Sorensen SFA Series, Operation Manual

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Sorensen SFA Series Operation
Figure 3–13. Master/Slave Connection
NOTE: The OCP circuit remains active for all units in parallel operation. If the units are set
to different OCP levels, the paralleled system will trip according to the lowest setting. For
ease of use, adjust the OCP levels for the slaves to maximum and adjust the master OCP
level to the desired setting.
3.8.2
S
ERIES
O
PERATION
Series operation is used to obtain a higher voltage single output supply using
two units. Connect the negative terminal (–) of one supply to the positive
terminal (+) of the next supply of the same model. The total voltage available is
the sum of the maximum voltages of each supply (add voltmeter readings).
Notes:
Under no condition should the negative (–) output terminal of any power supply exceed
300V to Earth ground. This is limited by the creepage/clearance distances internal to the
construction for Non-isolated Analog programming supplies. (600V for supplies with the
Isolated Analog option installed). If a higher output voltage range is required, contact the
Sorensen Sales Department or Customer Service for availability.
The maximum allowable current for a series string of power supplies is the rated output
current of a single supply in the string.
Remote sensing should not be used during series operation.
A free-wheeling diode (power diode capable of the maximum current of the series set
connected in parallel, but reverse biased) is recommended to protect against sinking
current into a supply should one supply be “ON” while the other is “OFF.”
M550292-01 Rev C 3-17