Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 108)

Publication GMC-RM001A-EN-P — July 2001
A-6 Noise Control Supplement
Method
• Both 24V dc commons were grounded to the panel (refer to
Figure A.4).
• 500mm parallel wire runs were set up at varying distances apart
(separation) and different heights above the panel (wire to panel).
• Peak voltages were measured on the victim wire referenced to the
panel.
Figure A.4
Wire segregation test set-up
Results
The results of the segregation testing is shown in the table below.
Wire to
panel
Victim
wire
Source
wire
Steel wall
Separation
Plated steel panel
Source and Victim
Separation:
Wire to Panel Separation:
3.0 mm (0.1 in.) 3.0 mm (0.1 in.) 3.0 mm (0.1 in.) 40 mm (1.6 in.) 40 mm (1.6 in.) 40 mm (1.6 in.)
24V dc Resistive
Load 24V dc Contactor 240V ac
Contactor
24V dc Resistive
Load 24V dc Contactor 240V ac
Contactor
3mm (0.1in) 500mV 10V 10V 500mV 20V 20V
25mm (1in) 100mV 500mV 200mV 100mV 5V 2V
50mm (2in) 100mV 200mV 200mV 100mV 2V 2V
100mm (4in) 100mV 200mV 200mV 100mV 1V 1V
200mm (8in) 100mV 100mV 100mV 100mV 200mV 200mV
3mm + Steel wall 100mV 500mV 100mV 100mV 500mV 500mV
25mm + Steel wall 100mV 100mV 100mV 100mV 500mV 200mV