Watlow Silver Series EM - Manual (Page 7)

7 Watlow Silver Series OIT Installation Guide
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.
• Connect the control panel to earth ground using a copper
grounding rod close to the OIT and control panel.
Hinged doors on control panels do not provide a long-term electrical
connection to the rest of the enclosure. Corrosion develops over time and
prevents good electrical contact. For this reason, a separate wire braid
should be installed from the hinged control panel to the rest of the
enclosure.
For a more in-depth overview of ground wiring techniques, refer to
Technical Note #1027, “OIT Ground Wiring and Electrical Noise
Reduction,” which you can find in the Tech Notes section on the Maple
Systems website.
Connect OIT Chassis Ground to Control Panel
To reduce the possibility of electrical interference, connect the chassis
ground terminal of the OIT to a clean earth ground. If the control panel is
metal, make sure it is properly grounded. Then connect a short heavy-
gauge wire (#14 AWG) from the chassis ground terminal of the OIT to a
mounting bolt on the control panel door. The mounting bolt must have
good electrical contact to the control panel; scrape away any paint that
may be covering the panel to provide a good connection.
0600-0101-0000 Rev A