KEPCO KT Series Accessories - Manual

©2007, KEPCO, INC 1
Data subject to change without notice 228-0949 REV 6
I N S T R U C T I O N M A N U A L
KT KEPCO
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
http://www.kepcopower.com " email: [email protected]
An ISO 9001 Company.
ACCESSORY
EQUIPMENT
CURRENT CONTROL RHEOSTAT
CURRENT SENSING RESISTORS
GENERAL DESCRIPTION (Refer to FIG’s 1 and 2)
Kepco Current Sensing and Control Resistors are precision, wire-wound components with low temperature coeffi-
cients. The 4-terminal current sensing resistor (R
S
) and the 10-turn current control rheostat (R
CC
) provide all the exter-
nal circuitry needed to convert a d-c voltage stabilizer into a d-c source supplying stabilized output current. The sensing
resistor (R
S
), placed in series with the load, provides a voltage drop proportional to the output current. The control
rheostat (R
CC
) is connected to supply feedback from the sensing resistor to the NULL JUNCTION (INVERTING
INPUT) of the power supply. In this manner, excellent current stabilization can be achieved over a minimum range of
2% to 100% of I
O
max. where I
O
max. is the selected maximum power supply output current. (Refer to FIG. 2). The cur-
rent sensing resistors can also be used for measuring the output current delivered by the power supply.
FIGURE 1. KEPCO CURRENT SENSING RESISTORS AND CONTROL RHEOSTAT
TABLE 1. KEPCO SENSING RESISTORS
MODEL
RESISTANCE
(OHMS)
TERMINATION
POWER
RATING (1)
RECOMMENDED OUTPUT CURRENT RANGE
BASED ON 1-VOLT SAMPLE
OUTLINE
DIMENSIONS
LOW HIGH
KT 1915 1.0 LEADS 50W 0.02A 1A SEE FIG. 4, A
KT 1385 0.667 LEADS 50W 0.03A 1.5A SEE FIG. 4, A
KT 1399 0.5 LEADS 50W 0.04A 2A SEE FIG. 4, A
KT 1386 0.333 LEADS 50W 0.06A 3A SEE FIG. 4, A
KT 1598 0.2 LEADS 50W 0.01A 5A SEE FIG. 4, A
KT 2356 0.1 LEADS 50W 0.2A 10A SEE FIG. 4, A
KT 2713 0.01 LEADS 50W N.A.
(2)
N.A.
(2)
SEE FIG. 4, A
KT 2537 0.0625 LEADS 100W 0.32A 16A SEE FIG. 4, B
KT 2536 0.05 LEADS 100W 0.4A 20A SEE FIG. 4, B
KT 2480 0.033 LEADS 100W 0.6A 30A SEE FIG. 4, B
KT 2330 0.02 LEADS 100W 1A 50A SEE FIG. 4, B
KT 2325 0.01 LEADS 100W 2A 100A SEE FIG. 4, B
KT 2714 0.001 LEADS 100W N.A.
(2)
N.A.
(2)
SEE FIG. 4, B
KT 3146 1 SCREW 30W 0.02A 1A SEE FIG. 4, D
KT 3126 0.1 SCREW 30W 0.2A 10A SEE FIG. 4, D
KT 3130 0.01 SCREW 30W 1A 50A SEE FIG. 4, D
KT 3131 0.001 SCREW 30W 2A 100A SEE FIG. 4, D
(1)
A suitable heatsink must be provided, See “INSTALLATION” paragraph.
Power Rating based on 275 °C max. hot spot temperature in 25 °C ambient, derate to 80% power in 71 °C ambient.
(2)
These sensing resistors are designed to provide a 0-200mV sample voltage for currents of 20A (KT 2713) and 200A (KT 2714) respectively.
Kepco Model KT 1304, 0-1000 Ω
1W at 65°C, 20 ppm max
See FIG. 4, C for dimensions.
CURRENT FEEDBACK CONTROL TYPICAL 100W RESISTOR (LEADS) TYPICAL 50W RESISTOR (LEADS) TYPICAL 30W RESISTOR (SCREWS)