Page 10 • MN06150 ║ Issue/Rev. 0.7 (9/18)
Mechanical
1. Mount the microLoad.net using four (4) 5/16 - 18
bolts. See Figure 2 for mounting hole layout.
2. Attach the required conduit runs to the microLoad.
net. Be sure to plug all unused conduit entries.
3. In preparation for wiring, remove microLoad.net
cover/keypad/display. This is done by removing six
(6) cap screws, which hold the cover to the micro-
Load.net enclosure. Carefully pull the cover away
from the enclosure and unplug factory-installed
cables by removing the terminal blocks at the MNET
circuit board. Note the position of these connections
for reinstallation later.
4. Care must be taken in handling the microLoad.net
enclosure and cover to avoid scratching the ground
flange where they are assembled.
Electrical
1. AC circuits must be isolated from DC circuits and
brought into the unit through their respective conduit
openings.
ATEX / IECEx
Cable entry must be in accordance to EN/IEC
60079-1 section 13.
For wiring systems utilizing cable glands, the gland
and or thread adaptor must be Ex certified. The
cable end must be securely installed and, depend-
ing on the cable type, be properly protected from
mechanical damage.
For wiring systems utilizing conduit, an Ex certified
sealing device must be used immediately at the
entrance of the enclosure.
Any unused entry must be suitably blocked with an
Exd IIB IP65 Certified Plug for ATEX and IECEx
applications.
For North American Zone applications, the plug must
be listed metal close up type.
The maximum ambient temperature for the enclo-
sure is 60°C.
Equipment bonding shall be provided at the external
grounding facility terminal, external connection is not
required when using metallic conduit or armored ca-
ble. External grounding facility terminal wire range:
10-12 AWG (5.26 sq mm to 3.31 sq mm) wire.
Cover to body fasteners must be either DIN 912
grade 12.9 (alloy steel), DIN 912-A4-70 (316 stain
-
less steel), or DIN 912-A2-70 (18-8 stainless steel).
Keypad is protected by an intrinsic safe barrier, the
enclosure must be grounded as per national electri-
cal code regulations, for example NEC/CEC etc.
Battery back-up option (if equipped) use only ap-
proved AAA NiMH (1.2V/Cell Nominal) rechargeable
batteries meeting IEC 61951-2 requirements, IEC
Section III – Installation
IEC IEC Designation (IEC-HR03), with a maximum
capacity of 1.5 Ah at a 1 h discharge rate.
Caution:
To prevent ignition of hazardous atmo-
spheres, disconnect from supply circuit before
opening, keep tightly closed when circuits are in
operation.
Warning:
Contains internal battery-powered circuit,
to prevent ignition of hazardous atmospheres, do
not open enclosure unless area is known to be
non-hazardous.
Note:
Refer to page 42 for certification and marking information.
2. All signal and DC wiring should be connected before
connecting AC wiring.
3. Be sure all connections on the terminal blocks are
tight.
4. All exposed shields must be properly insulated to
prevent short circuits to other terminals or to the
chassis. The shield at the device (e.g., tempera-
ture device, transmitter, etc.) must be cut back to
the insulation and taped off. All shields should be
continuous. If splices are required, they must be
soldered and properly insulated.
If other communicating devices are used with the
microLoad.net, refer to the manual for that unit for
shielding information. Shields for other communi-
cating equipment should not be terminated in the
microLoad.net.
Note:
Shields must not be terminated at the earth ground lugs.
5. Sufficient slack should be provided for the wiring
in the microLoad.net to permit easy removal of the
boards. With sufficient slack, the terminal blocks can
be removed and laid back out of the way so that the
boards can be replaced without removing individual
wires.
6. There is an earth ground lug provided in the unit.
The wire from the lug should be connected to the
proper grounding point. See Pre-Installation Con-
siderations, page 4.
Note:
CENELEC approved microLoad.nets require that the
customer install ferrules (Aderendhulsen) per DIN 46 228 on
the grounding wires prior to installation into the grounding lugs.
7. Typical electrical installation diagrams are provided
in the following sections to show the microLoad.net
and ancillary equipment. Before wiring the ancillary
equipment, refer to its installation manual. Use the
installation diagrams in conjunction with the following
checklist to make all necessary connections to your
microLoad.net.
8. Reconnect all terminal blocks to their respective
positions on the MACF and MNET boards. These
terminals blocks are not “keyed”, therefore take
extreme care to be certain that terminal blocks are
returned to the correct position and are in the correct
orientation.
Summary of Contents for Smith Meter microLoad.net
Page 13: ...Issue Rev 0 7 9 18 MN06150 Page 13 Section IV Diagrams Figure 3 Opening microLoad net ...
Page 29: ...Issue Rev 0 7 9 18 MN06150 Page 29 Section IV Diagrams Figure 16 RS 232 Shared Printing ...
Page 30: ...Page 30 MN06150 Issue Rev 0 7 9 18 Section IV Diagrams Figure 17 RS 485 Shared Printing ...
Page 37: ...Issue Rev 0 7 9 18 MN06150 Page 37 Section IV Diagrams Figure 24 AC Digital Outputs ...
Page 40: ...Page 40 MN06150 Issue Rev 0 7 9 18 Section IV Diagrams Figure 26 Sample Application Worksheet ...
Page 41: ...Issue Rev 0 7 9 18 MN06150 Page 41 Section IV Diagrams Figure 27 Sample Application AC Wiring ...
