GMC-I Messtechnik GmbH
37
7.10.2 Master-Slave Series Connection
Function
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) are set entirely by the master device.
•
All interconnected KONSTANTERs are equally loaded.
Wiring
•
Define one power supply as a master device.
•
Connect master and slave devices as shown in figure 7.10.2.
•
Connect the output leads to the series circuit phase terminals.
•
Balance the individual output voltage values with Rsym.
Figure 7.10.2
Wiring for Master-Slave Series Connection
Settings
Initial power-up:
•
Do not load the outputs (idle).
•
Switch the master on (mains) and configure settings:
(Pon rcl) if desired
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:
(Pon rcl) if desired
USET = 0 VThe USET rotary knob can be deactivated if
applicable by setting ULIM to 0 V.
ISET > ISETmaster
The current setpoint at the slave devices must
be set at least 1% higher than at the master
device, e.g. to maximum.
SEtUP/dPYIF/AI_U on
Activates the analog voltage setpoint
•
Use the same procedure for additional slave devices.
•
Press the OUTPUT ON key at the master.
•
Check output voltage at the KONSTANTER displays.
•
Output voltage at each of the slaves can be precisely
matched to master output voltage by adjusting Rsym.
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.
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 KONSTANTERs must be
limited to this lowest value with the ILIM parameter.
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.
General
•
Rsym can be implemented as a 2 k
fixed resistor; adjusting
error for the slaves is increased somewhat as a result.
•
If Rminus is omitted, the standard value for Rsym is increased
to 122 k
.
•
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.
•
In order to assure that the slaves’ OUTPUT ON status is
activated along with the master’s OUTPUT ON status via the
signal output and trigger input circuit as shown in figure
7.10.2, “SEtUP/dPYIF/AnIF/SiG-(x1) out” must be selected at
the master and “SEtUP/dPYIF/AnIF/trG-(x2) out” must be
selected at the slaves, (x1) and (x2) in example 1.
The master’s OUTPUT ON status can be optionally controlled
via the trigger input – setting at the master:
“SEtUP/dPYIF/AnIF/trG-(x3) out”, (x3) in example 1.
PSP-KONSTANTER 2
Einstellung
USET = 0 V
ISET = Inenn
OUTPUT ON
SEtUP/dPYIF/AnIF/AI_U
on
(SEtUP/dPYIF/AnIF/trG-1
out
)
Analog Interface
TRG 1 +
1
TRG 1 -
2
TRG 2 +
3
TRG 2 -
4
SIG 1 +
5
SIG 1 -
6
SIG 2 +
7
SIG 2 -
8
SIG 3 +
9
AGND 2
10
+15V 11
AGND 1
12
Uext +
13
Uext -
14
Iext +
15
Iext -
16
U MON
17
I MON
18
SENSE +
19
SENSE -
20
+OUT
í
OUT
PSP-KONSTANTER 1
Einstellung
USET = Usoll/n
ISET = Isoll
OUTPUT ON
(SEtUP/dPYIF/AnIF/SIG-1
out
)
(SEtUP/dPYIF/AnIF/trG-1
out
)
Analog Interface
TRG 1 +
1
TRG 1 -
2
TRG 2 +
3
TRG 2 -
4
SIG 1 +
5
SIG 1 -
6
SIG 2 +
7
SIG 2 -
8
SIG 3 +
9
AGND 2
10
+15V 11
AGND 1
12
Uext +
13
Uext -
14
Iext +
15
Iext -
16
U MON
17
I MON
18
SENSE +
19
SENSE -
20
+OUT
í
OUT
Last
optional
Us
í
í
í
í
= optionale Senseverbindung
Rsym
5 k
Rminus
10 k
Slave Master
Summary of Contents for P1500
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