Technical data

CHAP-04.10 ELECTRICAL POWER DISTRIBUTION, DRIVES, CONTROL &
ILLUMINATION ELECTRICAL
Page 22 of 50
d) Selection of control mode in REMOTE of master selector switch
for each material flow path block chain.
On receiving start permissive signal from HMI, the operator will give
ON command to start the desired conveying route.
vii) Normal stop and Emergency stop of mechanism for each material
flow path, P.B, switches for pre-start warning signal for each material
flow path, start & stop P.B. switches of drives with independent
operation etc. will also be mounted on desk/ HMI.
viii) A pre-start audio warning signal through hooters will be given in the
premises where the mechanisms are to be started before start of the
mechanism. The duration of the pre-start audio signal will be as per
requirement. Sequential start of the mechanism will be possible only
after the pre-start audio signal is over.
ix) The conveying system will be integrated with the associated auxiliary
/ other system for interlocking, sequencing and monitoring.
x) Stopping of mechanisms:
a) For regular stop, the feeding equipment will be stopped first to
stop the material flow in the conveying path and then after some
time delay the equipment in the route will be stopped in sequence
from feeding end ensuring no material is in the conveying path.
b) Emergency stop push button will be provided on the Control desk
for emergency stop of material flow path.
c) In case of tripping due to fault of any drive, the part of the
conveying route before the faulty drive will stop. There will have
signaling of the stopped mechanisms by changing color in the
graphic. This will give an indication of the fault.
6. Signaling:
A) Status of ON, OFF, Trip/Fault, Route selection etc. for all
mechanisms of conveying system, dedusting system, dust
suppression system, weigh feeder etc. will be available in the
operator work station.
B) When a drive in a conveying route is shifted to local controls,
indication will be available in the HMI.
C) The annunciation will be provided on HMI for each drive fault and
actuation of safety and limit switches.
a) Annunciation for O/L & fault of each drive motor.
b) Individual annunciation for all HT motors trip due to high