Master
Slave
Slave
L c J
G
N
F L
c
J
G
N
F
L
c
J
G
+
+
+
+
+
+
D
H
D
H
D
H
-5 -
t
+
+S
-s -
0
�
+S
-s -
0
�
+
Load
Figure 13
As
long as the output current is less than the RAC PAC set to 30, 2 V can
�;upply,
the output voltage will be 30, 2 V .
'Nhen this unit reaches its current limit, the other RAC PAC will take over
the remaining current and stabilize at 30, 0 Vo
N
-+-s
If
this output characteristic cannot be accepted, use the ''Master-Slave paral
lel
operation", as described in s ection 3L.
L.
M A S TER - S L A V E PA R A L L E L O P E R A T I O N , R E M O T E
S E N S I N G
Jf
the voltage step in the output characteristic, caused by different voltages
from the parallel connected power supplies , described above, cannot be
accepted, a "Master-Slave" configuration can be us ed. In such a case the
data from the parallel connected power supplies are identical
to
these from
the RAC PAC that is operating as " Master" .
·
Connect all RACPAC'S according to figure 1 3 .
2.
Set "Normal- Parallel" switch o n main PC-board in postition "Parallel"
on all "Slaves" . ("Normal'' on "Master") .
3.
"Sense" switch on all RAC PAC 'S in position "EXT"� including "Master".
4.
The cable from "Master"
+
output to load
+
should have same resistance
(same area and same length) as cables from "Slave''
+
output to load
+.
5.
With this method, RAC PAU'S of various models can successfully be connec
ted in parallel. The current will automatically be shared, so
tr.at
all
RAC PAC'S give the same current in percentage of their maxi.mum rating.
6. Set desired voltage with voltage control on the " Master'' and to maxi.mum
on the "Slaves" .
7.
Switch off the OVP (See s ection 3Ad) .
M.
C O N S T A N T C U R R E N T W I T H C U R R E N T L I M I T C O N T R O L
The simplest method to obtain constant current in the load is achieved by
using the current limit function.
17
