Chapter 5 - Electrical Control Cabinets
Medha Servo Drives Pvt Ltd.
24
motors to crank the diesel engine. Starting motor torque increases and the
diesel engine cranking speed increases until the engine starts.
5.3 ECC#3
The Electrical Control Cabinet#3 mainly consists of Two Circuit Breakers and
6 contactors, as shown in Fig. 5.5, to run the radiator Fan Blower Motors
either Slow speed or Fast speed for cooling engine water temperature.
The various internal equipments
(not driver accessible) included in
ECC#3 are:
1. Fan contactors FCS 1, FCS 2,
FCF 1A, FCF 1B, FCF 2A and
FCF 2B
2. TB's 83A, 83B, 83C
3. MRPT (Main Reservoir Pressure
Transducer)
4. Connectors 823A, 823B, 823C,
823D, 833A, 833B, 833C and
833D
The LCC performs the following function for COOLING FANS TWO SPEED
A.C.MOTORS CONTROL. Each fan motor circuit consists of one slow speed
and two full speed contactors. FAN MOTOR 1 with associated slow speed
contactor FCS 1 and fast speed contactors FCF1A and FCF1B. The circuit
for FAN MOTOR 2 operation is in a similar manner. The cooling system
designed to normally maintain operating temperature of 79°C to 85°C. Both
fans will be picked up in sequence, starting with the slow speed mode. There
is a 20 seconds interval between FAN 1 & FAN 2 energiation. When the
Engine temperature crosses 85°C then both FANs will be picked up at fast
speed as required. There will still be a 20 seconds interval between picks up,
in the same order as slow speed. Once the fan is turned ON, it must remain
ON for at least Two minutes before it will be stopped down from FAST to
SLOW, and SLOW to OFF. If circuit breakers trips due to any reason, an
appropriate message will be displayed on display screen for information to
Fig. 5.5 Electrical Control Cabinet#3
