KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 35)

KLP-HV 073008
2-9
2.7.4 POWER SUPPLY/LOAD INTERFACE
The general function of a voltage or current stabilized power supply is to deliver the rated output
quantities to the connected load. The load may have any conceivable characteristic: it may be
fixed or variable, it may have predominantly resistive, capacitive or inductive parameters; it may
be located very close to the power supply output terminals or it may be a considerable distance
away. The perfect interface between a power supply and its load would mean that the specified
performance at the output terminals would be transferred without impairment to any load,
regardless of electrical characteristics or proximity to each other.
The stabilized d-c power supply is definitely not an ideal voltage or current source, and practical
interfaces definitely fall short of the ideal. All voltage-stabilized power supplies have a finite
source impedance which increases with frequency, and all current-stabilized power supplies
have a finite shunt impedance which decreases with frequency. The method of interface
between the power supply output and the load must, therefore, take into account not only the
size with regard to minimum voltage drop, but the configuration with regard to minimizing the
impedance introduced by practical interconnection techniques (wire, bus bars, etc.). The series
inductance of the load wire must be as small as possible as compared to the source inductance
of the power supply: although the error sensing connection to the load compensates for the d-c
voltage drop in the power leads, it cannot completely compensate for the undesirable output
effects of the power lead inductance. These lead impedances (both power and sensing leads)
are especially important if the load is a) constantly modulated or step-programmed, b) has pri-
marily reactive characteristics, or c) where the dynamic output response of the power supply is
critical to load performance.
2.7.5 LOAD CONNECTION - GENERAL
Load connections to the KLP power supply are achieved via the (+) and (–) DC OUTPUT termi-
nals located on the rear panel; (+M) and (–M) outputs are also available at terminal blocks (TB5
and TB1, respectively) located on the panel for connection of external monitoring equipment
such as a DVM, oscilloscope, etc.
Configuration of local or remote sensing is facilitated by pre-installed jumpers which configure
the unit for local sensing.as shown in Figure 2-2.
NOTE: REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST BE
CONNECTED FOR PROPER OPERATION, EITHER LOCALLY, OR AT THE LOAD
(REMOTE). OBSERVE POLARITIES: THE +S TERMINAL MUST BE CONNECTED
TO EITHER +M (LOCAL) OR +LOAD (REMOTE), AND THE –S TERMINAL MUST BE
CONNECTED TO EITHER –M (LOCAL) OR –LOAD (REMOTE).
2.7.5.1 LOCAL SENSING/REMOTE SENSING SELECT
Local sensing (factory default configuration) is established by connecting terminal TB4 (+S) to
TB5 (+M) and TB1 (–M) to TB2 (–S) (see Figure 2-2). The power supply is shipped with two
jumpers installed to obtain local sensing.
Remote sensing is established by first removing the factory-installed local sensing jumpers
between +S and +M and between –M and –S. The +S and –S lines must be connected at the
load (see Figure 2-3). A high frequency bypass network consisting of two capacitors connected
across the load as shown in Figure 2-3 is recommended to reduce noise in the sense loop.