
May 2009 AfiFree Terminal 155i Installation Manual 31
Electrical requirements has the following parts:
Power Supply Requirements (page 31)
Wiring Requirements (page 32)
Grounding Requirements (page 32)
Power Supply Requirements
For a basic parlor installation (AfiFree155i milk meters and cluster removal pistons,
without additional outputs), the power supply must meet the following requirements:
24 ± 2.4 VAC power supply, 50 VA to each milking point
24 ± 2.4 VAC power supply, 75 VA to the wash controller
Table 5 specifies the power requirements for installations with different quantities of
AfiFree155i milk meters.
SAE recommends the use of a separate transformer and separate 24 VAC wiring for
each side of the milking parlor, for two reasons:
If one transformer fails, the second side of the parlor remains operational
Troubleshooting is easier
In installations using the Plug-in Wiring System, AfiMilk recommends using one
1,000 VA transformer for up to 18 stalls.
Table 5: Power Cable Specifications and Minimum Power Requirements
Number of
AfiFree155 Milk
meters
Minimum Power
Required
(VA)
Transformer Specifications
Power supply transformers:
Must have CE approval
Must be double-insulated and equipped with suitable protective circuit breakers
(type C6)
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