AMETEK SGA Series - Manual (Page 81)

Sorensen SGA Series Operation
M550129-01 Rev AG 3-31
3.11.2 SERIES OPERATION
Series operation is used to obtain a higher aggregate output voltage using
two units. Each supply is operated individually, and is set up as follows:
Connect the negative terminal ( –) of one supply to the positive terminal (+) of
the next supply; both units must be of the same model. The total voltage
available is the sum of the maximum voltages of each supply. Each supply
displays its own output voltage, and the load voltage is the sum of each front
panel display.
CAUTION!
Under no condition should the negative ( –) output terminal of any
power supply exceed 300 V to chassis (earth) ground. This is limited
by the isolation and creepage/clearance distances internal to the
power supply construction. If a higher output voltage range is
required, contact the factory for availability.
Note:
1. The maximum allowable current for a series string of power supplies is the rated
output current of a single supply of the string.
2. Remote sensing at the load should not be used during series operation. Each
power supply should have its remote sense leads connected to its own output
terminals.
3. An anti-parallel diode (power diode capable of the maximum current of the series
group, connected across the output, but reverse biased) is recommended to protect
against sinking current into a supply should one supply be ON while another other is
OFF, as shown in Figure 3-26. Diode D2 shown in the figure is optional, if the load
has stored energy such as a battery (Refer to Section 2.6.1).