Installation manual

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)
Power Cable
AWG
Cross Section
(mm
2
)
4 + 4
400
13 + 13
2.5 + 2.5
6 + 6
600
10 + 10
4 + 4
8 + 8
800
10 + 10
6 + 6
10 + 10
1000
10 + 10
10 + 10
12 + 12
1200
8 + 8
10 + 10
14 + 14
1400
8 + 8
16 + 16
16 + 16
1600
6 + 6
16 + 16
20 + 20
2000
6 + 6
16 + 16
Transformer Specifications
Power supply transformers:
 Must have CE approval
 Must be double-insulated and equipped with suitable protective circuit breakers
(type C6)