I need to convert this welder to operate on 400 volts,it currently operates on 240 volts,i have no tap diagram,can anyone help?

To rewire a Delta AP 400 Dust Collector to 220 Volts, you will need to obtain the right wiring and circuit connectors. You may need to consult an electrician or technician to complete the job safely.

You have not indicated what a toshiba is.
If it is a television set that is made for the electrical current in the United States, it will not operate in Jamaica, for that matter it should not even plug in.
There are adapters that will convert the electricity for you when you buy them somewhere.
God bless your efforts.

Check around power entry if you have a selector switch.
If so, slide it to 240 or 220V~.
Otherwise you would need an external step-up 120AC-240AC transformer, rated capacity high enough to handle the current of treadmill.

Try this link and search for information
http://www.lincolnelectric.com/en-us/support/Pages/resources.aspx

if i understand correctly you have it connected to a 240 volt circuit protected by a 20amp breaker, then you should have it on a minimum of a 240 volt circuit protected by a 30 amp breaker ,then you should have 120volts from the red wire to the white neutral wire and 120 volts from the black wire to the white neutral wire,or 240 volts between the red and black wires, then the unit should operate correctly as the dryer needs 240 volts and the washer uses 120 volts to operate as this is how the unit is wired to operate

Since most operate on the same basic principles, the motor control should use a simple pair of SCR's to drive the wire feed and speed. They are often a weak point as most are just 200 volt 8 amp standard sensitivity types. A standard Gate 400 volt 10 amp type gives a margin of reliability without costing much more, and sometimes less.

Various vendors sell them,

the baseboard heaters out put goes down a lot more than you would think when used on 120 volts ... thats because not only is the voltage half of what it should be, the current is also half .. so the total power (the product of voltage and current) is one fourth of what it would be if operated on 240 volts .. you are operating at only 186 watts instead of the 750 watts you should have .. so you would have to have 4 times as many heaters for the same heat output .. you likely have the 240 volts available (most houses do) .. there are two phases .. each 120 volts .. when both phases are used together then you get the 240 volts total .. another option is you can use heaters designed for 120 volts .. the current would increase to a little more than 6 amps per heater .. some heaters have a jumper you can move for 120 volt service or 240 volt service... you can use those with either voltage ..

http://www.search.siemens.com/cgi-bin/search.asp?SCSconfig=WWW2SEASIEMENSCOM-SEA&q=HTS%20400%20transfer%20switch

Here is a link to your manual.

http://www.flotecpump.com/pdf/FP745.pdf