Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 118)

Publication GMC-RM001A-EN-P — July 2001
A-16 Noise Control Supplement
Noise Checklist Use the following checklist to ensure that the number of potential
noise sources in your system is reduced and that the noise sensitive
components are not affected by the remaining noise.
System Identification:
Checked by:
Date:
Chapter Title Technique Done
2
High Frequency (HF)
Bonding
Zinc plated panels, bonded together top, middle, bottom
Panels bonded to machine structure by continuous low impedance paths
3
Segregating Sources and
Victims
Components segregated into Clean, Dirty and Very Dirty zones
Wiring segregated using color coded wireways with added shields, if
required
Wiring loops avoided
Wire run around the clean zone wireway to monitor for noise
4
Shielding Wires, Cables,
and Components
Additional shields between closely spaced zones
All clean signal cables shielded where appropriate
Shields grounded both ends at their circular cross section
5 Filtering Noise
EMC filters fitted adjacent to PWM loads
DC filters fitted where low voltage DC power crosses between zones
6 Contact Suppression All contact-switched loads suppressed
7 Power Distribution
Grounded DC power commons
De-coupled DC power at clean loads
8 Motor Wiring
Shielded cable for all VS motor power, grounded at both ends
Cable joints minimized (direct drive/motor preferred). Bulkhead connectors or
shielded junction boxes used.
9
High Speed Registration
Inputs
Shielded cable grounded to detector body and main panel
Clean power supply
10 Encoders
Shielded cable grounded to detector body and main panel
Clean power supply
11
Measuring Noise
Reduction Effectiveness Measure initial noise levels on DC distribution lines and install monitor wires
for periodic checks and recording