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DOC-MN-007-03 VCCM600 User Manual
Vox Power Limited | Unit 2, Red Cow Interchange Estate, Ballymount, Dublin 22, D22 Y8H2, Ireland | T +353 1 4591161 | www.vox-power.com
Series Connected Outputs
VCCM output modules of the same type can be series connected to achieve higher output voltages. Links for series connecting modules are available directly
from Vox Power or our local representatives.
The following instructions must be followed for output modules configured in this manner.
Isolation to Ground
Care must be taken not to exceed the output module isolation to chassis ground when series connecting modules. Each output module is rated for 500 Volts
maximum between each output terminal and chassis ground. Exceeding this voltage may damage the module.
Remote Sensing
For series connected modules, remote sensing is achieved by connecting the upper most positive sense terminal (S+) and the lower most negative sense
terminal (S-) from the series of modules to their respective load regulation points. All inner sense terminals in the series must be daisy chained i.e. S+ to S- from
the first module in the series to the last module in the series. An example of two series connected modules is shown below.
Series Connected Remote Voltage/Current Control
Remote voltage and/or current control is possible with series connected modules using the advanced V
CONTROL
and I
CONTROL
functions described earlier. However,
individual control of each module can be complex as the various control terminals are referenced to the positive output of the preceding module and require the
use of multiple isolated control voltages to attain control over the full voltage range. Please contact Vox Power or your distributor for assistance if remote voltage
or current control is required for series connected modules.
SELV Precautions
Where series combinations of output modules exceed 60V, the output can no longer be considered SELV (Safety Extra Low Voltage) and hence the final
equipment manufacturer must provide suitable protection for both users and service personnel.
External capacitance
When large external capacitances are connected to series connected outputs, the maximum input power can be exceeded at start-up and the unit can latch off.
Consider sequencing output start-up to prevent exceeding the input power limit when charging large external capacitances.
WARNING!
Energy and Voltage hazards may arise when individual modules are series connected. See the Safety section for more details.
When modules are connected in series, their inhibit lines (J3), if used, should be paralleled.
Inhibiting series connected modules individually may cause damage