Lambda LP Series - Operating Procedures - Current and Series; Constant Current Operation; Series Connection - Constant Voltage

and 6, or at front panel test jacks (+)and(-) for voltage checks only; for remote sensing
connections check at the load terminations of sensing leads on terminals 3 and 7.
*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 rna. point as zero
point.
Constant Current Operation With Crossover, Adjustable Voltage Limit
1. Remove AC power input to the supply and place power ON-OFF switch in OFF
position before connecting load to the supply.
2. Determme load requirements, select wire size and length from figures 1 and 2
and connect load to the supply as shown in figure 3. ·
3. Turn the CURRENT LIMITER controls to the desired current setting.
4. When load voltage must be limited to an intermediate value within the voltage
rating of the supply, turn OUTPUT VOLT AGE control knobs to the desired voltage limit
setting. If no intermediate voltage limit, within rating of supply is desired, turn controls
to the full CW position to obtain voltage limit at maximum voltage rating of the supply.
5. Apply AC power to the supply.
6. Place power ON-OFF switch in ON position and check that red power ON indicator
is lit.
7. Check that output current* and output voltage meters indicate desired values;
adjust OUTPUT VOLTAGE control knobs and CURRENT LIMITER controls as required to
obta)n correct indications. For non.,-metered models use externally connected meters and
check that correct meter indications exist at output terminals 4 and 6, or at front panel
test jacks ( +) and (-) for voltage checks only.
*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 rna. point as zero
point.
8. Power supply is now in proper operation.
S~ries Connection Constant Voltage Operation, With Current Limit
1. Remove AC power input to both units and place power ON-OFF switches in OFF
position before connecting load to the supplies.
2. Determine load requirements, select wire size from figures 1 and 2 and connect ·
in accordance with figure 7. Refer to paragraph on Connections for Series Operation.
3. Select diodes CR1 and CR2 in accordance with instructions contained in Con-
nections for Series Operation.
4. Turn OUTPUT VOLTAGE control knobs of both units to obtain the desired output
voltage. These settings must be the output voltage for the combination.
5. When current to the load must be limited to an intermediate value within current
rating of the un1ts, turn the CURRENT LIMITER controls of each unit to a setting equal to
12
IM-LP400
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