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A terminal connection MK15 is supplied on the Interface Board to provide
for the connection of an external temperature sensor. The sensor is
customer supplied and may be used for such things as monitoring the
temperature of external brake resistors. By selecting the terminal
connections the MK15 input can accept a normally open or closed input.
If not used a jumper must be installed between terminals 1 and 2 of
MK15. When MK15 is activated the result is a fault trip with the "OTT"
and "EOT" LED's on the Interface Board being illuminated. The Control
Card will display "OVERTEMP". An "EOT" fault also disables the input
rectifiers so the main power to the unit is interupted and supplied only
through the soft charge circuit. It is important to note that full bus voltage
is still supplied to the unit through the soft charge circuit. If the fault
occured as a result of shorted brake resistors or a faulty brake module
the soft charge fuses will blow shortly after the trip.
"OVERTEMP" TRIPS
(CONTINUED)
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