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PSI 10000 4U Serie
3.11.1.3
Wiring the Share bus
The Share bus is wired from unit to unit with standard BNC cables (coaxial, 50 Ω type) with a length of 0.5 m (1.64
ft) or similar. Both sockets are internally connected and are not specifically input or output. The labeling is only for
orientation.
A max. of 64 units can be connected via Share bus.
3.11.1.4
Wiring and set-up of the digital master-slave bus
The master-slave connectors are built-in and can be connected via network cables (≥CAT3, patch cable). After
this, MS can be configured manually (recommended) or by remote control. The following applies:
•
A maximum of 64 units can be connected via the bus: 1 master and up to 63 slaves.
•
Connection only between devices of same kind, i.e. power supply to power supply, and of the same model, such
as PSI 10080-1000 4U to PSI 10080-1000 4U.
•
Units at the end of the bus should be terminated, if necessary (see below for more information)
The master-slave bus must not
be wired using crossover cables!
Later operation of the MS system implies:
•
The master unit displays, or makes available to be read by the remote controller, the sum of the actual values
of all the units
•
The ranges for setting the values, adjustment limits, protections (OVP etc.) and user events (UVD etc.) of the
master are adapted to the total number of units. Thus, if e.g. 5 units each with a power of 30 kW are connected
together to a 150 kW system, then the master can be set in the range 0...150 kW.
•
Slaves are no operable as long as being controlled by the master
•
Slaves which haven’t yet been initialized by the master will show the alarm “MSP” in the display. The same alarm
is signaled upon MS bus errors.
1.
Switch off all units and connect the master-slave bus with network cables (CAT3 or better, cables not includ
-
ed). It doesn’t matter which of the two master-slave sockets (RJ45, backside) is connected to the next unit.
2.
Depending on the desired configuration the units are then also connected at their DC
terminals. The two units at the beginning and end of the chain should be terminated, if
long bus cables are in use or when bus problems occur. Termination is done with internal
electronic switches which are controlled from within the
Settings
menu of the device in
group
Master-slave
.
They allow to separately enable the actual termination resistor (TERM) and the BIAS
resistors.
Typical termination: only resistor
TERM
is switched on.
In case only terminating the bus itself doesn’t suffice, the BIAS resistors can be added.
Extended termination: BIAS and TERM are enabled
R
R
+
B
A
BIAS
BIAS
MS
Bus
R
TERM
3.11.1.5
Configuring the master-slave operation
Now the master-slave system has to be configured on each unit. It’s recommended to configure all the slave units
first and then the master unit.
►
Step 1: Configuring all slave units
1.
While the DC output is switched off, tap on
in the main screen to access the
Settings
menu. Swipe
up to find group
Master-slave
and tap it.
2.
Tapping on the blue button text next to
Mode
will open a selector. By selecting
Slave
, if not already set, the
master-slave mode is activated and the device is defined as slave.
3.
Leave the Settings menu.
If function generator operation is setup for the master-slave system, the last step of the configu
-
ration requires to set global set values. These are important to be set to proper levels, because
they are transferred to the slave units, which else would remain being set to 0 V, 0 A and 0 W.
After this, the slave is fully configured for master-slave. Repeat the procedure for all other slave units.
