Section 2 • Installation Recommendations; Proper Wiring Sizing; Voltage Source - Emerson Vilter Vission 20/20 Operation And Service Manual

Section 2 • Installation Recommendations

Proper Wiring Sizing

• Always size wire gauges as specified by the National
Electrical Code (NEC) for electronic control devices.
• For improved noise immunity, install one size larger
wire gauge than the NEC requirement to assure am-
ple current-carrying capability.
• Never under size wire gauges.

Voltage Source

• Transformers block
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7
a large percentage
Figure 2-1. Vission 20/20 with Individual Transformer
Figure 2-2. EMI and Vission 20/20
Electromagnetic Interference (EMI). The Vilter
Vission 20/20
TM
trol transformer for the most reliable operation, see
Figure 2-1.
• Connecting the Vilter Vission 20/20
panels and central control transformers exposes the
Vission 20/20 to large amounts of EMI emitted from
the other devices connected to the secondary termi-
nals of the transformer. This practice should be avoid-
ed if possible, see Figure 2-2.
of
should be isolated with its own con-
TM
to breaker
2 – 1