3.5.2
Master/Slave Connection (Figure 3-11)
The voltage range of a DCR-B power supply system can be increased by series
-connecting units up to a total rated output of 200 Vdc (150/300/600 volt models,
two in series) in a master/slave configuration.
Two 40 volt supplies thus
connected provide O to 80 volt range capability with voltage programming neces
sary only on one unit. External components required -·are two wire-wound resis
tors (RA and RB in the figure), a 15 µF bypass capacitor to eliminate noise feed
through and a shunt power rectifier across the output terminals of each unit.
Assuming two supplies with the same output ratings are to be used, ( consult
factory for 'connecting dissimilar units), connect as shown in Figure 3-11. RA
and RB are low TC, wire-wound resistors of 5 watts rating or greater. Resis
tance values for two identical units in series have been calculated for all voltage
ranges in the DCR-B series, and are summarized in Table 3-2. Recommended
types of power rectifier are listed in Table 3-3 for each application.
NOTE
For more than two units (with identical output
ratings) connected in series, RB remains 10K,
and RA is calculated using the formula:
RA = 10
3
(Vo - 10)/X
where Vo is the voltage of the master supply,
and X is the number of units in the system.
MASTER
TB3
T 81
I
I
I
I
1SuF 20V
LOAD
SLAVt.
CR2
See Table 3-2 for resistor values
See Table 3-3 for diode values
Figure 3-11 Master /Slave Connections Series Operation
Operation
3-16
Rev B (6/84)
