Brultech Micro-CTs
- Thread starter Automate
- Start date
fcwilt
Active Member
Anything wrong with getting them here (other then no 50s) ?
http://www.brultech.com/home/store/category.php?id_category=38
http://www.brultech.com/home/store/category.php?id_category=38
sda
Active Member
Here's an excerpt from a document I had about the CTs. Its for the 1220, but it may apply to the 1240.
What is “CT Setting”?
Since the ECM-1220 is capable of monitoring circuits in a wide range of applications, the SPLIT-60 CT
described above would not be capable of monitoring a 200A panel or load. This application would require
a 200 Amp CT, which would produce 333mV at 200A.
The ECM-1220 needs to know what type of CT is sensing the current, since a signal of 333mV could
represent 60A or 200A for the two CT types mentioned above.
The “CT Setting” consists of two values:
1. CT Type:
This is a constant used by the ECM-1220 to calculate the current based on
the CT’s output.
2. CT Range:
This is a “divide by two” divider value. Every increase in this count
assumes a CTs of half the value for example:
SPLIT-200: Type: 167 Range: 4
SPLIT-100: Type: 167 Range: 5
The CT “Type” and “Range” is generally labelled on the CT itself.
What should the CT “Type” and “Range” to?
The most common settings are:
60 Amp CT (SPLIT-60) Type: 100 Range: 5
100 Amp CT (SPLIT-100 or CLAMP-100) Type: 167 Range: 5
200 Amp CT (SPLIT-200 or CLAMP-200) Type: 167 Range: 4
How to calculate the CT setting:
The CT setting may be calculated using the following formula:
Type = CT current / 60 x 100 and Range = 5
Where CT current represents the current which produces 333mV
If “Type” is greater than 255 then:
Type = Type/2
and
Range = Range -1
If “Type” is less than 128 then:
Type = Type X 2
and
Range = Range +1
What is “CT Setting”?
Since the ECM-1220 is capable of monitoring circuits in a wide range of applications, the SPLIT-60 CT
described above would not be capable of monitoring a 200A panel or load. This application would require
a 200 Amp CT, which would produce 333mV at 200A.
The ECM-1220 needs to know what type of CT is sensing the current, since a signal of 333mV could
represent 60A or 200A for the two CT types mentioned above.
The “CT Setting” consists of two values:
1. CT Type:
This is a constant used by the ECM-1220 to calculate the current based on
the CT’s output.
2. CT Range:
This is a “divide by two” divider value. Every increase in this count
assumes a CTs of half the value for example:
SPLIT-200: Type: 167 Range: 4
SPLIT-100: Type: 167 Range: 5
The CT “Type” and “Range” is generally labelled on the CT itself.
What should the CT “Type” and “Range” to?
The most common settings are:
60 Amp CT (SPLIT-60) Type: 100 Range: 5
100 Amp CT (SPLIT-100 or CLAMP-100) Type: 167 Range: 5
200 Amp CT (SPLIT-200 or CLAMP-200) Type: 167 Range: 4
How to calculate the CT setting:
The CT setting may be calculated using the following formula:
Type = CT current / 60 x 100 and Range = 5
Where CT current represents the current which produces 333mV
If “Type” is greater than 255 then:
Type = Type/2
and
Range = Range -1
If “Type” is less than 128 then:
Type = Type X 2
and
Range = Range +1
