Hit Products Logic 3 - Manual (Page 5)

The Logic is designed to allow for a 7 volt loss in the field wiring. By increasing
the wire size you decrease the voltage loss. The rule is the bigger the wire, the
smaller the voltage loss. Use only solid copper wire manufactured for Direct
Bury Applications. To calculate the voltage drop, use the charts on pages 18 and
19. For a maximum of one valve only operating simultaneously, the following
chart applies.
Total Length of Valves Operating Wire Size
Each 2 Wire Run Simultaneously Gauge MM
2
Feet Meters
0-2,500 0-762 1 Valve #14 2.5
2,500-5,000 762-1,525 1 Valve #12 4
5,000-7,500 1,525-2,286 1 Valve #10 6
Calculating Voltage Drop and Proper Wire Sizing
Figure the wire distance from the controller to the farthest valve. Find that
distance by adding the distances on the chart and subsequent voltage drops.
Add these voltage drops to figure the total voltage drop at that wire size. Should
the voltage drop exceed 7.0 volts, the next larger sized wire should be calculated
until the voltage drop is equal to or less than 7.0 volts. For multiple valves
operating simultaneously, you must calculate and add the loss at each valve.
See example 1 and 2 below.
Example 1
Chart 1
Logic to V1 (Valve 1)
1000´
Logic 1
To Valve 14 Ga
Table Voltage drop
from Chart
Controller
to V1 1000´@1
valve 1.290 V.D.
Total Voltage Drop 1.290 O.K. use 14 Ga
24 Volts less 1.290 = 22.71 Volts
CALENDAR ODD / EVEN
PRE WET / FERTIGATION
MASTER CLEAR
PROGRAM RECEIVER
FERTIGATION ON MASTER ON
.35 amps inrush charts Voltage Loss .25 amps holding chart Voltage Loss
Length 1 Valve 2 Valves 3 Valves 4 Valves Length 1 Valve 2 Valves 3 Valves 4 Valves
Wire Size 14 2.58 R factor Wire Size 14 2.58 R factor
100 0.181 0.361 0.542 0.722 100 0.129 0.258 0.387 0.516
200 0.361 0.722 1.084 1.445 200 0.258 0.516 0.774 1.032
300 0.542 1.084 1.625 2.167 300 0.387 0.774 1.161 1.548
400 0.722 1.445 2.167 2.890 400 0.516 1.032 1.548 2.064
500 0.903 1.806 2.709 3.612 500 0.645 1.290 1.935 2.580
600 1.084 2.167 3.251 4.334 600 0.774 1.548 2.322 3.096
700 1.264 2.528 3.793 5.057 700 0.903 1.806 2.709 3.612
800 1.445 2.890 4.334 5.779 800 1.032 2.064 3.096 4.128
900 1.625 3.251 4.876 6.502 900 1.161 2.322 3.483 4.644
1000 1.806 3.612 5.418 7.224 1000 1.290 2.580 3.870 5.160