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83
-
507
-
013 Rev. D
39
+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
(*)
(*)
(*)
(*)
(*) Diodes are
user supplied.
5.14 SERIES OPERATION
Power supplies of the SAME MODEL can be connected in series to obtain increased output voltage.
Split connection of the power supplies gives positive and negative output voltage.
5.14.1 Series connection for increased outp
ut voltage
In this mode, two units are connected so that their outputs are summed. Set the Current of each
power supply to the maximum that the load can handle without damage. It is recommended that d
i-
odes be connected in parallel with each unit output to
prevent reverse voltage during start up s
e-
quence or in case one unit 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 r
e-
mote sensing.
Remote programming in series operation for increased output voltage:
1. Programming by external voltage:
The analog programming circuits of this power supply
are referenced to the negative output potential. Ther
e-
fore, the circuits used to contro
l each series connected
unit must be separated and floated from each other.
2. Using the SO function and PS_OK signal: 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 co
n-
nected in series.
CAUTION
Do not connected power supplies from diffe
r
ent
ma
nufacturers in series or in parallel.
WARNING
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 mod
els up to 60VDC Rated Output and +/
-
600VDC from ground for
models >60VDC Rated Output. When u
s
ing RS232/RS485 or IEEE, refer to the
OUTPUT TERMINALS GROUNDING warning in Section 3.9.11.