Failure detection circuit for dynamic braking system
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United States of America Patent
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-
May 13, 1980
Grant Date -
N/A
app pub date -
Aug 25, 1978
filing date -
Aug 25, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diesel electric locomotive has a dynamic braking system including a plurality of traction motors connected across dynamic braking grids. Air blowers for cooling the grids have motors which are connected across the grids. The failure of any motor is detected by monitoring the voltage across the motor with respect to a reference potential. The reference potential is developed in a bridge arrangement wherein the bridge imbalance is detected by a current sensor or by a reference potential generated in another motor circuit where another current sensor is used to detect a variance from the reference value. A circuit responsive to failure signals but voltage isolated from the traction motor circuits actuates an indicator as well as a relay for diminishing or terminating the dynamic braking function.
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