Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 24 of 63
(2) Wagon Tippler and Side Arm Charger
(i) Variable Voltage Variable Frequency Converters (AC Drives):
- AC drives shall have communication facility with PLCs for data transfer
and speed reference set point.
- Software of AC drives shall be developed in such a way that after over
voltage or under voltage when the drive trips, the AC drive shall be
automatically resetted without any manual intervention after normalising
of the voltage.
- Remaining features shall conform to General Technical Specification
(ii) Programmable Logic Controller (PLC) :
- The system shall be complete with CPU, I/O racks, memory, key board
and monitor. HMI shall depict graphics of various mechanism operations
and also provide alarm annunciation system. Spare CPU with loaded
software shall be installed in the PLC panel.
- Communication between PLC and AC drive shall be possible for smooth
operation of the Tippler. PLC shall have facility to communicate with
Despatcher-D1 / Central Control room PLC. All the required hardware
and software for these communications shall be provided.
- PLC shall perform the following task :
(i) Logic interlock functions, control & supervision of drives &
solenoid valves.
(ii) Automatic sequential operation of various drives.
(iii) Status indication & signaling.
(iv) Fault monitoring & annunciation.
(v) Diagnostic features to recognise and display faults.
(vi) Communicate with Despatcher-D1 / Central Control room PLC.
PLC input interrogation voltage shall be 230vAC and output
voltage 24vDC
- Remaining features shall conform to General Technical Specification.
(iii) Control Desk :
- Control desk shall be provided for centralised control, monitoring of all
the drives of Wagon tippler and SAC, including annunciations of all the
faults, over-load trip condition of drives, failure of safety devices, all
faulty conditions, warning conditions, over/under positioning conditions,
over travel conditions etc. Separate and independent annunciation for
each shall be provided instead of group annunciation.
- Control desk shall have suitable nos. of status indication lamps to cover
complete dust suppression system, SAC positions & movements