Curtis controller model numbers

[jcmassey@netspace.net.au]

Hi all

We have in for repair a couple of Curtis 1209B-7204 controllers, rated as
72-120V, 275A.

Q1) Do Curtis rate controllers on motor amps, battery amps, or both the same?

Q2) Does anyone have data on what this controller is supposed to do? the
customer has an OEM connection drawing, showing the 4 power terminals, a
2-wire pot and a control wire on the 3rd terminal - but it fails to show
where the other end of this control goes to! we suspect it is switched B+
w.r.t. B-, but can someone help?

Q3) Those of you who have had Curtis failiures, what failed and do you know
why?

As an aid to repair we are drawing up the circuit.

James Massey