Project/ElectricalWorks/DB3aRework

Introduction[edit]

A project to re-work DB3A.

Objectives :

Bring the Emergency Stop control into use for the 3-phase tools (as appropriate)
Separate the 16A sockets for the Bandsaw and MIG Welder onto individual circuits
Separate the Pillar Drill and Pedestal Grinder onto individual circuits
Provide a new 16A socket for the Planer-Thicknesser
Provide capacity for a new 16A socket in future

The existing board is based on 2 35mm DIN rails, each of 250mm length. These are mounted on a removeable back plate.

Three 4-pole NC contactors are fitted, but only being used as junction blocks at present.

The primary cable entry is via the trunking at the bottom of the box, with a single armoured cable entering on the top-right side.

Test Emergency Stop contactor power is working and correct.
Strip existing board
Strip back armoured cable sheath to ~20mm from point of entry
Move lower DIN rail down on baseplate to make room for wiring between DIN rails
Install Schneider 63A 4-pole contactor, connected to E-Stop system
Replace MCB 4L1/L2/L3 in Main Board with Schneider 32A Type-C breaker.
Wire new 32A breaker to new E-Stop contactor with 10mm conduit cable
Install new earth block onto wall of DB3A. Bond cabinet and door to earth block.
Connect Metal Lathe wiring directly back to MCB 5L1/L2/L3 in Main board - 4-pole junction / 20A
Install new 16A 3-phase RCBO's for Pillar Drill and Pedestal Grinder
Install new 16A 1-phase RCBO's for MIG Welder, Planer-Thicknesser and spare circuit
Install new 6-way DIN rail terminal block for neutral connections
Install new 4-way DIN rail terminal blocks for L1, L2 and L3 switched connections
Pull new 2.5mm cable through for MIG Welder socket. Remove old wiring from shared 16A box.
Install new 20mm conduit in ceiling to centre pillar.
Pull new 2.5mm cable through for Planer-Thicknesser socket. Install new 16A surface socket on central pillar.