Table of Contents
Advertisement
52 Planning the electrical installation
Additional US requirements
Use type MC continuous corrugated aluminum armor cable with symmetrical grounds or
shielded power cable for the motor cables if metallic conduit is not used. For the North
American market, 600 V AC cable is accepted for up to 500 V AC. For drives rated over
100 amperes, the power cables must be rated for 75
Conduit
Couple separate parts of a conduit together: bridge the joints with a ground conductor
bonded to the conduit on each side of the joint. Bond the conduits also to the drive
enclosure and motor frame. Use separate conduits for input power, motor, brake resistor,
and control wiring. When conduit is employed, type MC continuous corrugated aluminium
armor cable or shielded cable is not required. A dedicated ground cable is always
required.
Note: Do not run motor wiring from more than one drive in the same conduit.
Armored cable / shielded power cable
Six conductor (3 phases and 3 ground) type MC continuous corrugated aluminum armor
cable with symmetrical grounds is available from the following suppliers (trade names in
parentheses):
•
Anixter Wire & Cable (Philsheath)
•
BICC General Corp (Philsheath)
•
Rockbestos Co. (Gardex)
•
Oaknite (CLX).
Shielded power cables are available from Belden, LAPPKABEL (ÖLFLEX) and Pirelli.
Selecting the control cables
Shielding
All control cables must be shielded.
Use a double-shielded twisted pair cable for analog signals. This type of cable is
recommended for the pulse encoder signals also. Employ one individually shielded pair for
each signal. Do not use common return for different analog signals.
A double-shielded cable is the best alternative for low-voltage digital signals but single-
shielded twisted pair cable is also usable.
Double-shielded twisted pair
cable
Signals in separate cables
Run analog and digital signals in separate, shielded cables.
Never mix 24 V DC and 115/230 V AC signals in the same cable.
°
°
C (167
Single-shielded twisted pair
cable
F).
Advertisement
Table of Contents
