Technical data

CHAP-04.10 ELECTRICAL POWER DISTRIBUTION, DRIVES, CONTROL &
ILLUMINATION ELECTRICAL
Page 21 of 50
 REMOTE interlocked route wise control of conveying system
from the HMI at Dispatcher/ Control room.
ii) Mechanism selector switch for selection of above modes of operation
of each drive motor will be provided in the MCC / Control Panel /
MCP. A selector switch box will be provided near respective Remote
I/O station for HT motors. Local selection of any drive will be shown
on the HMI screen with some sort of caution.
iii) The local de-interlock mode is meant for testing and maintenance
purpose only. However, all safety interlocks (Pull Chord Switches,
motor Over Load & emergency stop etc.) will be connected in LOCAL
de-interlock mode of operation. In local de-interlock mode the
mechanism is not interlocked with other drive and after receive of
permission from operator / PLC drive/equipment can be started from
LCS independently.
The stop P.B. of local control station will be able to stop the drive
mechanism selected for any mode of control. Hooter PB will be
provided in LCS for pre start warning.
iv) In Local interlock mode the drive / equipment can be run in sequence
interlock from LCS. Selector switch will be put in local interlocked
position and permission from operator / PLC will be a condition for
operation in this mode. Start, stop, motor Over Load, emergency
stop, Pull Chord and Belt Sway Switches, Zero Speed Switch, chute
jamming switches will be connected in the circuit in addition to
sequence interlock with successive drives. All the above will be
connected through hardwire.
v) In Remote interlocked individual mode of control the drives/
mechanisms in the material flow path will be started in succession
sequentially opposite to direction of material movement from
operating station / HMI. On tripping of any conveyor/drive/
mechanism, all the mechanisms feeding to the affected (tripped)
mechanisms will stop according to material flow diagram. All the
mechanism selector switches of the selected material flow path will
be set to REMOTE position in this case. Programmable Logic
controller will be used for the control, interlocking, operation, and
monitoring of the equipment.
vi) In Remote interlocked Route-wise control, following operations is to
be carried out from HMI by the operator before starting of a
conveying route:
a) Selection of material flow path including source and destination
as per requirement.
b) Selection of mechanisms within the selected material flow path.
c) Selection of switching devices, flap gate etc. in a conveying route