| Q: Can
the HLP-10 log other sensor / signal inputs in addition
to power? |
A: Yes,
The HLP-10 was designed to meet the needs of applications
requiring power AND other sensor/signal data acquisition
requirements. With the installation of optional Interface
Modules, the HLP-10 can accept up to 20 additional analog
/ digital signals from pressure, flow, temperature,
etc sensors as well as all of the standard process type
signals (0-5Vdc, 4-20mA, etc). |
| Q:
How does the HLP-10 interface to PSH's? |
A: The HLP-10
has a total of six internal ports into which Interface
Modules can be installed. Interface Modules expand functionality
of the HLP-10 for increased analog and digital inputs
and outputs, modem communication, additional memory
and more. The HLP-10 includes one HLIM-9B-001 Interface
Module which consumes one of the six available ports.
This single HLIM-9 module handles the communication
between the HyperLogger and up to 63 PSH's. With the
HLIM-9 installed (as the HLP-10 is delivered) up to
five more Interface Modules can be installed for additional
capability. |
| Q:
How many PSH's can I connect to an HLP-10 HyperLogger
PowerPlus data logging instrument? |
A: Up to 63 PSH's
can be connected to a single HLP-10. The PSH's are 'daisy-chained'
with a single twisted pair cable from the HyperLogger
to the first PSH, then on to the second PSH, etc. A
single 2-conductor twisted pair (with shield) cable
is used for the interconnect wiring. With this 'daisy-chain'
wiring system, multiple PSH's can be be connected to
a single HLIM-9 module installed in one of the HLP-10
Interface Module ports. |
| Q:
Can the PSH be used for measuring power on loads controlled
by variable frequency drives? |
A: Yes, however
it is critical that the PSH connections be made on the
line (i.e. the supply to the VFD) NOT the load side
(i.e. the output to the controlled load) of the Variable
Frequency Drive controller. Connecting the PSH on the
Load side of the drive will result in inaccurate readings
and may result in permanent damage to the PSH. |
| Q:
Can cable other than Belden 1120A be used for the communication
cable? |
A: Yes, if the
substituted cable meets the voltage insulation rating
of the application and the cable is approved by local
codes for the application. The UL listing on the PSH
was obtained with a stipulation that the 600Vac line
to line rated Belden 1120A communication cable is used.
As the PSH is rated for 480Vac applications, this cable
meets the insulation rating requirements for intallations
at 480Vac. In applications with lower voltages in the
electrical panel (eg 240Vac) a lower voltage rated cable
may be substituted (eg 300 Vac) providing that local
electrical codes, regulations and safety issues are
all met. |
| Q:
Does the PSH require excitation power to operate? |
A: No, the PSH
is powered from the voltage connections that are used
to sense line voltage. No additional power supply connections
are required. |
| Q:
Can the PSH be used for single phase 240VAC power measurements? |
A: Yes, for example
on a 240Vac single phase 3-wire configuration (two 120Vac
lines and a neutral) the third CT and voltage sense
lines are not connected. |
| Q:
How accurate are power readings from the HLP-10? |
A: The PSH performs
the current and voltage sensing, power calculations
and conversion of the power parameters into a serial
digital data stream which is communicated to the HLP-10
for recording. Hence the 1% accuracy specified on the
PSH (conforming to ANSI C12.1 metering standards) is
the final accuracy of the system. |
| Q:
I notice that two models of the PSH are offered, what
is the difference? |
A: Two main models
are offered, the 'Standard Output' version and the 'Enhanced
Output' version. The Standard unit outputs only KW and
KWH parameters. The Enhanced unit outputs 26 parameters
including KW, KWH, kVAR, kVA, Power Factor, and individual
line voltages, currents and power factors. In each of
these versions, different full scale current ranges
are also offered ranging from 100Aac to 2400Aac. |
| Q:
Can I log data from the PSH conditionally, for example
exceeding of a preset level? |
A: Yes, inputs
from the PSH are programmed for data collection and
alarming just like any other input signal (eg flow,
pressure, etc). During the programming sequence, icons
representing each of the power parameters available
within the PSH display on the screen. These icons can
then be graphically integrated into the HLP-10 program
with the standard HyperWare 'drag and drop' methods
used for programming of other 'hard-wired' inputs. Nothing
new to learn, just treat the icon like any other input
channel and perform level conditional, log on change,
or other intelligent logging and alarming strategies. |
