AfiMilk MPC 3 - Power Supply Transformers

AfiMilk MPC Installation Manual 38
Chapter
5
Power System
Power Supply Transformers
Use isolating transformers. A principle electric
drawing of such recommended transformer is
illustrated here.
Install the power supply transformers as close as
possible to the milk meters. If long cables run between the transformers and the milk
meters, consider higher cable gage than originally suggested.
Connect the mains input to the transformer directly. Do not connect additional loads
(receiver vessels for example) on the same source cable used to feed the milk meter
transformer.
In medium and large size parlors, afimilk recommends installing separate power
assemblies (transformers and main 24Vac wiring) for each side of the milking parlor for
these reasons:
o If one transformer is not functional, the second side of the parlor remains
operational.
o Troubleshooting is easier.
The following table specifies the requirements for transformers and cables width in
different sizes of parlor.
Transformer and Cable Requirements
No. of Milk
Meters in the
parlor
Power Required
(V/A)
Recommended
Transformer
Power Cable
(AWG)
Power Cable
(mm2)
4 - 8 600 600 13 + 13 2.5 + 2.5
10 -12 900 2 x 450 10 + 10 4 + 4
14 - 16 1200 2 x 750 10 + 10 6 + 6
18 - 20 1500 2 x 750 10 + 10 10 + 10
22 - 24 1800 2 x 1000 8 + 8 10 + 10
26 - 28 2000 2 x 1000 8 + 8 16 + 16
30 - 32 2400 2 x 1200 6 + 6 16 + 16
34 - 40 3000 2 x 1500 6 + 6 16 + 16