Lambda LP Series - Ground Connections and Modes; Grounding Options; Basic Modes of Operation; Supply Load Connections

GROUND CONNECTIONS
The Lambda power supply can be operated either with negative or positive output
terminal grounded or with no terminal grounded. Both positive and negative ground con-
nections are shown in the diagrams for all suggested output connections illustrated in this
manual. ·
NOTE: When operating the supply with neither term-
inal grounded, high impedance leakage resistance
and capacitance paths can exist between the power
supply circuitry and chassis ground.
BASIC MODES OF OPERATION
This power supply is designed to operate as a constant voltage source or as a constant
currentsource. Automatic crossover to either mode of operation occurs when load con-
ditions change as follows:
Constant Voltage. The power supply will function as a constant voltage source while the
load current does not equal the current value, ILnvr. set by the CURRENT LIMITER control
When load current IL = ~L= ILIM, the supply will cross over \ automatically and will operate
as a constant current source. Further decrease in value of lqad resistance RL results in
decrease of voltage across the load while current remains regulated to ILIM·
Constant Current (Automatic Crossover). The power supply will function as a constant
current source while the load voltage VL does not equal the voltage value set by the OUTPUT
VOLTAGE control. When load voltage VL equals the value set by \ the OUTPUT VOLTAGE
control, the supply will automatically cross over and operate as a\ ponstant voltage source.
\
~\
SUPPLY LOAD CONNECTIONS
NOTE:
Refer to DETAILED OPERATING PROCEDURES for step-by-step
instructions for operation of power supply.
Connections For Operation as a Constant Voltage Source .
The output impedance and regulation of the power supply at the load may change ·
when using the supply as a constant voltage source and connecting leads of practical
length are used. To minimize the effect of the output leads on these characteristics,
remote sensing is used. Recommended types of supply-load connections with local or
. remote sensing are described in the following paragraphs.
Refer to figure 1 to determine voltage drop for particular cable length, wire size and
current conditions. Lead lengths must be measured from supply terminals to load terminals
as shown in figure 2.
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IM-LP400
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