Lambda LP Series - Operating Procedures - Parallel Connection; Parallel Connection - Constant Voltage

8. Check that output current* and output voltage meters indicate desired values;
total voltage is the sum of (1) and (2) unit voltages. As required, adjust OUTPUT VOLTAGE · ,....-..._ ..
control knobs and CURRENT LTI\1ITER controls of units to obtain correct indications. For
non-metered models, use externally connected meters and check that correctmeter in-
dications exist at output terminals of the (1) and (2) units; positive (+) terminal 6 of (1) uriit
and minus (-) terminal4 of the ( 2) unit are the output terminals of the series combination.
*Ammeter indicates a nominal 5 milliamperes offset from zero, which is the sensing
divider current and not load current. For load current use the 5 ma. point as zero
point.
Use front panel jacks(+) of (1) unit and(-) of(2) unit to make output voltage check on
non-metered units.
9o Power supplies are now in proper operation.
Parallel Connection Constant Voltage Operation, With Current Limit
1. Remove AC power input to each supply and place power ON-OFF switch on both
(M) and (S) units in OFF position before connecting load to the supplies.
2. Determine load requirements, select wl.re size from figures 1 and 2 in the
manual. Refer to paragraph on Connections for Parallel Operation.
3. Connect supplies to load as shown in connection diagram, figure 8 for local
sensing, or figure 9 for remote sensing. Choose correct value for REXT from VALUE CHART~ ~
NOTE: When shipped from the factory , each supply is ready for use as a
local-sensing constant voltage source with automatic crossover or as a
constant current source. Jumpers are connected at the factory as shown
in figure 3. Take care to remove the appropriate jumpers for load re-
quirements that need different supply-load connections. Refer to the
connection diagram.
4. Turn OUTPUT VOLTAGE control knobs on the (M) unit to the desired voltage
setting, ~nd turn the output voltage controls on the (S) unit to fully CCW position~
5. When current to the load must be limited to an intermediate point, turn the
CURRENT LIMITER controls on both the (M) and (S) units to the desired current limit
setting. Set current limit control on the (M) and (S) units to the position indicating the
current value to be delivered by the respective unit. If no intermediate . current limit is
desired, turn the controls CW on both (M) and (S) units to the position for full rated current
for the maximum ambient temperature of operation. Refer to section on Specifications
and Features.
6. Apply AC power to each supply.
7. Place power ON-OFF switches . on (M) and (S) units in ON position and check that
red power ON indicators are lit.
8. Check that output current* and output voltage meters on both (M) and (S) units
indicate desired values; as required, adjust OUTPUT VOLTAGE controls and CURRENT
LIMITER controls on (M) unit to obtain correct meter indications. For non-metered
models use externally connected meters and check that correct meter indications exist at
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IM-LP400
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