3-36. TRANSITION RELAY PANEL
This task covers:
Tool kit SC4940-97-CL-E12
1. If the locomotive does not transition before removing transition relay panel, perform the following:
a. Connect positive lead of multimeter to TB1-M and negative lead to TB1-K.
b. Operate the locomotive to the speed where transition should take place.
c. The indication on the multimeter should be 10 V ac or more.
d. If a 10 V ac signal is present on TB1-M, transition relay panel is probably defective. If no signal is present,
speed-sensing alternator is probably defective.
High voltage is used in the operation of equipment. Do not
be misled by the term LOW VOLTAGE. Potentials as low as
50 volts may cause death.
Remove rings, bracelets, wristwatches, and neck chains
before working around the locomotive. Jewelry can catch on
equipment and cause injury, or may short across an electrical
circuit and cause severe burns or electrical shock.
2. Open electrical equipment cabinet door and set battery switch to OPEN.