Product specifications

134
Power Products AC Power and Load Connections (Continued)
Applications Information
More detailed specifications at www.agilent.com/find/power
circuit necessary. To determine
whether connecting remote sensing
has changed the current limit setting,
turn off the supply, short terminal
-S to -OUT and +S to +OUT at the
power supply, and check whether
the current limit value differs from
the value without these terminals
shorted. If it does differ significantly,
the current limit control needs
readjustment.
Making Load Connections to
Two or More Power Supplies in the
Same System
The following four rules must also be
observed in extending the preceding
techniques to systems containing
two or more power supplies.
DC Distribution Terminals
RULE 1. There must be only one point of
connection between the DC outputs of
any two power supplies in the multiple
power supply system. This point must
be designated as one of the two DC
distribution terminals for those two
power supplies.
Thus there are always exactly (N+1)
DC distribution terminals in any
system, where N is the number of
power supplies. (This is true unless
parallel supplies share the same dis-
tribution terminals, or supplies are
connected in series with no other
connections to their intermediate
terminals).
Figure 13
A properly connected multiple
power supply system
DC Common Point
RULE 2. One of the (N+1) DC distribution
terminals must be designated as the
DC common point for the system.
There can be only one DC common
point allowed in a system.
DC Ground Point
RULE 3. There must be only one
DC ground point in a multiple power
supply system.
This rules out the possibility of
connecting two grounded loads in
the same system.
RULE 4. There must be only one
conductive path between the system
DC common point and the system
DC ground point.
This rule is repeated from Step 7
above as a reminder because of the
far greater number of possible paths
to ground in a multiple power supply
system. Figure 13 shows an example
of a properly connected and ground-
ed multiple power supply system.
Load
No. 1
Load
No. 3
Load
No. 2
C1
C2A
C
A
C2B
C3
GP
+
C
B
+
S.G.
Power Supply ”A“
+S
1
+
-S
GND
-
S.G.
Power Supply ”B“
+S
1
+
-S
GND
-
DT
DT
DT & CP
S.G = “Safety Ground” lead in power cord
GND = Power supply ground terminal
C
A
, C
B
= Power supply output capacitors removed and placed across DT’s
C1, C2, C3, = Load decoupling capacitors
1 Power supply chassis ground connection via 3rd wire
saftey ground lead and rack frame.