AMETEK XFR 2800 Watt Series - Manual (Page 65)

Using Multiple Supplies
TM-F2OP-C1XN-01 3-13
Configuring Multiple Supplies for Parallel Operation
Use parallel operation to obtain a higher current through a single output
using two or more supplies. Set all of the OVP setpoints to maximum.
(See “Using Over Voltage Protection (OVP)” on page 3–7.) Set all of the
outputs to the same voltage before connecting the positive (+) output
terminals and negative (–) output terminals in parallel. See Figure 3-3.
The total current available is the sum of the maximum currents of each
supply.
When operating multiple supplies in parallel, the operating mode of each
supply depends on the load current being drawn. For example, with two
40 V, 70 A power supplies operating in parallel with a 100 A load, one
supply operates in constant current mode supplying 70 A and the other
supply operates in voltage mode supplying the remaining 30 A. The level
of current sharing between units depends on how accurately the output
voltages are matched.
Note:If you do not fix the OVP setpoints at maximum, the OVP circuit
may trip on one unit, reducing the current available to the load.