Chapter 5 - Electrical Control Cabinets
Medha Servo Drives Pvt Ltd.
28
14.
DCL 1 to 6 Circuit Breakers:
This 10A circuit Breaker protects the
DC LINK contactor Motor and control circuits.
15. A safety guard over the Breaker lever helps to prevent accidental
operation. 6 Nos of DCL Circuit Breakers are provided for individual
DCL Motor control.
16.
TC 1 COMPTR TO TC 6 COMPTR Circuit Breakers:
This 10A
Circuit Breaker provides power and protection to Traction
Computer#1 to #6 and associated circuits. A safety guard over these
Breakers are provided to prevent accidental breaker operation.
17. GEN FIELD. Circuit Breaker:
This 90A Circuit Breaker protects the
Traction Alternator Field circuit. The Companion Alternator supplies
Traction Alternator Field Excitation current through Silicon
Controlled Rectifiers (SCR's). The GEN. FLD. Breaker protects the
SCR's, Traction Alternator, Companion Alternator and other
associated circuitry. If the TA field current overload occurs, the
Breaker trips and the Locomotive Computer Displays the
Message:
“Main Gen. Field Circuit Breaker is tripped under load”
18.
TCC BLOWER 1 to TCC BLOWER 6 Circuit Breakers:
This 30A
Circuit Breaker protects the Traction Inverter Blower Motor and
associated circuit.
19.
GROUND CUTOUT Switch:
This Toggle switch, when open,
disconnects ground protection sensors (Ground leakage current
sensors PGND MG, VE, PGNDPI-VE, PGNDG1,
PGNDG2, PGNDTI1-6) from Locomotive electrical circuits for
maintenance inspection or troubleshooting. When switch is open, the
LCC prevents TA excitation. This switch is normally locked in the
closed position by a pin that is safety-wired to bracket. This setting
arms the ground fault protection.
5.6 Test Panel
Test panel jacks provided on the Circuit Breaker panel,
enable Maintenance personnel to conveniently check the
following voltages:
1. Main Generator (Traction Alternator) Field voltage
2. Companion Alternator Output voltage
3. Load Regulator voltage
4. Loco Battery voltage (Battery Positive-Battery
Negative)
Fig. 5.9 Test Panel