AMETEK SGI Series - Manual (Page 108)

Calibration and Verification Sorensen SGI Series
3-56 M550221-01 Rev AA
3.16 Parallel and Series Operation
Parallel and series modes of operation are used for applications requiring
more current or voltage than is available from a single power supply. To meet
the requirements for greater output current or voltage, up to five supplies could
be connected in parallel, or up to two supplies could be connected in series.
3.16.1 Parallel Operation
In order to connect up to five power supplies in parallel, use a “Master/Slave”
daisy-chain wiring configuration as follows; refer to Figure 3-26:
(There are two separate 9-pin connectors on the upper left rear panel of each
power supply, marked “PAR OUT” and “PAR IN”).
1. Programming, readback, and control is performed through the Master.
2. Beginning with the power supply that is to function as the Master, use an
interface cable (P/N 890-453-03) to connect the PAR OUT connector on
the designated Master power supply to the PAR IN connector on the
second power supply (Slave 1).
3. On the second power supply (Slave 1), use another interface cable to
connect the PAR OUT connector to the PAR IN connector of the third
power supply (Slave 2). Continue these interconnections up to a
maximum of 5 power supplies.
4. Connect the Positive output terminals of all the power supplies and the
load.
5. Connect the Negative output terminals of all the power supplies and the
load.
6. Confirm that there are no shorts between the Positive and Negative
output terminals.
7. Referring to Figure 3-26, connect twisted-pair sense cables as follows;
ensure that all twisted-pair cables are as short as possible:
All slave units shall have twisted-pair cables from their sense terminals to
their own output terminals.
For remote sense at the load, the master unit shall have a twisted-pair
cable from its own sense terminals to the load terminals.
For remote sense at the output terminals (local sense connection), the
master unit shall have a twisted-pair cable from its own sense terminals to
the output terminals of its own chassis.
Note:
The OVP circuit remains active for all units in parallel operation. If the
units are set to different OVP levels, the paralleled system will trip according to
the lowest setting. For ease of use, adjust the OVP levels for the slaves to
maximum and adjust the master OVP level to the desired setting.