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4.7 TESTING THE NETWORK WIRE CONNECTIONS
Using a digital ohms meter, test the resistance of the network cabling at the beginning of the network to be certain
there are no shorts and that the network resistance is within acceptable range, between 60 and 70 ohms. To do this, first
make sure all Pulse MD Units are not powered or unplugged from the network. Then place the leads of the test meter
on the two wires coming out of the network initiation module and read the ohms resistance.
If the ohms test shows resistance of significantly less than 60 ohms (50 ohms or less), there could be a short in the wiring,
or the network “initiation” and “termination” modules are not properly installed. A short is the opposite of an “open”
circuit or broken wire. That is, somewhere in the wiring the blue and white wires are coming into contact. The short must
be found and eliminated for the network to operate properly. For information on troubleshooting, see
Section 7.2.4
.
If the ohms meter reads around more than 70 ohms, it indicates that the circuit is open or that the initiation and
termination modules are not properly installed. This problem must be found and eliminated for the network to
operate properly. For information on troubleshooting, see
Section 7.2.3
.
In addition to ohms readings, troubleshooting for connection problems can be performed by plugging in the devices.
To confirm adequate impedance, plug in one device at a time while simultaneously reading the resistance on the
network. If plugging in a device drastically changes the ohms reading, stop and look for the problem. Note that when
performing this test all devices need to be with no power. For additional help and techniques to locate network
problems, refer to
Section 7
.
4.8 CONNECTING THE 24VDC POWER SUPPLY TO DEVICE WIRE LOOMS
Figure 25
shows the connection between the regulated 24VDC power supply and the 24VDC wire loom in the parlor.
For Pulse MD monitoring only, one power supply of 240W can support up to 96 Pulse MD units.
Table 1
shows the power and networking requirements for the different network and pulsator configurations. There are
many possible configurations for any given system. For example, a barn with a 2x12 configuration including pulsation
control would have two wire looms with 6 drops and two power supplies for each side of the parlor.
TABLE 1: PULSE MD POWER AND NETWORKING REQUIREMENTS
Total Power per stall
Max. Units on Power/CAN Loom
Pulsation Monitoring only
2.4 watt
96
Pulsation Moni Remote LED kit
3.2 watt
72
Pulsation Monitoring and control, HiFlo Evolution
Pulsator. Power saving disabled
32.4 watt
8
Pulsation Monitoring and Control, HiFlo
Evolution Pulsator. Power saving enabled*)
17.4 watt
16*
* Currently not available
