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Immingham Storage Company Limited – East Terminal
No.3 Pumphouse Modifications – MCC - Basis of Design
P & I Design Ltd
DOCUMENT NO: SI451003_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: A DATE: 07.08.12
Tel: + 44 (0)1642 617444
PAGE 4 OF 7
Fax: + 44 (0)1642 616447
www.pidesign.co.ukControls Voltage 24Vdc. A central control transformer will be provided in each MCC
and 24Vdc individually fused and distributed from here to each drive
compartment
Short Circuit
Protection
It is noted that the site preference is to use MCCBs. The circuit
currently shows fuse protection. Calculations will have to be
performed prior to construction issue drawings being issued to verify
earth fault clearance times are satisfied using MCCBs with the cables
currently installed.
The MCC circuit design is generic. Any interfacing with a control system, for example
with a road loading batching system, will be dealt with in a logic panel co-located in the
same switchroom. This is likely to culminate in a single permissive contact wired from the
logic panel to the MCC compartment. This design enables the MCC circuit design to
always be the same and thus familiar to the user.
A marshalling section will be provided, thus all field control wiring will be diverted to the
marshalling section from where it will be internally wired through the MCC. This again
permits a standard circuit design to be utilised.
3.2
MCC Operator Interface
Compartment door mounted controls :-
o
Start (momentary pushbutton)
o
Stop (Red mushroom head stayput pushbutton)
o
Auto / Off / Manual control mode selector switch
Compartment door mounted lamps for :-
o
Running (Green)
o
Stopped (Red)
o
Fault (Amber) : Fault = Soft Start Fault, Overload or Field mounted stop
button pressed
o
Low Suction Level (Amber)
o
High Discharge Temperature (Amber)
Door mounted overload reset button
o
Soft Start – via door mounted operator panel
o
DOL – via door mounted button
Power Indication
o
Drives ≥ 37kW to have multi-function power meter. Meter to have the
ability for Modbus output for connection if desired to PLC/SCADA for
remote monitoring, trending and reporting
o
Drives < 37kW to have door mounted ammeter
o
All the above to be via current transformers
Compartment door fan and filtered inlet for all soft start drives