Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 User Manual

Page 70

Chapter 4
Installation

4-5

Table 4.A
Cable and Wiring Recommendations

Category

Power

Control

Signal

(Process)

Signal
(Comm)

Wiring
Class

Signal Definition

AC Power (600V or greater)

AC Power (less than 600V)

DC Power

115VAC/DC Logic

115VAC Power

24VAC/DC Logic

Analog Signals,
DC Supplies

Digital (low speed)

Digital
(high speed)

Serial
Communication

Serial Communication
(greater than 20k baud)

Signal Examples

2.3kV 3/Ph AC Lines

460V 3/Ph AC Lines

DC Motor Armature

Reg. DC Motor Field

Relay Logic/PLC I/O
Motor Thermostat

Power Supplies,
Instruments

PLC I/O

Reference/Feedback
Signal, 5 to 24VDC

TTL

I/O, Encoder, Counter
Pulse Tach

RS-232, 422 to
Terminals/Printers

PLC Remote I/O,
PLC Data Highway

Cable Type

per NEC & Local Codes

Shielded Cable – Belden
8735, 8737, 8404

Shielded Cable – Belden
9728, 9730

Shielded Cable – Belden
RS-232 – 8735, 8737
RS-422 – 9729, 9730

Twinaxial Cable – Belden
9463, A-B 1770-CD

3/9

3/
18

2/3/4

3/9

3/6

3/
12

5/6

3/9

3/6

3/9

7/8

3/18

3/12

3/9

9/10/11

Note6

Note 6

1/3

Spacing
Notes

1/2/5

Minimum Spacing in Inches between Classes –

Steel Conduit/Tray

Example:

Spacing relationship between 480VAC incoming power leads and 24VDC logic leads.

– 480VAC leads are Class 2 ; 24VDC leads are Class 6
– For separate steel conduits, the conduits must be 3 inches (76 mm) apart
– In a cable tray, the two groups of leads are to be 6 inches (152 mm) apart

Spacing Notes:

1. Both outgoing and return current carrying conductors are to be pulled in same

conduit or laid adjacent in tray.

Cables of the following classes can be grouped together.

Class 1; Equal to or above 601 volts.

Classes 2,3, and 4 may have their respective circuits pulled in the
same conduit or layered in the same tray.

Classes 5 and 6 may have their respective circuits pulled in the
same conduit or layered in the same tray.
NOTE: Bundle may not exceed conditions of NEC 310.

Classes7 and 8 may have their respective circuits pulled in the
same conduit or layered in the same tray.
NOTE: Encoder cables run in a bundle may experience some amount of
EMI coupling. The circuit application may dictate separate spacing.

Classes 9, 10 and 11 may have their respective circuits pulled in the
same conduit or layered in the same tray.
Communication cables run in a bundle may experience some amount of
EMI coupling and corresponding communication faults. The application
may dictate separate spacing.

3. All wires of class 7 through 11 MUST be shielded per the recommendations.

4. In cable trays, steel separators are advisable between the class groupings.

5. If conduit is used, it must be continuous and composed of magnetic steel.

6. Spacing of communication cables to classes 2 through 6 is:

CONDUIT SPACING

THROUGH AIR

– 20A – 3 inches

6 inches

20A

3 I 3

100KVA – 6 inches

12 inches

I > 100KVA – 12 inches

24 inches

General Notes

1. Steel conduit is recommended for all wiring classes. (Classes 7-11).

2. Spacing shown between classes is the minimum required for parallel runs

less than 400 feet. Greater spacing should be used where possible.

3. Shields for shielded cables must be connected at one end only. The other

end should be cut back and insulated. Shields for cables from a cabinet to an
external device must be connected at cabinet end. Shields for cables from
one cabinet to another must be connected at the source end cabinet.
Splicing of shielded cables, if absolutely necessary, should be done so that
shields remain continuous and insulated from ground.

4. Power wire is selected by load. 16AWG is the minimum recommended size

for control wiring.

2/3/4/5

Note 6

1/3