Installation and
Operating Instructions
549 AC Ammeter
AC ammeter for measuring single phase
current.
Introduction
The 549 Digital Ammeter is designed to accurately measure AC
RMS Current via a Current transformer. Measurements will be
displayed on an integral LCD. The compact design allows it to be
fitted in a standard 17/32 inch switch knock out. The product
harvests power from the input signal. No other power supply is
required to power this product.
This manual provides all the necessary instructions to safely
install and operate the instrument.
Front Panel Buttons
In measurement mode, the buttons control the displayed
measurement as follows:
Screen navigation
In set-up mode, this is the ‘Next‘ button.
Changes the highlighted value
(set-up mode only)
Setting up
The instrument has a default CT ratio setting of 5:5A. Before
operation the product MUST be set to the correct CT ratio.
The instrument is fitted with an internal battery which has a
limited life expectancy as it is only designed for commissioning
purposes, when battery powered pressing two buttons
simultaneously enters “Setup” mode. The Instrument will
automatically switch off after approximately 10 seconds of
inactivity. The battery supplies the programming function and
does not affect the overall operation of the instrument. If the
battery does become exhausted the setup mode can still be
accessed by passing a current between 10-100% of nominal
through the product.
•
Press and hold the two buttons
and
simultaneously (for five
seconds if not battery powered) until
the CT Ratio screen is displayed.
•
Press the
button to enter CT ratio, edit mode. The
figure furthest left on the display will flash, use the
button to change value of this digit, to the desired value
then use the
button to move to the next digit.
Repeat this action for all the digits until the correct primary
current of the CT has been selected.
•
After making changes to the last digit press the
again, now all the primary current 4 digits will flash at
the same time.
•
Press the
button again to
confirm the value and the
display screen will show the
word ‘SET’. This indicates that
the value has been stored in
the product. Press the
button again to exit “edit mode”, the currently selected
primary CT value will be displayed.
•
To exit the Set-Up mode press both
and
buttons and the instrument will return to the measuring
screen.
Setup Menu Structure
•
Press and hold the two buttons
and
simultaneously (for approximately 10 seconds if not
battery powered) until the CT Ratio screen is displayed.
CT Ratio
•
Press the
again, to move to the
next screen in the menu.
Model Number
•
Press the
again, to move to the next screen in the
menu.
•
You cannot edit this screen
Serial Number (HEX)
•
Press the
again, to move to the
next screen in the menu.
•
You cannot edit this screen
Version Number
•
Press the
again, to move to the
next screen in the menu.
•
You cannot edit this screen
Segment Test
•
Press the
again, to move to the
next screen in the menu.
•
You cannot edit this screen
•
To exit the Set-Up mode, either press both
and
buttons (for approximately 10 seconds if not battery
powered) and instrument will return to the measuring
screen automatically.
•
If the product is being setup under
battery power then the LO screen may
appear briefly as the product returns to
measurement mode. Before the
battery power is disconnected.
549
549
