KEPCO KLN Series (750W, 1500W, 3000W), Main Contro Firmware Version 1.70 and higher - Manual (Page 11)

KLN Series 051614 1-1
SECTION 1 - INTRODUCTION
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the KLN series of 750,
1500W, and 3000W Watt programmable, voltage and current stabilized d-c power supplies,
hereafter referred to as KLN, from Kepco, Inc., Flushing, New York, U.S.A.
1.2 GENERAL DESCRIPTION
KLN Series power supplies are voltage and current stabilized d-c sources with a sharp cross-
over between the constant voltage and constant current mode of operation. Thirty-nine models
are offered, 13 in each power grouping, with rated d-c output voltage ranging from 6V to 600V
and rated d-c output current ranging from 1.25A to 400A (see Table 1-1).
KLN switching power supplies operate from wide range 100-240V a-c (190-240V a-c for
3000W), 50/60 Hz input source power and employ active power factor correction (PFC). Since
there are no internal adjustments, KLN Power Supplies offer excellent output voltage/current
stability and easy calibration.
Output voltage and current are displayed on independent LED displays. Control of the KLN can
be either local, via the front panel controls and displays, or remote, using 1) either analog sig-
nals (applied to the Programming Control Port), or 2) digital programming. Digital programming
of standard models is via RS-485 communication bus. Optional IEEE 488.2 (GPIB) and LAN
interfaces are also available.
KLN output and readback are high resolution: 16 bits D/A to set output voltage and current, 24
bits A/D for readback of output voltage and current. These units feature a low temperature coef-
ficient: Constant Voltage mode: 100ppm/°C, Constant Current mode: 100ppm/°C, and built-in
remote sensing with a maximum compensation of 5V voltage drop across power lines.
The KLN series is suitable for ATE automatic test, burn- in test and other applications that
require lots of testing power.
The KLN power supply acts as a constant voltage source for comparatively large values of load
resistance, and as a constant current source for comparatively small values of load resistance.
The transition between these two modes of operation occurs automatically at a “critical” or
“crossover” value of load resistance
Rc = Es/Is, where Es is the voltage control setting and Is
is the current control setting (see Figure 1-1).
FIGURE 1-1. KLN POWER SUPPLY, AUTOMATIC CROSSOVER CHARACTERISTICS