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
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