Rockwell Automation 8720MC High Performance Drives Installation Manual User Manual
Page 27
Publication 8720MC-IN001D-EN-P — December 2002
Installing Your 8720MC Drive
1-15
• The clean zone (C) is beneath and left of the 8720MC and includes
the P1 and P4 connector wiring (grey wireway).
• One dirty zone (D) is right of the 8720MC and includes motor
power and the P5 connections (black wireway). Another dirty
zone is below and right of the 8720MC-RPS and includes fuses,
contactors, circuit breakers, and the VAC input to the AC (EMC)
line filter.
• The very dirty zone (VD) is beneath and right of the 8720MC and
includes the DC bus wiring, AC input from the line filter,
8720MC-RPS, line reactor, varistor, and harmonic filter. Shielded
cable is required only if the very dirty cables enter a wireway.
• The SERCOS fiber optic cables are immune to electrical noise.
Figure 1.6
Establishing Noise Zones (Common Bus Configuration with 8720MC-RPS)
1
For examples of shield clamp attachment, refer to the System Design for Control of Electrical Noise Reference
Manual (publication GMC-RM001x-EN-P).
2
If necessary, the AC line filter may be moved ahead of the input contactors and fuses. However, it is important to
segregate the very dirty wiring between the filter and drives and keep as short as possible to prevent noise
coupling into susceptible circuits.
(1)
C
C
D
VD
D
C
D
REGENERATIVE POWER SUPPLY
REGENERATIVE POWER SUPPLY
8720
MC
RST PRG ENT
READY
READY
FAULT
FAULT
PROGRAM
PROGRAM
kW
kW
V
A
VD
VD
D
P1
P4
P5
TB1
8720MC
B Frame Chassis
Dirty Wireway
Clean Wireway
Route 24V dc I/O
Shielded Cable
Varistor
Dirty Wireway
8720MC
Regenerative
Power Supply
(8720MC-RPSxxx-BM-HV1)
Shield Clamp(s)
1
Route Encoder/Analog/Registration
Shielded Cable
Motor Power
Shielded Cable
Keep very dirty connections as short as
possible and segregated (not in wireway)
Line
Fuses
Contactors
Shield
Clamps
Circuit
Breaker
8720MC
Line Reactor
Harmonic
Filter
DC Bus /
≤ 2 m (78.7 in.)
AC
Line Filter
2