56
GMC-I Messtechnik GmbH
5.10.2 Master-Slave Series Connection
Functions
As opposed to direct series connection, master-slave series
connection offers significant
advantages
:
Equally suitable for
voltage
and
current regulation
Output parameters
(cumulative output voltage, current limiting,
output on/off) are set
entirely
by the
master device
.
All interconnected KONSTANTERs are
equally loaded
.
Connection
Define
one power supply as a
master device
.
Connect
master
and
slave
devices as shown in Figure 5.10.2.
Connect the
output leads
to the
series circuit phase terminals
.
Balance
the individual
output voltage values
with
R
sym
.
Balancing
can be
simplified
and
optimized
by combining a fixed
resistor (metallic layer,
T
k
50 ppm / K) and a trimming resistor for R
sym
.
Figure 5.10.2
Wiring for Master-Slave Series Connection
Settings
Initial power-up:
Do not load the outputs (idle).
Switch the
master
on (mains) and
configure
settings:
SIG1 out
Pon rcl
OUTPUT
off
USET =
Uset / n
Uset: Cumulative output voltage
n: Number of devices
Only valid if
nominal data
are
identical
for all
devices, see notes
ISET =
Iset
Current limit value
Switch
slave 1
on and
configure
:
trG out
SIG1 out
Pon rcl
USET = 0 V
The
USET rotary knob can be deactivated if
desired by setting ULIM to 0 V.
ISET > ISET
master
The current setpoint at the slave devices must
be set at least 1% higher than at the master
device, e.g. to maximum.
Use the same procedure for additional slave devices.
Press the
OUTPUT ON
key at the master.
All slave
outputs are
switched on simultaneously
and
configured
.
Check output voltage at the KONSTANTER displays.
Output voltage at each of the slaves
can be precisely
matched
to master
output voltage by adjusting
R
sym
. Changes appear immediately at the
respective display.
Connect the load.
From this point on,
setting
and
regulation
of (cumulative) output
parameters are controlled
entirely
by the
master
device.
Power-up after initial settings:
Devices can be switched on and off in
any desired order
.
Functional Principle
The master controls output voltage of the downstream
KONSTANTER (slave 1) via the slave’s
voltage control input
with
the help of the
voltage monitoring signal
.
Slave 1 functions
as a
master
device for the next downstream
slave (
slave 2
), and so forth.
Cumulative output voltage is thus always proportional to
master output voltage.
The master controls the
output on/off status
of the slave devices via the
connection
from the
master SIG1 output
(
SIG1 out
setting
) to the
Slave TRG
input (
trG out
setting
).
Notes:
KONSTANTERs with Differing Nominal Values
The KONSTANTER with the
smallest nominal current
value must
always be used as the
master
device.
The
current setting range
of the other KONSTANTER must be
limited
to this lowest value with the
ILIM
parameter.
Slave output voltage
Uout
corresponds to master output
current
Uout
as a percentage only, relative to
U
nom
.
Example:
General
If analog interface connector cables and the sensing leads are
longer than 1 meter
,
shielded
cable should be used.
The
shield
is connected to the
ground terminal on the housing
or
to
OUT
.
The same current value is available from all KONSTANTERs.
For this reason,
current measured at the master device
is sufficient
for the measurement of
load current
.
The
individual measured voltage values
for each of the
interconnected KONSTANTERs must be
added
together in
order to arrive at
cumulative output voltage
.
Slave,
Nominal Voltage
R
sym
,
Nominal Value
R
sym
,
Combination
20 V
40 k
/ 0.2 W
36 k
+ 10 k
pot
40 V
80 k
/ 0.2 W
75 k
+ 10 k
pot
80 V
160 k
/ 0.2 W
150 k
+20 k
pot
SSP KONSTANTER
SSP KONSTANTER
SSP KONSTANTER
+ SENSE
OUT
OUT
SENSE
Analog Interface
SIG1 OUT
SIG2 OUT
TRG IN
TRG IN
+15 V
AGND
Uset
Uset +
Iset +
U-MON
I-MON
+ OUT
+ OUT
Master
Settings
USET = Uset / n
ISET = Iset
OUTPUT on/off
+ SENSE
OUT
OUT
SENSE
Analog Interface
SIG1 OUT
SIG2 OUT
TRG IN
TRG IN
+15 V
AGND
Uset
Uset +
Iset +
U-MON
I-MON
+ OUT
+ OUT
Slave 2
Settings
USET = 0 V
ISET > Iset master
OUTPUT on
Load
R
sym
R
sym
+ SENSE
OUT
OUT
SENSE
Analog Interface
SIG1 OUT
SIG2 OUT
TRG IN
TRG IN
+15 V
AGND
Uset
Uset +
Iset +
U-MON
I-MON
+ OUT
+ OUT
Slave 1
Settings
USET = 0 V
ISET > Iset master
OUTPUT on
Output
Output
Output
= Only required for sensing mode operation
trG out
SIG1 out
trG out
SIG1 out
Master
:
SSP 120-40
U
nom
40 V
I
nom
6 A
Settings:
USET
: 12 V (30%)
ISET
:
3 A
Slave 1
: SSP 120-20
U
nom
20 V
I
nom
10 A
Results in
Uout
:
6 V (30%)
Iout
:
3 A
Slave 2
: SSP 120-40
U
nom
40 V
I
nom
6 A
Results in
Uout
:
6 V (30%)
Iout
:
3 A
Содержание SSP 120 Series
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