|
Preferred
AC Power System
To ensure that electrical noise produced by other equipment
does not create interference for the Aloha System Hardware,
all power conductors and equipment-grounding conductors
must be isolated from other power circuits in the facility.
To accomplish this, the preferred method of providing
power is the installation of a power distribution panel
intended for the sole use of the Aloha System Hardware.
This
dedicated power panel shall not be used to supply other
electrical loads in the facility. The panel will be
supplied by a feeder run directly from the main or
source panel for the facility.
Personal
Computers, and/or Stand-alone devices are to be powered
from a single circuit, All branch circuits shall include
a separate neutral (ground conductor) and equipment
grounding conductor unless otherwise indicated.
Notes
on the Preferred AC Power System:
Does not supplant national, state, or local electrical
codes. Each Branch Circuit shall be installed in a
dedicated ferrous metal conduit and have separate neutral
and ground conductors. Aluminum conduit is not acceptable.
If
the length exceeds 100 feet, increase all conductors
(including ground) one wire size for each additional
100 feet of length.
The neutral conductor from the main or source panel
to the dedicated Aloha panel is two sizes larger than
the phase conductors. The larger wire size is necessary
to accommodate the third harmonic current caused by
the switching power supplies in the Aloha User Workstations,
and to minimize the possibility of common mode noise
occurring on the power distribution circuits.
All power distribution circuits shall be installed
in a dedicated ferrous metal conduit that contains
only the Aloha supply and ground conductors. Data communication
cables shall be installed in separate ferrous metallic
conduits. All AC Power Receptacles shall be the isolating
ground type and shall be installed in accordance with
the specifications contained in the AC Power Receptacles
section.
Aloha
approved Uninterruptable Power Supplies (UPS) are required
for each Aloha System Processor (provided with the
Aloha equipment package).
AC
Power System Grounding
Proper grounding of the AC power system is critical
to achieve a high degree of equipment performance and
reliability- To minimize the introduction of electrical
noise, a separate equipment grounding system must be
installed. The specific grounding requirements are
outlined below.
ALOHA
Power Panel Grounding
An insulated equipment grounding conductor (sized the
same as the supply conductors) shall be installed in
the same conduit as the supply conductors from the
main or source panel to the dedicated Aloha POS equipment
panel. This equipment grounding conductor is to be
terminated on the ground bus in the main panel. At
the Aloha POS equipment panel, install a ground bus
that is electrically isolated from the panel frame
and terminate the feeder equipment grounding conductor
on this bus bar. The metallic feeder conduit will be
used as the equipment grounding system for grounding
the AC power panel frame, metallic conduit system and
metallic junction boxes.
ALOHA
Branch Circuit Grounding
Each branch circuit from the dedicated power panel
to the Aloha System Device receptacles shall include
a full size (same as supply conductors) insulated equipment
grounding conductor installed in the same conduit as
the supply conductors. The conduit must be dedicated
to Aloha equipment. This isolated grounding conductor
shall be terminated on the isolated ground bus bar
in the panel and on the equipment grounding terminal
of a NEMA IG5-15 isolated grounding type receptacle.
Alternate
AC Power System
For
existing construction where the existing facilities
do not justify the installation of a dedicated power
panel, an alternate method may be employed.
Notes
on the Alternate AC Power System:
Does not
supplant national, state, or local electrical codes.
This method will provide power for all Aloha System
Hardware Devices directly from the MAIN or SOURCE power
panel.When
using this method, it is imperative that no system
component be supplied from any power panel other than
the main or source panel.
All
Aloha System hardware and system processor(s) shall
be supplied with circuits run directly from the main
panel.
Each
branch circuit shall be installed in a dedicated ferrous
metal conduit and shall include a full sized (same
as the supply conductors) insulated equipment grounding
conductor installed in the same conduit. Aluminum conduit
is not an acceptable alternative to ferrous metal.
The isolated grounding conductors are to be terminated
directly at the ground bus in the main or source panel.
