Brultech Greeneye Monitor Manual de usuario descargar pdf (Pagina 15)

Channel CT Menu

 Page 14

CHANNEL CT MENU

Figure 9

OVERVIEW

This page is used to configure the settings for the current transformers (CT). For each of the 32 channels,

the following CT parameters are configured:

 CT Type

 CT Range

 CT Model

 Multiplier

Depending on the model of the CT used for a given channel, a “Type” and “Range” needs to be specified.

These two values are used to scale the CT output to reflect the proper current. For example a 33mV

signal from a SPLIT-200 CT indicates 20A of current flow while the same 33mV from a SPLIT-60

represents 6A.

CT Type

This value is a multiplier constant based on the current transformer parameters such as turns ratio and

burden resistor. This

CT Range

The “Range” value doubles the displayed power every time its value is reduced by 1. For example if a

channel is displaying 200 watts and the CT range is set to “4”, reducing the CT range to “3” will cause the

power to display 400 watts. Reducing the range to “2” will change the reading to 800 watts, and so on.

CT Model

Brultech provides a variety of current transformer options. Each CT has a part number which is

considered the “Model”. By using a “Model” to specify the CT, the GEM will automatically insert the

appropriate “CT Type” and “CT Range” for this model, simplifying the CT setting process.

Multiplier

The multiplier has no effect when set to “0”. If it is set to “1”, the CT signal is doubled. This is used for

120V/240V split phase installation (common North American residential service) where a 240V balanced

load is monitored with only one CT. Since many 240V loads require two CTs (one for each line), the

power is calculated based on 120V for each line. If a 240V load is balanced*, the single CT signal needs

to be doubled to simulate two summed CT signal.

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Brultech Greeneye Monitor Manual de usuario Pagina 15