HP 6038A - Page 41

3-211 Foldback protection, if desired, may only bo used with
the master power supply.
3-212 Figure 3-14 shows the rear-pane! MODE switch set¬
tings and terminal connections for auto-parallel operation. This
configuration provides 0 to 60 Vdc at an output current of up
to 20 Adc.
3-213 Setting Voltage and Current. Program the slave
unit's output voltage above the master's to avoid interference
with master-unit CV control. The slave unit's MODE switches
disable the slave unit's current setting from having any effect
In auto-parallel operation. Program the master unit to the desired
output voltage and current. Verity that the slave is in CC
operation.
3-214 When in CV operation, the master unit's voltage set¬
ting is the output voltage of the auto-parallel combination. The
output current is the total current from all units. The fraction
of total current that each unit provides is the same as the ratio
of that unit's output current capability to the total output cur¬
rent capability of the auto-parallel combination.
3-215 In CC operation, the user must add up the current
outputs from each unit and adjust the master until the total
equals the desired load current.
LOAD
Figure 3-14. Auto-Parailel Operation
3-216 Overvoltage Protection. Adjust the desired OVP shut¬
down limit using the master unit's OVP ADJUST control. Set
the slave unit's OVP limit above the master's. When the master
unit shuts down, the master programs the slave unit to zero
voltage output. If a slave unit shuts down (because its OVP
shutdown limit is set lower than the master's), it shuts down
only itself, and the other unit supplies all the load current. The
shut-down slave unit will draw some current through its down
programming circuit. The extra current required from the master
unit may cause the master to switch from CV to CC mode.
3-217 Remote Sensing. To remove sense with auto¬
parallel operation, connect remote-sense leads only to the
master unit according to the remote-sensing Instructions In
paragraph 3-40.
3-218 Remote Programming. To remove program with
auto-parallel operation, set up only the master unit for remote
programming.
NOTE
Down-programming speed is slower with auto¬
parallel operation because only the master unit's
down programmer operates.
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Figure 3-15. Series Operation
3-28