Powered by Eaton Technology VSD Series Drives User Manual
LIT-1201828
For more information visit: www.johnsoncontrols.com 3-1
November 2009
Chapter 3 — Power Wiring
Guidelines
To ensure proper wiring, use the following guidelines:
● Use heat-resistant copper cables only, +75°C or higher.
● The input line cable and line fuses must be sized in accordance with the rated input
current of the unit. See Tables 3-2 and 3-5.
● Consistent with UL listing requirements, for maximum protection of the VSD Series
drive, UL recognized fuses type RK should be used.
● If motor temperature sensing is used for overload protection, the output wire size may
be selected based on the motor specifications.
● If three or more shielded cables are used in parallel for the output on the larger units,
every cable must have its own overload protection.
● Avoid placing the motor cables in long parallel lines with other cables.
● If the motor cables run in parallel with other cables, note the minimum distances
between the motor cables and other cables given in Table 3-1 below:
Table 3-1: Cable Spacings
● The spacings of Table 3-1 also apply between the motor cables and signal cables of
other systems.
● Maximum length of the motor cables is as follows:
– 1 – 2 hp 230V units, 328 ft. (100m); filters required on lead length ≥175 ft.
– All other hp units, 984 ft. (300m); filters required on lead length ≥200 ft.
Note: Lead lengths ≥500 ft. require sine wave filter for all voltages.
● The motor cables should cross other cables at an angle of 90 degrees.
● If conduit is being used for wiring, use separate conduits for the input power wiring,
the output power wiring, the signal wiring, and the control wiring.
● For Frame 4 installations, refer to conduit mounting requirements in Chapter 4.
Minimum Distance Between Cables in Feet (m) Shielded Cable Length in Feet (m)
1 (0.3) ≤164 (50)
3.3 (1.0) ≤656 (200)
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