Elster gREX User manual

August 2009 IL42-4210C
Elster
Raleigh, North Carolina USA
[phone] (Technical Support in the US)
[phone] (Canada Main)
[email protected]
www.elsterelectricity.com
gREX™ Meter Installation Instructions
General
This leaflet contains general installation instructions for 2-wire and 3-wire applications of the gREX meter. All meters are
factory-calibrated and tested before shipment. For proper installation, accuracy, and maximum life of the meter, use the
following installation instructions. For more information about the operation of the meter, see the gREX Meter Technical
Manual (TM42-2420) and the gREX Meter Technical Manual for use in Canada (TM42-2425).
DANGER
!
Dangerous voltage with high current capabilities are present. Use authorised utility procedures to install and
service metering equipment. Equipment damage, personal injury, or death can result if safety precautions are not
followed.
Preliminary inspection
All meters are calibrated and tested before shipment. For proper installation, accuracy, and maximum life of the meters, use
the following installation procedures.
WARNING
!
Use authorised utility procedures to install and service metering equipment. Dangerous voltages are present. Equipment
damage, personal injury, or death can result if safety precautions are not followed.
Before installing and applying power to the gREX meter, Elster recommends a brief inspection of the meter. Check for any of
the following items:
■missing or broken parts
■missing or broken wires
■bent or cracked components
■evidence of overheating
Also, check the nameplate to make certain the meter is appropriate for the service.
Physical damage to the outside of the gREX meter may indicate a risk of electronic damage to the inside of the meter. Do not
connect power to a meter that is suspected of having internal damage. Contact your Elster representative if you suspect your
meter may be damaged.
Placing the meter into service
See “Wiring diagrams” on page 3 for illustrations of connection wiring diagrams.
CAUTION
!
Make certain to install the correct meter for the service type, maximum current, and capacity required. Installing mismatched
meters can damage equipment. Always verify that the maximum meter voltage and current ratings are equal to or greater than
the maximum service voltage and current.
If a gREX meter is installed in a meter shop and a collector is powered at the same time, the gREX meter may have registered
to the collector. Before removing the gREX meter from the shop, the meter should be unregistered from the collector (see the
technical manual for specific instructions).

IL42-4210C August 2009
2
To install the gREX meter safely and effectively, follow this procedure:
1. Decide whether to use the upper or lower meter hanger location. Using the lower meter hanger location will hide the top
supporting screw.
2. Using an M5 screw for the top supporting position, hang the meter on it. Make certain that the meter is level. The meter
will operate correctly in any position, but failing to mount the meter in a proper vertical position will place the other
mounting holes at the wrong place on the mounting panel.
3. Decide whether to use the side supporting screw location or the bottom supporting screw location. Select the screw
location that is better suited for the mounting plate.
4. Use an M5 screw to secure the meter enclosure at either the side screw location or bottom screw location.
NOTICE
Elster does not recommend the use of the gREX meter in aluminum wiring applications.
5. Ensure the voltage is either disconnected from a power source or that utility safety practices for handling live circuits are
strictly followed.
6. Wire the meter using colour-coded wire according to locally applicable specifications.
7. After wiring the meter and making any relay connections, assemble the terminal cover and apply power.
Figure 1. gREX meter mounting screw locations
Initial setup
After installing and powering the gREX meter, verify the following:
■If there is a load, the pulse indicator on the LCD is flashing; and the real energy arrows indicate the correct energy
flow direction.
■Required meter seals are in place.
■Any information (such as location of the meter) has been recorded.
If the meter is not working properly after it has been installed, then check for improper installation or wiring. If the installation
and wiring are correct, then check these other areas:
■the meter installation matches the meter nameplate
■the correct type of gREX meter is installed in the existing service
■no evidence of mechanical or electrical damage to either the meter or the installation location
■the service voltage falls within the operating range as indicated on the nameplate
■the seals are not broken
Notes: A broken seal may be an indication of tampering with the gREX meter installation.
Upper meter
hanger location
Lower meter hanger
location hidden in figure
Side supporting
screw locations Bottom supporting screw
locations

August 2009 IL42-4210C
3
Removing the meter from service
Use caution when removing the gREX meter from service.
WARNING
!
Use authorised utility procedures to remove metering equipment. Dangerous voltages are present. Equipment damage,
personal injury, or death can result if safety precautions are not followed.
When the meter is removed from the field, the meter registration status should be cleared before installing the meter in a new
location (see the technical manual for more information).
If it becomes necessary to remove a gREX meter from service, use the following procedure:
1. Before disconnecting the meter, make certain that the existing meter data has been read and recorded from the display.
2. Remove the terminal cover screw and remove the terminal cover.
3. Disconnect the wiring.
4. Remove the side or bottom supporting screws, as applicable.
5. Lift the meter off the meter hanger screw.
Wiring diagrams
The gREX meter is available for direct connected service. Refer to the wiring diagram on the nameplate for each meter for
specific terminal assignments. All connections are equipped with combination-head screws that accept either a slotted or
Phillips screwdriver.
Figure 2. Single phase, 2-wire Figure 3. Single phase, 2-wire with disconnect
Figure 4. Single phase, 3-wire
L1
N
L
I
N
E
L
O
A
D
L1
N
L
I
N
E
L
O
A
D
L1
L2
L
I
N
E
L
O
A
D
N

IL42-4210C August 2009
DISCLAIMER OF WARRANTIES AND LIMITATIONS OF LIABILITY
There are no understandings, agreements, representations, or warranties either express or implied, including warranties of merchantability
or fitness for a particular purpose, other than those specifically set out by any existing contract between the parties. Any such contract
states the entire obligation of the seller. The contents of this document shall not become part of or modify any prior existing agreement,
commitment, or relationship.
The information, recommendations, descriptions, and safety notices in this document are based on Elster experience and judgment with
respect to operation and maintenance of the described product. This information should not be considered as all-inclusive or covering all
contingencies. If further information is required, Elster should be consulted.
No warranties, either expressed or implied, including warranties of fitness for a particular purpose or merchantability, or warranties arising
from the course of dealing or usage of trade, are made regarding the information, recommendations, descriptions, warnings, and cautions
contained herein.
In no event will Elster be responsible to the user in contract, in tort (including negligence), strict liability or otherwise for any special, indi-
rect, incidental, or consequential damage or loss whatsoever, including but not limited to: damage or loss of use of equipment, cost of
capital, loss of profits or revenues, or claims against the user by its customers resulting from the use of the information, recommendations,
descriptions, and safety notices contained herein.
Elster
Raleigh, North Carolina
United States 
*IL42-4210C*
© 2009 by Elster.
All rights reserved.
Printed in the United States.
Figure 5. gREX meter dimensions
132
[5.2]
229
[9.0]
217.5
[8.6]
222.5
[8.8]
71.5
[2.8]
Approximate dimensions in millimeters [inches].
For reference purposes only.
132
[5.2]
194.5
[7.7]
176.0
[6.9]
3
[0.1]
71.5
[2.8]
Approximate dimensions in millimeters [inches].
For reference purposes only.
Approximate dimensions in millimeters [inches].
For reference purposes only.
154
[6.0]
181.5
[7.4]
18.5
[0.7]
44
[1.7]
105
[4.1]
132
[5.2]
Ø 9.5
[0.37]