Spectrum Controls 1769sc-HART Modules - Manual (Page 25)

Chapter 3: Installation and Wiring
User's Manual 0300215-03 Rev. A
3-7
Before mounting the module on a DIN rail, close the DIN rail latches. Press the DIN rail
mounting area of the module against the DIN rail. The latches will momentarily open and
lock into place.
Section 3.6
Replacing a Single
Module within
a System
The module can be replaced while the system is mounted to a panel (or DIN rail). Follow
these steps in order:
1.
Remove power. See important note at the beginning of this chapter.
2. On the module to be removed, remove the upper and lower mounting screws from
the module (or open the DIN latches using a flat-blade or phillips-style screwdriver).
3. Move the bus lever to the right to disconnect (unlock) the bus.
4. On the right-side adjacent module, move its bus lever to the right (unlock) to
disconnect it from the module to be removed.
5. Gently slide the disconnected module forward. If you feel excessive resistance,
check that the module has been disconnected from the bus, and that both mounting
screws have been removed (or DIN latches opened).
NOTE: It may be necessary to rock the module slightly from front to back to remove it,
or, in a panel-mounted system, to loosen the screws of adjacent modules.
6.
Before installing the replacement module, be sure that the bus lever on the module to
be installed and on the right-side adjacent module or end cap are in the unlocked
(fully right) position.
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers on the
replacement module and the right-side adjacent module.
9. Replace the mounting screws (or snap the module onto the DIN rail).
Section 3.7
Field Wiring
Connections &
System Wiring
Guidelines
Consider the following when wiring your system:
General
•
Power and input wiring must be in accordance with Class 1, Division 2 wiring
methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in
accordance with the authority having jurisdiction.
•
Channels are isolated from one another by ±500 Vdc maximum.
•
Route field wiring away from any other wiring and as far as possible from sources of
electrical noise, such as motors, transformers, contactors, and ac devices. As a
general rule, allow at least 15.2 cm (6 in.) of separation for every 120V of power.
•
Routing field wiring in a grounded conduit can reduce electrical noise.
•
If field wiring must cross ac or power cables, ensure that they cross at right angles.
•
Provision shall be made to prevent the rated voltage being exceeded by the transient
disturbances of more than 40%.
•
The system shall be mounted in an ATEX certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in IEC60529 or EN60529 and
used in an environment of not more than pollution degree 2.
•
Earthing is accomplished through mounting of modules on rail.