No grounding conductors shall be terminated on any
metallic conduit, water pipe, or ground rod.
All
AC Power Receptacles shall be the isolating ground
type and shall be installed in accordance with the
specifications contained in AC Power Receptacles section.
Aloha approved Uninterruptable Power Supplies (UPS)
are required for each Aloha System Processor (provided
with the Aloha equipment package).
Relaxed
/ Power Conditioned A C Power System
When providing the Preferred or Alternate AC Power
System is cost prohibitive and/or would require major
structural changes, we have defined a relaxed AC Power
System that may be used. However, the Preferred or
Alternate AC Power System is recommended by ALOHA.
The
Relaxed/Power Conditioned AC Power System
is described as follows:
Aloha-approved Power Conditioners are required at all
Aloha Remote Printer locations (will be provided with
the Aloha equipment package).
Aloha-approved Uninterruptable Power Conditioners (UPC)
are required at each Aloha Personal Computer.
All
Aloha AC Power branch circuits must originate from
the same "NonDedicated" Power Panel. This Panel must
be equipped with an "isolated" ground bus that is electrically
isolated from the panel frame and must be provided
with an insulated equipment grounding conductor (sized
the same as the supply conductors) which is installed
in the same conduit as the supply conductors from the
main or source power panel. The equipment grounding
conductor must be terminated on the ground bus in the
main or source panel and on the "isolated" ground bus
in the 'Non-Dedicated' Power Panel.
*
Any Power Panel supplying heavy equipment within the
facility should not be selected as the "Non-Dedicated"
Power Panel supplying the Aloha equipment.
*
Aloha AC Power Circuits must be "dedicated" for Aloha
equipment. No equipment other than Aloha Equipment
may be supplied by these "dedicated" circuits.
*
Aloha AC Power Circuits must also be installed in a
dedicated conduit system. No circuits other than Aloha
circuits may exist in this dedicated conduit system.
In addition, the conduit used for the Aloha AC Power
Circuits must be ferrous metallic. Flexible, rigid,
or greenfield metallic conduit is acceptable. Aluminum
conduit is not acceptable.
Each
"dedicated' Aloha AC Power circuit must include a M
size (same as supply conductors) insulated equipment
grounding conductor installed within the same "dedicated"
conduit system as the supply conductors. This ground
conductor must be terminated at the "isolated" ground
bus in the "NonDedicated" Power Panel, and on the grounding
terminal of each Isolated Ground AC Power Receptacle.
All
AC Power receptacles shall be the isolated ground type
and shall be installed in accordance with the specifications
contained in the AC Power Receptacles section.
AC
Power Receptacles
In order to maintain isolation of the equipment grounding
conductor from the conduit system, an isolated ground
receptacle must be used. This type of receptacle (usually
identified by an orange face) provides an insulating
barrier between the equipment grounding terminal and
the receptacle mounting strap. All branch circuits
from the Preferred, Alternate, and Relaxed/AC Power
Conditioned ALOHA power panel must be terminated with
isolated ground receptacles,
Standard
receptacles bond the equipment grounding terminal (green
screw) to the receptacle mounting strap and metallic
conduit when the receptacle is mounted to the box.
This defeats the purpose of the isolated grounding
system. No equipment bonding jumper is to be installed
from the receptacle grounding terminal to the outlet
box.
NOTE:
NEC Article 250-74, Exception 4 permits installation
of the isolated ground receptacles and isolated equipment
grounding conductors specified in this section.
If
a duplex receptacle is installed and only one socket
is to be used, the unused socket should be disconnected.
This is to prevent the temptation of using the outlet
for equipment that may produce extraneous ground currents
(e.g., floor buffers, vacuum cleaners, etc.). The correct
receptacle types are listed below.
Isolated
Ground Receptacles RECEPTACLE TYPE NEMA P/N 125V.,
15A., Simplex IG5-15RI 125V, 15A., Duplex IG5-15R2
Email
support questions to support@abacus-pos.com
|
