TREND EM3-CT-N User Manual

Installation Instructions

Three Phase Electricity Meters

EM3/CT/N Three Phase Electricity Meters
The EM3/CT/N has the following specification with regard to the available options:

Model :PowerRail 303
Voltage :400/230 V 3 Phase, 3 or 4 wire
Current :5A from external CTs
Isolated Pulse Output :Fitted

Document Attached:
Northern Design (Electronics) Ltd. PowerRail 303 Operating Guide (August 2007)

Additional Information:

EM3/CT/N Three Phase Electricity Meter Data Sheet, TA200701

Disposal:

WEEE Directive :

EM3/CT/N

At the end of their useful life the packaging,
and product should be disposed of by a suitable

Do not dispose of with normal household waste.
Do not burn.

recycling centre.

1EM3/CT/N Installation Instructions TG200702 Issue 1/C 07/01/2008

EM3/CT/N Installation Instructions

Please send any comments on this or any other Trend technical publication to [e-mail]

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du
Bois 37,Switzerland by its Authorized Representative, Trend Control Systems Limited.

©Trend Control Systems Limited 2007. Trend Control Systems Limited reserves the right to revise this publication from time to time and make

changes to the content hereof without obligation to notify any person of such revisions or changes.

Trend Control Systems Limited

P.O. Box 34, Horsham, West Sussex, RH12 2YF, UK. Tel:[phone] Fax:[phone] www.trend-controls.com

Trend Control Systems USA

6670 185th Avenue NE, Redmond, Washington 98052, USA. Tel: [phone], Fax: [phone] www.trend-controls.com

2 EM3/CT/N Installation Instructions TG200702 Issue 1/C 07/01/2008

PowerRail 303

Operating Guide August 2007

Copyright Northern Design Bradford UK 2007

Safety

1 Safety

This instruction manual gives details of safe installation and operation of the PowerRail 303
electricity meter. Safety may be impaired if the instructions are not followed. Labels on each
meter give details of equipment ratings for safe operation. Take time to examine all labels before
commencing installation. Safety symbols on the meter have specific meanings.

Refer To User Manual Risk of Electric Shock

WARNING

The meter contains no user serviceable parts. Installation and

commissioning should only be carried out by qualified personnel

Further information is available at http://www.ndmeter.co.uk.

PowerRail303 Page 2

Operation

2 Operation

2.1 Energy Displays

2.2 Total kWh Register

This default display presented on power up shows total kWh on an 8-digit accumulating register.
Register scaling is determined by user programmed CT and/or PT constants. On standard

PowerRail meters this register may not be reset.

2.3 KWh Count Register

The kWh Count display is a 7-digit resetable accumulating energy register. This acts in a similar
manner to the “Trip” display on a vehicle odometer.

• Press the key to select Total kWh or kWh Count display pages. The kWh Count
display remains visible for 1 minute before the unit reverts to Total kWh mode.

• Press and hold the and keys for approximately 5 seconds to reset the kWh Count
register to zero.

kWh

1234567.8

Total kWh Register

kWh

1234567.8

kWh Count Register

Scaling of the energy registers is set by the nominal input currents and voltages and remains
constant during normal operation of the meter.

Energy registers will accumulate from zero to 99999999, and then restart from zero.
If no keys are pressed, the meter will automatically revert to the Total kWh Register display after

60 seconds.
Both energy registers are stored in non-volatile memory during power loss to the meter.

Count

PowerRail303 Page 3