Scully ST-15C Series, Technical Manual

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9
2.0 INSTALLATION
The ST-15C control system is typically installed in areas that are classified as hazardous locations due to
nature of the products being loaded. Installation of the control unit and accessories must therefore be done
by qualified personnel in accordance with all national and local regulations (codes) governing the installation
of electrical equipment in hazardous locations.
It is essential that the ST-15C control unit and accessories be installed and used in accordance with the
detailed specifications and instructions in this manual.
Installations that violate national and local
regulations (codes) for installation of electrical equipment in hazardous locations and/or details in
this manual may lead to unsafe operation.
Intrinsically safe wiring to/from TB2 at the bottom of the control module must enter/exit the bottom
opening in the control unit enclosure labeled “Intrinsically Safe Entry”. Intrinsically safe wiring
must be kept physically separated from any other wiring.
2.1 Mechanical Installation
When choosing a location on the loading rack for the control unit, the lights on the front of the control unit
should be readily visible and within easy reach of the user. The control unit should be mounted vertically, in
a location where the cover can open for servicing. (See Diagram 61442 in Appendix 4.0 for installation.)
Refer to the Outline Drawing in Appendix 4.0 for physical dimensions, location of the mounting bolts,
electrical cable/conduit entry locations and enclosure earth bonding stud. The enclosure earth-bonding stud
is provided for proper electrical bonding (earthing) of the enclosure to earth (ground). Use only the three
conduit entry holes provided for wiring. The top two holes are for power and control wiring. The bottom hole
is for intrinsically safe sensor wiring only. Do not drill any additional conduit holes in the enclosure; doing
so violates the enclosure’s hazardous location approval and voids the warranty.
To avoid future maintenance issues regarding water infiltration into the enclosure via the electrical cable
entries, we strongly recommend the following precautions:
1. Minimize long vertical cable (or conduit) runs into the top of the enclosure as long vertical runs promote
water channeling to the cable gland.
2. The cable glands at the top of the enclosure should be very carefully installed, taking extra precaution to
make certain that the installation is proper and sealed (as required by code).
3. Must seal all enclosure cable gland entries to maintain IP65 rating and protect against water infiltration.
Install a fiber washer between the cable gland and the enclosure.
2.2 Electrical Installation
Refer to the Installation Wiring Diagrams in Appendix 4.0.
All cable entry fittings, junction boxes, connections, wiring, etc. are to be provided by the installer.
Explosion-proof cable glands should be employed for cable entry. If conduits are used for cable entry, seal
fittings must be installed in each conduit.
There are three holes in the enclosure for cable entry. Two holes in the top of the enclosure are for mains
power and control output wiring. One hole in the bottom of the enclosure, labeled “Intrinsically Safe Entry” is
for connection to sensors, via a Scully Sculcon Junction Box and Plug & Cable.
WARNING The electrical cable entry in the bottom of the enclosure marked “INTRINSICALLY SAFE ENTRY” must only be
used for wiring to the sensors (via plug and cable assembly). To maintain intrinsic safety, this cable entry must not be
used for any other wiring. DO NOT ROUTE MAINS POWER THROUGH THIS HOLE.