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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
Parallel Remote Sensing
Remote sensing can be used as normal with paralleled modules. The sense lines (S+ and S-) from each of the output modules should be connected together, S+
to S+, and S- to S- as shown below. This should be done close to the power supply output and a single pair of cables brought from these sense lines to the load.
Keeping cable lengths to a minimum and using twisted pairs where necessary will help reduce noise pickup in the sense lines.
N+1 Configurations
When using N+1 redundant configurations, a suitably rated diode (or controlled MOSFET) must be used on each output to prevent a device failure from causing
a system failure. However, the diode introduces voltage drops between the supply and the load that significantly degrade the load regulation. To counteract this,
the remote sense lines can be used to regulate the voltage at the load as shown below.
Typically, this configuration can damage the internal sense resistors used within a power supply. However, the VCCM outputs have integrated protection to
prevent this type of damage and are completely N+1 compatible without any additional external protection circuitry. Note that only the positive sense terminal is
protected and diodes should be used in the positive connection only.
WARNING!
Care must be taken to avoid differential voltages between the negative power output terminals of share mode paralleled modules as this can cause errors
at the control pins. To avoid this, it is recommended to use Vox Power parallel links to parallel modules in share mode.
