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Wiring Section 2-2
2-2-4 Wiring CPU Units with AC Power Supplies
■ Wiring the CPU Unit Power Supply
• To prevent voltage drops due to starting currents and inrush
currents in other devices, wire the ZEN power supply circuit
separately from other power circuits.
• When using more than one ZEN, to prevent voltage drops due to
inrush current and circuit-breaker malfunctions, it is
recommended that each one is wired separately.
• To prevent the influence of noise from power lines, twist the
power lines. Wiring via a 1-to-1 isolation transformer is also
effective.
• Use wires that are thick enough to allow for voltage drops and
current variations within the allowable range.
• Include a circuit protector or breaker installed separately from
other circuits in the power supply circuit for the ZEN.
Power Supply and Input Circuits
CPU Units and Expansion I/O Units with 10 I/O Points
L N
Circuit
protector
Input device
Input device
Expansion I/O Unit
(AC input type)
AC power supply
Isolation
transformer
CPU Unit (AC power supply type)
L N IN0 IN1 IN2 IN3
L N NC I0 I1 I2 I3 I4 I5
100 to 240 VAC, 50/60 Hz
LN
Circuit
protector
Input device
CPU Unit with 10 I/O points
ZEN-8E1AR Expansion I/O Unit
(AC input type)
Z211-E1-03.book Page 41 Friday, November 21, 2008 10:38 AM
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