Installation manual

32 Chapter 2 Site Preparation Requirements P/N 9040322
 Must supply power only to the AfiFree155i milk meters and to outputs operated
by the AfiFree155i milk meters
 Do not connect either the secondary winding of the transformer or any of the
loads to ground
Wiring Requirements
The power cables must be of sufficient size to carry the load without causing a
voltage drop from the first to the last milking point. Table 5 (page 31) specifies the
power cables requirements for installations with different quantities of AfiFree155i
milk meters. The table assumes a basic parlor installation (AfiFree155i milk meters
and cluster removal pistons, without additional outputs).
Table 6 shows the required specifications for solenoid wiring and communication
wiring to the AfiFree Connection Box.
Table 6: Specifications for Wiring Connected in Control Box
Cable
From
Type
Notes
Communication
P8 Connector
Cable
2-wire Twisted 2x0.75 mm
2
(2x18 AWG)
Impedance 100–
120Ω
Solenoid
Removal and
Vacuum Solenoid
2-wire double insulated
2x0.75 mm
2
(2x18 AWG)
Grounding Requirements
The AfiFree155i milk meter does not require grounding.
Computer Requirements
The AfiFree155i milk meters connect to the computer with the AfiSheep/AfiGoat
software. They require:
 AfiSheep/AfiGoat version 3.06 or higher
 One RS485 port on AfiCom1 or AfiHub