Configuring Multiple Supplies For Series Operation - Ametek Sorensen XG Operation Manual

Configuring Multiple Supplies for Series Operation

A maximum of two power supplies of the same rating can be connected
in series to increase the output voltage.
CAUTION: Equipment damage
When two power supplies are connected in series, they should be programmed
to the same output voltage to prevent damage to the lower voltage supply at
short circuit condition.
Load Considerations
CAUTION: Equipment damage
Use properly rated diodes to protect the power supply from damage while
driving inductive loads..
INDUCTIVE LOADS:
To prevent damage to the power supply from inductive kickback,
connect a diode (rated at greater than the supply's output voltage and
current) across the output. Connect the cathode to the positive output
and the anode to return. Where positive load transients, such as back
EMF from a motor may occur, a second diode in series with the output is
recommended to protect the power supply.
BLOCKING and FREE WHEELING DIODES:
The Peak Reverse Voltage ratings should be a minimum of 2-3 times the
power supply maximum output voltage. The Continuous Forward
Current rating should be a minimum of 1.5 times the power supply
maximum output current. Heatsink may be required. There also may be
a need for higher voltage rated parts, dependent on load circuit design
and inductor values.
Connecting to the Load in Local Sensing Mode
Connect the negative (-) output terminal of one power supply to the
positive (+) output terminal of the next power supply. See Figure 3-5 for
a representation of series operation.
M370430-01 Rev B
Local Operation
3
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