Watlow Silver Series OIT - Manual (Page 5)

5 Watlow Silver Series OIT Installation Guide
0600-0069-0000 Rev D
Control Panel Design Guidelines
Pay careful attention to the placement of system components and
associated cable routing. These items can significantly enhance the
performance and integrity of your control application.
Figure 1: Typical Panel Layout
Control Panel Grounding
The control panel must be connected to a good, high-integrity earth
ground both for safety considerations and shielding purposes. Maple
Systems cannot overemphasize the importance of good grounding. If
you fail to use good grounding procedures during installation, sporadic
malfunction of the OIT may occur:
- Connect the OITs chassis ground terminal to a reliable earth
ground with a low-resistance path.
- Route all earth ground wires that lead from the OIT, the PLC, the
power supply, and the line filter to a central earth ground point
such as a barrier strip. This will ensure that no ground current
from one device influences the operation of the other devices.
- Connect the OIT chassis ground terminal to the control panel
door using a heavy-gauge short braided cable or ground wire to
minimize resistance.
- Connect the power cable’s shield wire to the OIT’s chassis
ground terminal.