Do not connect power supplies from different
manufacturers in series or in parallel.
CAUTION
When power supplies are connected in series, and
the load or one of the output terminals is grounded,
no point may be at a greater potential of +/-60VDC
from ground for models up to 60VDC Rated Output
and +/-600VDC from ground for models >60VDC
Rated Output. When using RS232/485 or IEEE, refer
to the OUTPUT TERMINALS GROUNDING
warning, section 3.9.11.
5.14.1 Series connection for increased output voltage
In this mode, two units are connected so that their outputs are summed. Set the current limit of
each power supply to the maximum that the load can handle without damage. It is
recommended that diodes be connected in parallel with each unit output to prevent reverse
voltage during start up sequence or in case one of the units shuts down. Each diode should be
rated to at least the power supply rated output voltage and output current. Refer to Fig.5-1 and
5-2 for series operation with local and remote sensing.
+S
+
-
-S
-LS
+LS
POWER
SUPPLY
+S
+
+
-
-
-S
-LS
+LS
POWER
SUPPLY
LOAD
+S
+
-
-S
-LS
+LS
POWER
SUPPLY
+S
+
+
-
-
-S
-LS
+LS
POWER
SUPPLY
LOAD
Fig.5-1: Series connection, local sensing
Fig.5-2: Series connection, remote sensing
Remote programming in series operation for increased output voltage:
1.Programming by external voltage:
2.Using the SO function and PS_OK signal:
The analog programming circuits of this power supply
are referenced to the negative Sense (-S) potential.
Therefore, the circuits used to control each series
connected unit must be separated and floated from
each other.
The Shut-Off and PS_OK circuits are referenced to the
isolated interface common, IF_COM (J1-2,3). The
IF_COM terminals of different units can be connected
to obtain a single control circuit for the power supplies
connected in series.
(*)
(*)
(*)
(*)
(*) Diodes are
user supplied.
WARNING
39
