the MAXIMUM electrical input power, excluding momentary start-up conditions. As this is the rating that is needed to in order to supply you with an adequately supplied Booster. Failure to do this will involve your Booster being potentially under-specified for the application causing it to fail.

Our warranty is void and we will not accept any returns if we have not received this signed statement from the manufacturer. The phase converter is not designed for continuous unattended operation.

If it is to be used continuously the warranty is void unless it is installed in such a way that it is started and stopped ‘on-demand’ by the load with a duty cycle of less than 50%.

When used in a critical application we recommend that they are installed in a 2 x 100% duty/standby configuration so that the site is unlikely to be left with a total system failure.

We do not honour our guarantee or accept any returns if we have not received this signed statement from the manufacturer.

If you are in any doubt please call our technical team on 07572 532884 – please have as much information to hand as possible.

Please confirm you have read the above warning statement