Has anyone here ever calibrated a SUN RAM X1/I? (NLC)

[2F45T4U]

no one seems to know much about these now worth a shot posting this here as well as i have on efi101. they're either retired or no one really uses them enough now and the new boys dont know much about them. If i can get a few pointers it should be no bother.

Ive been insanely busy lately so not had a chance to play with it for a few months. Id sucks when life gets in the way of a good hobby

Anyone had much experience with this that i can pick your brains about?

Standard setup, but i've re-wired everything between the field instruments and the cabinet. Its all working fine and controlling the load very well. Now is the time to do a proper cal before i start using it in anger.

have replaced the pot' with this one as the first couple of tracks were worn making it jumpy between 0-20hp

its the same one that was fitted when i got it, whether or not its right i cant say, but by levering the retarder forward the range appears to be reasonable.

the light box photocell RPM pickups seem work 0.2v dark, 12v light. so if i inject a square wave at a frequency derived from the number of holes on the disc this should allow me to span the roller speeds?
However, there are 2 female Jack sockets in the cabinet marked 'idle roller' and 'load roller' and an 'FC control' rotary switch between the two. see below:



i'm guessing the 'in/out' allows the roller speed raw signal to be measured coming in and allows you to inject the frequency from the panel would this be correct? or can this be used to simulate/inject speed and load in order to adjust the power calculation for the output or the proportional controller for the absorber output?

the zero and span trim pots are clearly marked on the board so calibration of the speed and load would be dead easy if i knew a little bit more about the proper procedure.

how is a dead-weight/static calibration of the load pot performed? is this just a 2 point calibration between zero and full scale? i'm hoping that if the load is fairly linear then i could calibrate to say 50% range and build a force frame and add weights to suit.

A funny thing also happens when i plug in the Dynoplot, both needles rise a couple of percent. i don't know if this is affecting the readouts or just the analogue display on the gauges. i guess its not too important and its just the extra load of the DAQ resistors on the analogue output driving the needles up.

mean while, here are some project pics of the thing so far.

http://s1175.photobucket.com/albums/r62 ... namometer/

Cheers,
Fraser

[r10crw]

Have you checked with Ricky Gauld? Sure he had an old sun thats been upgraded.
Craig.