Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 130)

Chapter 6
Installation
6-6
WARNING: Hazard of electric shock or equipment damage exist
if drive is not installed correctly. The National Electrical Code
(NEC) and local codes outline provisions for safely installing
electrical equipment. Installation must comply with specifications
regarding wire types, conductor sizes, branch circuit protection
and disconnect devices. Failure to do so may result in personal
injury and/or equipment damage.
!
A main disconnect and lockout device with cabinet interlocks must be
provided by the user. This device must be wired in the isolation
transformer or reactor primary circuit. The device must be sized to handle
115% of the primary current plus any additional loads that are connected to
the control system. Proper branch circuit protection for the drive and
additional devices must be provided according to NEC and local codes.
IMPORTANT: Refer to Tables 6.R and 6.S for drive current ratings to aid
in properly sizing wire.
Wire Size and Type Wire sizes must be selected individually, observing all applicable safety
and NEC regulations. The minimum permissible wire size does not
necessarily result in the best operating economy. Due to the drive overload
capacity, the conductors for the transformer primary and secondary must be
sized (at a minimum) for 125% of the maximum rated motor current. The
motor armature conductors must also be rated for 125% of the full load
motor current. Motor field conductors should be run with no less than 14
gauge wire. The distance between the drive and motor may affect the size
of the conductors used.
Shielded type wire is recommended in control circuits for protection
against interference. A shielded wire is required for all signal wires. The
recommended conductor size must be a minimum of 24 AWG. The best
interference suppression is obtained with a wire having an individual shield
for every pair. Table 6.B provides a listing and description of cable types
and wiring recommendations. Figure 6.4 shows recommended cable
shielding.
Figure 6.4
Cable Shielding Recommendations
1241
1242
3682
3683
8271
8281
8291
8301
8311
8321
2 Conductor
Shielded Cable
2 Conductor Shielded Cable
Multi-Conductor Shielded Cable
with Individual Shielded Pairs
Shield
Shield
Shield
TE
TE
TE
Shield Connection