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 49 of 63
-Instantaneous over current -Transformer fault ,If
applicable -Cooling fan failure – Stall monitor for
motor alarms -Motor fault (winding / bearing
temperature, vibration) as applicable -Loss of
frequency command -Shall be able to store at
least 16 previous faults in memory on FIFO
sequence . In addition to annunciations in
keypad , a separate annunciation window
shall be provided on front door of the VFD
panel .
25.0 Meters -Output voltmeter and ammeter with selector
switches. -Input volt meter and ammeter with
selector switches . -Output frequency meter
(digital type). -KW meter for drive ratings above
200 KW. All digital display shall be programmable
.
26.0 Other features
26.1 Bus Regulation DC Bus regulation should be available to reduce
the possibility of drive overvoltage trips due to
regenerative conditions.
26.2 Load dependent
current limit
Programmable current limit from .1 amps to
150% of drive rated amps. Current limit to be
active for all drive states; accelerating, constant
speed and decelerating.
26.3 Dynamic Braking The drive shall have an internal, built in 7th IGBT
for use as a dynamic braking chopper. This IGBT
shall have enough capacity to handle greater than
or equal to 100% regeneration power from the
output, continuously. The drive shall also have a
“drive mounted” dynamic braking resistor for low
level braking applications and interactive software
to protect the “internally” mounted resistor from
abuse.
26.4 Fault Memory 16 nos. of faults to be stored on FIFO basis for
fault analysis .
26.5 Ride Through The control logic should be capable of "riding
through" a power outage of at least 0.5 seconds
in duration. The inverter section should be shut
off after an 18% drop in bus voltage to conserve
power for the drive logic.
27.0 Selector switches -Local / Remote . -Auto / Manual . -Main / Bypass
. All the selector switches shall be of 10 A rating .
28.0 Pushbuttons -Trip reset . -Start.
-Emergency stop.
29.0 Lamps -Drive ready . -Drive trip . -R , Y , B phase power
ON . -Control supply ON . All the lamps shall be of
cluster LED type having low voltage glow
protection..