FLUOESCENT BALLAST ADVICE REQUIRED

[Arnold9801]

I am swapping the ballasts in 4 of my six twin tube fluorescent workshop lights.

The problem I have is that now I have replaced them with new ones, only 1 of the 2 bulbs illuminate on each of the 4 lights.

I have swapped the bulbs around and the same thing happens, so this rules out the bulbs themselves.

The defective ballasts were Thorn and the new ones- equivalent are Tridonic.

The problem I feel lies with the terminal numbers as on the Thorrn they are labelled 1 to 6, whilst on the Tridonic they are lablelled 11 to 16.

I have taken it that the Thorn 1 is 11 on Tridonic and Thorn 2 is Tridonic 12 and so on.

However I don't think this is correct and would appreciate some advice on how to understand the terminal diagram on the ballasts as I have it wrong obviously!

Regards

Arnold9801

 

[bernardgreen]

This is PROBABLY the way the twin tubes are connected to the Tridonic. It would help if you provided the Tridonic part number

 

[Arnold9801]

The Tridonic ballast is a PC 2X58 T8 PRO si. it replades the defective Thorn GK258.

Each one has the wing diagram on it, but to me I am not sure which ones on the Tridonic match the ones on the old Thorn.

 

[ericmark]

It would seem wire 13 on Bernard's diagram does not exist on the Thorn fitting so will need adding.

 

[333rocky333]

Most tridonics use 6 wires only including a pc pro 2x58
The outer 2 terminals call lamp 1 go to lamp 1 end cap
The 3rd inner terminal next to them goes to lamp 1 other end

The other outer 2 terminals call lamp 2 go to lamp2 endcap
The 3rd inner terminal next to them goes to lamp 2 other end.


Each tube has 4 endcap terminals, therefore 8 for two tubes
You now have 1 unused terminal on lamp 1 endcap
You now have 1 unused terminal on lamp 2 endcap
Link these terminals together, if theres wires in already, join together, if it is a 6 terminal ballast then they do not go back or connect to the ballast

Bernards drawings a pca ballast for dimmable T5 lamps and not suitable for use with your T8 58watt lamps

Easier to forget the old numbers and connect as bernards diagram,if you have a SEVEN term ballast, but if you have a SIX term ballast just ignore term 13 and the link back to the ballast and connect the same as the remaining six terms as shown in diagram