I'm checking out a M28KSR that looks like
it has had some major rewiring done to it.
All the jumpers that are normally on terminals 4-14 of the
cabinet terminal blocks have been removed. There were
two, 4 conductor, external cables connected to the cabinet
terminal block, all unterminated, except for a 2k power
resistor (loop current limiter) connected across C10-C11.
I see no designator on the LESU and the color codes of the
cable from the LESU to to c5 - c14 do not match the colors
I see on 2874WD (or any others). The LESU has what looks
like a Line Shunt Relay, a 120VDC power supply (with
monitor jack), a Motor-Stop relay and an 120VAC input
panel ( lamp switch & fuses). See picture enclosed.
Can anyone identify this LESU?
I tried to remove the LESU by removing the big screws.
The LESU was loose, but would not come out, apparently
because of the front panel power switch extension
mechanism. I expected it to disengage when I lifted up
the LESU, but it did not. Is there something in the
switch extension mechanism that has to be
removed/released?
Thanks,
Duncan
K2OEQ