Integrated Panel 30 hp Rotary Phase Converter

[Pages:3]Integrated Panel 30 hp Rotary Phase Converter

Features:

designed for Practical Machinist by Bob Nelson bnelson@

? Central three phase power plant with panel/controller for entire shop

? 53 amps per leg 240 volt three phase output (22 kw) from single phase input with additional upgrade capability to 106 amps per leg (44kw)

? Integrated design of three phase panel with standard rotary converter components allowing orderly power distribution to multiple machines

? Simple connection of all shop machines to single phase power supply

? Switching by compact three pole breakers for all shop machines

? Ease of adding additional idler motor(s) to increase power capacity, with option of running only the idlers needed for machine load at any given time

? Power loss protection with shutdown of entire three phase power plant upon unexpected power interruption, and prevention of automatic restarting of any connected machines upon return of power

? Phase loss protection due to short circuit or sustained overload on one or more legs for all machines, preventing single-phasing of motors

? Shielding of the panel bus and all connected machines from the start capacitor voltage surge during starting of idler converter motor, protecting control boards of any machines inadvertently connected during starting of the converter

Limitations:

? No phase loss protection to running connected machines resulting from shutdown for whatever reason of the converter idler motor(s); such protection would require a split panel bus design, or a separate panel dedicated solely to supplying power to load machines

? Design shown is not balanced, and improvements in both voltage and current regulation and overall power factor could be achieved by adding run capacitors between the other single phase leg and the generated leg

From 100 Amp Breaker in Main Panel: GROUND L1 L2

30 hp Rotary Phase Converter Design

Power Loss Protection Contactor 5A

100A

Power Plant Panel Control Station

START

STOP

5A

Wire Sizes: AWG 4: feeder from main panel breaker

ground from main panel panel main lug connections AWG 8: ground to power loss contactor ground to idler start box interconnections from panel to start box all idler motor connections incl. ground AWG 10: capacitor interconnections only ground to control stations branch circuits to load motors AWG 16: all control station wiring except grounds contactor (coils only) lead wiring all potential relay connections AWG 8: all other wiring not listed above

125 Amp Main Lug Three Phase Panel

Idler Motor Starting Box & Run Capacitors

Circuit Breakers 50A

80A

Blank Space 40A

75A

5A

5A 75A 60A

START STOP

60 mfd

Potential Relay

Idler Motor Control Station

300 mfd

Load Motor 15 hp

Idler Motor 30 hp

30 hp Rotary Phase Converter Parts List

Item

Manufacturer Manufacturer # Grainger # Price Each

Qty

3 Phase 125 Amp

Load Center, 24

Spaces

Square D

QO324L125G

6B460

189.50

1

Surface Mount

Cover for above

Square D

QOC24US

1D434

16.95

1

50 Amp 3 Pole

Breaker (run)

Square D

QO350

1D327

89.80

1

80 Amp 2 Pole

Breaker (start)

Square D

QO280

1D318

71.75

1

100 Amp 2 Pole

Breaker for main

house panel

Square D

QO2100

1D251

71.75

1

3 Pole 75 Amp

240 V (coil)

Contactor

Square D

8910DPA63V09

2CF96

90.50

2

3 Pole 95 Amp

240 V (coil)

Contactor

Square D

8910DPA73V09

2CF98

116.30

1

DPDT 60 Amp/2

poles 240 V (coil)

Power Relay

Dayton

5X848

5X848

23.46

1

208 ? 239 Pickup

Voltage Potential

Relay

Steveco

90-66

4E655

20.33

1

Preassembled

Control Station

Start/Stop

Square D

9001BG201

2EK13

42.90

2

Pilot Light 120V

Incandescent

Green

Square D

9001OG120

2EP97

12.25

2

60 mfd 370 V

Oval Motor Run

Capacitor

GE

97F9314BX

3GA14

15.80

9

300 mfd 250 V

Round Motor

Start Capacitor

Philips

3534B7A0270A220 4X662

12.66

8

12" X 12" X 6"

NEMA 1 with

knock-outs

Enclosure

Hoffman

ASE12X12X6

-----

41.62

1

24" X 18" X 6"

NEMA 1 with

knock-outs

Enclosure

Hoffman

ASE24X18X6

-----

116.50

1

Total 189.50 16.95 89.80 71.75 71.75 181.00 116.30 23.46 20.33 85.80 24.50 142.20 101.28

41.62

116.50

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