Omron ZEN Operation Manual page 58

Wiring
Wiring Power Supply and Input Lines
AC Power Supplies
!WARNING
!Caution
AC power supply
CPU Unit (AC power supply type)
• Twisted wires can cause shorts so never directly connect twisted
wires. Always connect a straight crimp terminal if using twisted
wires.
Insulated
sleeve
• Use a flat-blade screwdriver to tighten the terminal block screws.
Do not connect the isolated side (L) and the grounded side (N) in
reverse. Wire the L side to the AC input circuit.
Tighten the AC power supply terminals to a torque of 0.5 to
0.6 N·m. Loose screws can result in fire or faulty operation.
CPU Units with 100 to 240-VAC Power Supplies
• To prevent voltage drops due to starting currents and inrush cur-
rents in other devices, wire the ZEN power supply circuit sepa-
rately from other power circuits.
• When using more than one ZEN, to prevent voltage drops due to
inrush current and circuit-breaker malfunctions, it is recom-
mended 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.
Circuit
protector
Isolation
transformer
Bar terminal
Input device
Expansion I/O Unit (AC input type)
Section 2-2
Input device
35