59
83-530-000 Rev J
6.2. Parallel Operation
Up to four units of the SAME VOLTAGE and CURRENT RATING can be connected in
parallel to provide up to about four times the output current capability of one supply. One of
the units operates as a master and the remaining units are slaves. The slave units are
analog programmed by the master unit.
In remote digital operation (RS232/485, IEMD or LAN), only the master unit is programmed
by the computer although measurements and status may be read back from the slaves.
In the simplest parallel setup, the slaves output current merely follows the master’s. A
shut-off daisy chain may be added so when one supply output turns off or on, they all will.
The Advanced Parallel option is a firmware setting which adds operator convenience by
making the Master show the sum of all supply’s currents while the slave front panels are
disabled.
6.2.1. Basic Parallel Operation
In this method, setting the units as Master and Slaves is made by the rear panel J1
connections and the setup switch SW1. Each unit displays its own output current and
voltage.
CAUTION
Make sure that the connection between –V terminals is reliable to avoid
disconnection during operation.
Disconnection may cause damage to the power supply.
NOTE
With local sensing it is important to minimize the wire length and resistance. Also
the positive and negative wire resistance should be close as possible to each
other to achieve current balance between power supplies.
6.2.2. Setting up the Master Unit
First understand if your load is being driven by a regulated voltage (CV mode) or a
regulated current (CC mode).
For a voltage driven load (CV): set the slaves for voltage limits that are higher
than will be reached by the master.
For a current driven load (CC): the Master unit should be programmed to the total
load current divided by the number of units in the system. The slaves must be set
to voltage limits higher than will be seen at the master.
The master may use local voltage sensing as shown in Figure 6-4. For a voltage driven
load (CV), the master may use remote voltage sensing to the load as shown in
Figure 6-5.
To Next Page
Loading...