Rockwell Automation 440R-D22R2, Руководство пользователя

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Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 17
Chapter
3
Power, Ground, and Wire
Wiring Requirements and
Recommendation
• Allow adequate space between the I/O wire ducts and the top and bottom
of the relays and front face to maintain an ambient temperature below
the rated operating temperature of the relays.
• Route incoming power to the relay by a path separate from the device
wiring. Where paths must cross, their intersection must be
perpendicular.
• Do not run signal or communications wiring and power wiring in the
same conduit. Route wires with different signal characteristics by
separate paths.
• Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
• Separate input wiring from output wiring.
• Label wiring to all devices in the system. Use tape, shrink-tubing, or
other more dependable means to label wire. Use colored insulation as
well to identify wiring by signal characteristics. For example, use blue for
DC wiring and red for AC wiring.
Wire Size
Each terminal accommodates copper wire with size from 0.2…2.5 mm2
(24…14 AWG). Use copper that withstands 60…75 °C (140…167 °F).
Terminal Torque
Torque terminals to 0.4 N•m (4 lb•in).
Terminal Assignments
Safety relays have four terminals: two on the top and two on the bottom. As
shown in
Figure 5 on page 18 , the X2 and X4 terminal markings apply to the
rear terminals. The X1 and X3 terminals apply to the front terminals.
ATTENTION: Before you install and wire any device, disconnect power to the
system.
ATTENTION: Calculate the maximum possible current in each power and
common wire. Observe all electrical codes that dictate the maximum
current allowable for each wire size. Current above the maximum rating
causes wiring to overheat, which can cause damage.