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2.6 Mounting Procedures
Mounting hole dimensions for the standard enclosures are shown in Appendix B on page 63. If
possible, conduit entries should be made in the bottom of the enclosure to reduce the possibility
of water entry or leakage. Conduit entries must be drilled/punched following the enclosure man-
ufacturer’s recommendations. Use bushings suitable for the enclosure type and install such that
the completed installation remains waterproof. Grounding hubs and conductors must be
installed in accordance with Article 501-4(b) of the National Electrical Code and Part I of the
Canadian Electrical Code.
The user may want to consider enclosure drain holes in applications where moisture is a prob-
lem; drill 0.125" holes in the bottom of the enclosure on both the left and right sides. Two holes
reduce the possibility that one will plug and ensures drainage if the enclosure is not perfectly
level. Note that drilling holes in the enclosure compromises the NEMA 4 rating. Controllers
should be removed from the enclosure before any holes are drilled or cut to prevent damage due
to flying debris.
2.6.1 CONTROL MODULE INSTALLATION AND REMOVAL
Caution: Always ensure that the power to the unit is turned off during installation or removal to
avoid the risk of injury and damage to the controllers.
Warning—Explosion Hazard! Do not install or remove the control module while the unit is
powered.
Fig 2.1 Control module installation
The 920 series controller is designed to be mounted to a flat back plate/panel using a terminal
board. This plug-in design simplifies installation and maintenance by allowing all of the low-
voltage field wiring to remain undisturbed while a control module is installed or removed.
Installation of the control module is easily accomplished by plugging it into the connector on the
terminal board.
• The module is fully inserted once its rear cover is flush to the top surface of the terminal
board. The connectors are designed to be self-aligning, so no undue force should be
required.
• Next, secure the module using the two captive screws provided (one located on each side of
the rear cover). These should thread easily into the terminal board. Be sure to align the
screws properly to avoid cross-threading them.
To remove the control module, loosen the two captive screws. Once they have been completely
loosened, they will float freely in their respective retaining collars without falling out. The module
may now simply be pulled straight out of its connection.
2.6.2 OPERATOR CONSOLE INSTALLATION AND REMOVAL
The operator console is designed to be easily installed or removed while the controller is pow-
ered—even in Class I Division 2 and Zone 2 hazardous areas. It may be temporarily or perma-
nently installed.
The console is installed in three steps:
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