Asco Froment SIGMA IHT Version 4 User manual

Froment
SIGMA IHT Version 4 - Quickstart Guide

This Quickstart guide, along with the in-built help, will help
you get the best out of your Sigma IHT.
The Sigma Intelligent Hand-held Terminal (IHT) provides full load
control and three-phase instrumentation on any Froment Sigma-
equipped load bank.
1. Connect up to the load bank
Keep people well away. Close all doors. Ensure cables and
earthing are adequate. Risks include re and burns from the hot
air outlet and electric shock.
Before you can start using the IHT to test the supply, the load
bank and supply must be cabled up.
• After connecting the power cables between the load
bank and supply, ensure the IHT is plugged into the Load
Bank IN socket.
• Ensure that the supply on test is operational and any
circuit breakers are closed.
• Power-up the Load Bank control circuit.
Both the load bank ‘Stop’ and ‘Start’ lamps will light up. After
about 15 seconds the ‘Start’ lamp will go out, you can now press
the ‘Start’ button.
If you look at the IHT you will briey see the start-up logo and,
assuming all is well, the SETTINGS page with the SUPPLY ON
TEST details will be nally displayed.
The top line of the screen is the status line. This always displays
where you are (such as SETTINGS, TEST or OPTIONS) and
what page you are on. So SETTINGS 1-2, shows that you are in
settings on page 1 of 2. The bottom line displays the function key
labels. This indicates the purpose of the function keys F1 to F4.
2. Help
It is quite possible that when you pick up the IHT for the rst
time you will see the SUPPLY ON TEST help page.
Help is displayed automatically on the settings and test pages
after 12 seconds with no activity. This automatic help will only
be displayed once.
• You can press the Up and Down function keys (F1 and F2)
to scroll through the help.
• Press OK (the F4 key) when you have nished.
A HELP function key is available which provides context sensitive
help for all messages and options pages.
3. Set the Supply Size
You need to set the details of the supply on test before
applying any load.
The SUPPLY ON TEST details on the rst SETTINGS page are
used to calculate percent load and to avoid over-loading the
supply. A warning symbol is displayed if the load bank may not
be large enough to test the supply.
When in SETTINGS you can press the +and –keys to quickly
change the screen contrast.
• Press NEW from SETTINGS.
By pressing NEW the voltage, frequency and number of phases
will be set automatically using the measured values. The supply
size (kVA) can then be edited.
The supply must be present on the load bank bus-bars for the
automatic setting to work. Note that the NEW function is not
available when load is applied (the green LED illuminated).
Use EDIT if you want to manually change the supply details.
Read the load bank manual before use and take
special note of all the safety warnings.
Froment
Sigma IHT Version 4 - Quickstart Guide

• Press either PRESET or use the +and –keys to set the size
of the supply in kVA.
HELP provides further information on each selected item. You
can press SELECT to change between kVA, Power Factor, V, Hz
or Phase.
• When the supply size is set correctly press OK.
You are now ready to start load testing, so:
• Press TEST (now turn over and look at section 5 Apply
Load).
4. Settings and Options
Press PAGE, when in SETTINGS, to view the second page.
From the second SETTINGS page you can look at the load
bank capacity or change OPTIONS.
CHECK will search for any new load banks and reset any load
bank errors.
There are ve options pages that control how your IHT system
looks and works.
• Press OPTIONS
• The options are enabled or disabled by pressing the +
and –keys.
You can press HELP for further information on the selected item
or press SELECT to change between items. Press PAGE to change
to the next page.
• When nished press OK to go back to SETTINGS.
• Then press TEST, to start testing
The OPTIONS are automatically saved so you only need to set
them once.
5. Apply Load
There are four TEST pages; which offer different views of the
instrumentation. When you select TEST for the rst time the
following page is displayed.
You can select and apply load on any of the four TEST pages
in the same way.
• Select the required load using the +and –keys. By default
load control is in percentages. The screen will change to
show the load selected pop-up.
Pressing the SELECT key changes between load control in %, kW
or kVA and power factor. If a resistive-only load bank is used, then
the selection will be % and kW only.
• Apply the load by pressing the green l key. The load
selected pop-up will disappear and the green LED on the
IHT will light up.
The selected load pop-up will disappear after 3 seconds or when
another key is pressed, but selected load is always displayed on
the right of the status line.
Froment
Sigma IHT Version 4 - Quickstart Guide

Each time you press I, load correction will ensure you get the
exact load requested. Load correction can be enabled and
disabled from OPTIONS.
• Load can be removed at any time by pressing the red O
key.
The rst TEST instrumentation page shows the real-time Voltage
and Frequency in large fonts, together with the power in kVA, cos
φand kW. Along the top, the Status line shows that we are in
MANUAL, and 4 minutes and 32 seconds has elapsed since the
last load accept. The selected load is displayed on the top right of
the status line.
Use this page when initially adjusting the AVR and governor
settings.
6. View the Instrumentation
• Press PAGE to change to the next instrumentation page.
After four presses of PAGE you will be back to page one.
The next two TEST pages shows all the true rms three phase
measurements of Voltage (V), Frequency (Hz), Current (A),
Power (both kW and kVA) and Power Factor (Cos φ).
The second and third instrumentation pages provide all the
electrical data required when full-load testing. Displayed on
the right are the voltage and frequency; below each are the
maximum and minimum values for the last load change.
Note that page two shows line-line voltages, whereas page three
shows line neutral voltages.
The fourth TEST page provides a graphical view of the voltage
and frequency when the last load was applied.
The voltage and frequency graphs display the rst 6 seconds of
the last load change, as a percentage of the supply voltage and
frequency rating.
Use this page when testing governor and AVR transient response.
7. Using Automatic Load Control
At any time you can change between manual and automatic
load control.
• Press AUTO for automatic load control. Press F2 again to
return to MANUAL.
• A pre-programmed sequence of up to 16 loads can set
up by pressing the EDIT TEST key.
Again, use the +and –keys to change the selected value. Press
SELECT to select either %, cos φor time.
Pressing NEXT moves down to the next line. You can press COPY
to copy the selected value down to the next line.
• Press OK to exit EDIT TEST.
• Pressing the green l key will start the sequence.
• Load can be removed, and the automatic sequence stopped,
by pressing the red Okey.
The status of the automatic test is shown on the right of the
status line.
Any sequence that is running will be paused if MANUAL, EDIT
TEST or SETTINGS are pressed. Pressing I will restart a paused
load sequence.
Whilst the test is running the +and –keys can be used to
quickly override the selected load. Press I to apply the new
load selected.
Froment
Sigma IHT Version 4 - Quickstart Guide

N J Froment & Co Ltd
Easton-on-the-Hill
Stamford, PE9 3NP, UK
T: [phone]
E: [e-mail]
W: www.froment.co.uk