Brainboxes PX-246 Specifiche Scaricare il pdf (Pagina 10)

Specification

3.5 LOAD CURRENT SENSING

Measurement type True RMS conversion

Sample Rate 5KHz or better

Harmonics Up to 10

or better

Nominal CT secondary rating 5A

Maximum continuous current 5A

Overload Measurement 15A for 100ms

Absolute maximum overload 50A for 1 second

Burden

0.5VA (0.02Ω current shunts)

common mode offset ±2V peak plant ground to CT common terminal

Resolution 25ma

Accuracy ±1% of Nominal (5A) (excluding CT error)

3.5.1 VA RATING OF THE CTS

The VA burden of the module on the CTs is 0.5VA. However depending upon the type and length of

cabling between the CTs and the module, CTs with a greater VA rating than the module are required.

The distance between the CTs and the

measuring module should be

estimated and cross-referenced

against the chart opposite to find the

VA burden of the cable itself.

If the CTs are fitted within the

alternator top box, the star point

(common) of the CTs should be

connected to system ground (earth) as

close as possible to the CTs. This

minimises the length of cable used to

connect the CTs to the DSE module.

Example.

If 1.5mm² cable is used and the

distance from the CT to the measuring

module is 20m, then the burden of the

cable alone is approximately 15VA. As

the burden of the DSE controller is

0.5VA, then a CT with a rating of at

least 15+0.5V = 15.5VA must be used.

If 2.5mm² cables are used over the

same distance of 20m, then the

burden of the cable on the CT is

approximately 7VA. CT’s required in

this instance is at least 7.5VA (7+0.5).

NOTE:

NOTE:NOTE:

NOTE:

Details for 4mm² cables are shown for reference only. The connectors on the

Details for 4mm² cables are shown for reference only. The connectors on the Details for 4mm² cables are shown for reference only. The connectors on the

Details for 4mm² cables are shown for reference only. The connectors on the

DSE modules are only suitable for cables up to 2.5mm².

DSE modules are only suitable for cables up to 2.5mm².DSE modules are only suitable for cables up to 2.5mm².

DSE modules are only suitable for cables up to 2.5mm².

NOTE:

NOTE:NOTE:

NOTE:

CTs with 5A secondary windings are recommended with

CTs with 5A secondary windings are recommended with CTs with 5A secondary windings are recommended with

CTs with 5A secondary windings are recommended with DSE modules. 1A CTs

DSE modules. 1A CTs DSE modules. 1A CTs

DSE modules. 1A CTs

can be used if necessary however, the resolution of the readings is 5 times better when

can be used if necessary however, the resolution of the readings is 5 times better when can be used if necessary however, the resolution of the readings is 5 times better when

can be used if necessary however, the resolution of the readings is 5 times better when

using 5A CTs.

using 5A CTs.using 5A CTs.

using 5A CTs.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 81 82

Commenti su questo manuale

Nessun commento

Brainboxes PX-246 Specifiche Pagina 10

Commenti su questo manuale