Johnson Controls York Smart Equipment SC-EQ, Руководство по установке

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JOHNSON CONTROLS
11
FORM 450.50-N1
ISSUE DATE: 08/19/2019
2
SECTION 2 - INSTALLATION
to the SC-EQ Comm Card. For the line voltage power
source, use a dedicated line (with a separate fuse) that
is isolated (using a control transformer) from other
equipment in the plant room that may generate Elec-
tromagnetic Interference (EMI).
Grounding
For the enclosure style, a ground wire must be connect-
ed directly to the enclosure supply power ground lug at
the point of entry. A label (
Figure 1 on page 11
) iden-
tifies this grounding point. This ground wire should be
connected through a continuous ground circuit to the
incoming ground at the source transformer.
LD20000
GRD
FIGURE 1 - GROUNDING LABEL
Besides providing safety protection, the
ground connection plays an extremely
important part in the operation of the
communication circuitry.
Risk of Electric Shock. Ground the
SC-EQ Enclosure according to local, na-
tional, and regional regulations. Failure
to ground the SC-EQ Enclosure may re-
sult in electric shock and severe personal
injury or death.
PROTECTION OF COMMUNICATION PORTS
When using RS-485 technology, it is possible that elec-
trical disturbances, such as voltage spikes, can damage
a circuit board. The SC-EQ Comm Card includes reset-
table fuses and other devices on each RS-485 port to pro-
tect against damaging electrical spikes and stray voltage.
The equipment panel should also be equipped with pro-
tection against electrical disturbances. Whereas OptiView
Micro Panels are equipped with onboard tranzorbs, other
equipment panels may require the addition of an external
board. Refer to the equipment documentation for details.
The BAS Port J12 of the SC-EQ Comm Card is also elec-
trically isolated, providing a means of mitigating common
mode voltage induced problems.
The SC-EQ is supplied as a circuit board that can be
installed directly into the equipment’s enclosure, or can
be supplied pre-mounted in an enclosure ready for line
voltage. Accessory mounting kits are used to mount the
SC-EQ Comm Card directly into OptiView, Latitude,
and IPU-II based Micro Panels.
IMPORTANT: Do not install the SC-EQ Comm Card
directly into an equipment’s enclosure without the use
of an approved installation kit.
WIRING
Risk of Electric Shock. Disconnect
or isolate all power supplies be-
fore making electrical connections.
More than one disconnect or isola-
tion may be required to completely
de-energize equipment. Contact with
components carrying hazardous voltage
can cause electric shock and may result
in severe personal injury or death.
Risk of Property Damage. Do not apply
power to the system before checking all
wiring connections. Short circuited or
improperly connected wires may result
in permanent damage to the equipment.
IMPORTANT:
Make all wiring connections in accor-
dance with local, national, and regional regulations.
Install the wiring so it does not cause a hazard, and
is protected against electrical and mechanical damage.
Power
The SC-EQ circuit board is powered from either a 12
VDC, or a 24 VAC, Class 2 power source. When used
with an OptiView chiller, the Micro Panel supplies
low-voltage power via a power harness supplied by the
OptiView installation kit. If the SC-EQ circuit board
is installed in its own enclosure, a transformer is in-
cluded in the enclosure. Line voltage may be supplied
using an external power source, or drawn from the in-
put voltage terminal strip inside the chiller panel. Be
sure the capacity of the power conductors supplying
the equipment is rated for the additional power (VA)
required by the SC-EQ Comm Card. Use a wire that
is one size larger than required for the amperage draw
(maximum 400 mA) to connect the line voltage feed