Campbell CS15-L User manual

CS15-L Current Transformer
Revision: 10/08
Copyright © 2001-2008
Campbell Scientific, Inc.

Warranty and Assistance
The CS15-L CURRENT TRANSFORMER is warranted by CAMPBELL
SCIENTIFIC, INC. to be free from defects in materials and workmanship
under normal use and service for twelve (12) months from date of shipment
unless specified otherwise. Batteries have no warranty. CAMPBELL
SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or
replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
The customer shall assume all costs of removing, reinstalling, and shipping
defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL
SCIENTIFIC, INC. will return such products by surface carrier prepaid. This
warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products
which have been subjected to modification, misuse, neglect, accidents of
nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,
indirect, incidental, or consequential damages.
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served by Campbell Scientific, Inc. directly. Affiliate companies handle
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CS15-L Table of Contents
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1. General Description.....................................................1
2. Specifications ..............................................................1
3. Installation....................................................................2
4. Wiring............................................................................ 2
5. Measurement Instruction ............................................2
5.1 Sample Program........................................................................................2
Figure
1. CS15-L Current Transformer .....................................................................1
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CS15-L Current Transformer
1. General Description
The CS15-L uses a modified CR Magnetic’s CR8459 Current Transformer to
measure the approximate current over a range of 0 to 125 A. The CS15-L
outputs a millivolt signal allowing it to be directly connected to the CR2XX
dataloggers. The CS15-L is recommended for measurements that do not
require high accuracy.
FIGURE 1. CS15-L Current Transformer
2. Specifications
Example Applications:
•Motor or generator load conditions
•Efficiency studies
•Intermittent fault detection
•Rough submetering
Manufacturer’s Specifications
Frequency: 50 and 60 Hz
Insulation Resistance: 100 M ohm @ 500 VDC
High Potential: 2000 volts
Rated Current: 125 A
Storage Temperature: -25ºC to 70ºC
Operating Temperature: -25ºC to 55ºC
Case Material: Polypropylene Resin
Construction: Epoxy Encapsulated
Accuracy with 10 ohm
burden max. (resistive): typically ±5 percent of actual value with
provided multiplier
Dimensions: Outer diameter: 1.89” (4.8 cm)
Inner diameter: 0.75” (1.9 cm)
Depth: 0.67” (1.7 cm)
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CS15-L Current Transformer
3. Installation
Mount the AC load wire through the hole of the CS15-L.
4. Wiring
The CS15-L uses a single-ended analog channel.
Red ---------------- Ex
White -------------- Single-Ended Channel
Black -------------- AG
Clear--------------- AG
5. Measurement Instruction
In the CR2XX datalogger the VoltSE instruction is used.
SCWIN users: This manual was written primarily for those
whose needs are not met by SCWin. Your procedure is much
simpler: just add the CS15-L (it’s in the Miscellaneous Sensors
folder), save your program, and follow the wiring shown in Step
2 of SCWin.
NOTE
The example measurement instructions that follow do not store
data to final storage. Additional instructions (DataTable and
CallTable for the CR2XX) are required to store data
permanently.
NOTE
5.1 Sample Program
This sample program measures a single CS15-L Current Transformer directly
connected to the SE 1 channel of the CR2xx.
The multiplier in this program example is 0.2 and is representative of one
application. The multiplier can be changed to match calibrated measurements.
You should use a multiplier that you have validated for your purposes.
EXAMPLE 1
‘CR200 Series
‘Program Name CS15-L.CR2
‘
‘Wiring:
‘SE1 White
‘Gnd Black
‘EX1 Red
‘Gnd Clear
‘
‘Declare Public Variables
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CS15-L Current Transformer
Public Crnt_A
Public N
Dim Offset
Dim SumSqr
Dim mV
Dim I
Units Crnt_A = Amps
‘Main Program
BeginProg
N = 48
Scan (1,Sec)
‘CS15 Current Transformer measurement CS15_L:
Excitev (Ex1,mV2500)
Offset=0
SumSqr=Offset
For I=1 to N
VoltSe (mV,1,1,1.0,0)
SumSqr=SumSqr+mV^2
Offset=Offset+mV
Next
ExciteV (Ex1,0)
Crnt_A=SQR ((SumSqr – (Offset^2/N))/N) *0.2
If Crnt_A<0.2 then Crnt_A=0
‘Call Output Tables to store data
NextScan
EndProg
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CS15-L Current Transformer
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Campbell Scientific Companies
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