The Digital Notch Indicator developed by M/s Laxven Systems is a Micro Controller based for
use in Electric Locomotives to indicate the position of notch engaged, in seven segment
digital form in both the cabs of the locomotive to the driver. The system also has indications
for half notch struck up below or above the notch position and DJ trip indication (with notch
indication where the DJ trip took place). This digital notch indicator can be used for both ABB/
GANZ type.
The events like DJ trip, Half Notch struck up, Power ON, Power off Conditions are stored in
memory with real date & time stamp in a non volatile memory. The system can store up to
10000 events (First In First Out). This data can be down loaded to the computer with special
software developed by M/s Laxven systems.
The Digital Notch indicator is provided with CAN BUS to share the information of the notch
position with other electronic devices having CAN BUS facility, working on the locomotive.
The system is powered from DC voltages available in the locomotive. For Electric
Locomotive, it is suitable for the voltage variations between 70V DC to 140V DC.
The mounting positions of the transmitter and indicators are exactly maintained as that of
ECIL’s transmitter & indicators for interchanging and retro-fitment. The same wiring and
numbering is maintained to avoid confusion among the shed staff while installation and
commissioning.
The Digital Notch Indicator conforms to the RDSO specifications. Laxven has also developed
the test equipment and calibration tools to calibrate the Microcontroller based digital notch
indicator.
Highly Accurate, stable and reliable Microcontroller based System
Less Maintenance and long reliability
Self diagnostic and fail safe Microcontroller based System
Highly accurate measurement of angle (0.01 degree measurement)
System can be used with ABB/GANZ tap changers
Highly reliable and accurate synchro transmitter.
Two digit LED display of One inch size for better viewing of the
notch indication
Half notch indication and recording enables the loco crew to identify
the problems in the tap changer.
Alignment of synchro transmitter electrical null point with tap
changer null position can be done very easily
Power supply can work from 50V to 140V DC and can be used on
any Indian railway locomotive.
Switch mode power supply provided with built in protection for
Reverse Polarity, Input over Voltage, Over Current and Short
Circuit. High capacity filters provided for Surge/Transient
suppression and EMI/EMC suppression.
Events are recorded with date & time stamp in a non-volatile
memory for post analysis.
10000 events recording in FIFO manner
User configurable parameter entry through Laptop
Mounting and dimensions are similar to the existing system.
CANBUS provided for data communication with other micro
processor based systems
Downloading of data using RS232 port.
User friendly and powerful Analysis software for post analysis of
data
Downloaded data can be converted to Excel file format
Power Supply voltage
:
50 to 140 V DC from loco battery
Power
:
Less than 12 Watts
Accuracy of Angle
:
0.01 degree
Notch Measurement
:
Through Synchro transmitter
Tap changer selection
:
Through Selector switch provided under lock
Null alignment of
Synchro
:
Through push to ON switch provided under lock
Recording System
:
10000 events recorded with date & time stamp in FIFO manner in Non-volatile memory
Recording of events
:
1) Power ON/OFF
2) DJ Trip indication
3) Half notch struck up
4) Zero setting of synchro transmitter
5) Internal faults
Display
:
2 x 1 inch seven segment LED display for notch indication and 1 inch UP & DOWN arrow seven segment LED display
for Half notch indication
LED Indications
:
LED indications are provided for DJ Trip, ABB/GANZ
selection and internal faults
