ITT CentriPro Manual De Instalación página 9

Maximum Cable Lengths in Feet to Limit Voltage Drop to 5% for 230 V Systems
Service Entrance to Controller
Controller Motor
Input HP
14 12
½ 366 583
¾ 279 445
1 226 360
230V
286
1½ *
1 PH
2 * *
3 * *
5 * *
Controller to Motor
Controller Motor
Input HP
14 12
½ 905 1442 2290 3306 5213 8276
¾ 690 1100 1748 2523 3978 6316 7884 9945
1 558 890 1413 2040 3216 5106 6375 8041
230V
1½ 445 709 1126 1625 2562 4068 5078 6406 8072
3 PH
2 324 516
3 241 384
5 * 235
① Reduce lengths by 13% for 200 V systems.
② Lengths in bold require 90º C wire.
The lengths in each of the Wire Sizing tables represent 100% of the allowable voltage drop when motor is
running at full load. When sizing wire, the voltage drop of each wire segment must be included. The total
must not exceed 100% of the allowable drop. Take for example a 1.5 HP motor with a distance from Service
Entrance to Controller of 100' and 500' between the Controller and Motor.
• Service Entrance to Controller = 100' of 10 AWG (100/455) = 22 % (455' is from the S.E. to
• Controller to Motor
If the distance from the Controller to Motor was 600' (600/709) = 85% + 22% = 107%, we would need to
use #10 wire for that segment, ex. 600/1126 = 53% + 22% (for 100' of #10) = 75% which is acceptable.
It is also acceptable to use different wire sizes for the Buried and Well sections of wire.
Table 5: Possible Combinations for TRANSDUCER, JUMPER AND SWITCH INPUT
Pressure
Scenario
Transducer
Constant
Connected
pressure operation
Level or pressure
Connected
switch control
* See description of Maximum Speed Switch and Motor Overload Setting Switch for their effect on Full Speed value.
Table 4: Wire Sizing
Copper Wire Size 75ºC Insulation Exposed to a Maximum of 50ºC (122ºF) Ambient Temperature ②
10 8 6 4 3
925 1336 2107 3345 4175 5267 6637 8364
706 1020 1608 2552 3186 4019 5065 6383 8055
571 824 1300 2064 2576 3250 4095 5161 6513 8201
455 657 1036 1644 2052 2589 3262 4111 5188 6533 8236 9710
331 478 754 1197 1495 1886 2376 2995 3779 4759 5999 7073 8455 9852
246 355 561 890 1111 1401 1766 2225 2808 3536 4458 5256 6283 7321
* 218 343 545 680
Copper Wire Size 75ºC Insulation Exposed to a Maximum of 50ºC (122ºF) Ambient Temperature ②
10 8 6 4 3
820 1184 1866 2963 3699 4666 5879 7410 9351
609 880 1387 2202 2749 3467 4369 5506 6949 8750
373 539 849 1348 1683 2123 2675 3372 4255 5358 6755 7964 9520
* Wire does not meet the N.E.C. ampacity requirement.
Shading indicates 40º C maximum ambient.
= 500' of 12 AWG (500/709) = 71 % (709' is from the Controller to
Total Drop (must be ≤ 100%)
Jumper
Position
Bottom
Bottom
Not Top
Top
2 1 1/0 2/0
858 1081 1363 1720 2165 2730 3219 3847 4483
2 1 1/0 2/0
Controller chart)
Motor chart)
93 %
Switch Controller
Input Status
Open Disabled
Closed Constant pressure
Open Disabled
Closed Run Full Speed*
3/0 4/0 250 300 350
3/0 4/0 250 300 350
Status Switch Status
Indicator
Solid Green
Blinking green if flow
else solid green
Solid Green
Blinking green
①
400 500
8343
5109 6348
400 500
Indicator
Solid Red
Off
Solid Red
Off
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