IM 12D08N05-01E
3-4
<3. INSTALLATION AND WIRING>
6 X M20 glands
potentio-
merter
LCD
bracket
connector for (future) software
input
terminal
block
output
terminal
block
protective
shield
bracket
Note: This connector for software must be used
only by Yokogawa’ s service personnel.
Note: SC450G-A(D)-U
The enclosure is provided with stoppers instead of M20 cable glands for the unused holes. These
stoppers must be removed and replaced by FM approved conduit fittings in accordance with
good installation practice. Also see Appendix 7, Control drawing for FM approval.
Figure 3.4 Internal view of SC450G wiring compartment
3.2 Wiring
3.2.1 Preparation
Refer to figure 3.4. The relay contact terminals and power supply connections are under
the screening (shielding) plate. These should be connected first. Connect the sensor,
outputs and HART
®
communication connections last.
To open the SC450G for wiring:
1. Loosen the four front plate screws and swing open the cover.
2. The upper terminal strip is now visible.
3. Remove the screen (shield) plate covering the lower terminal strip.
4. Connect the power supply and contact outputs. Use the three glands at the back for
these cables.
WARNING
• Cables that withstand temperatures of at least 75 °C should be used for wiring.
• Wiring work should be performed to meet IP66 or higher requirements. Tighten four
front plate screws to 1.5 N·m torque.
• Use cables that comply with UL2556VW-1 or equivalent.
Содержание SC450G
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