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www.eps-germany.de
PSI 10000 4U Serie
►
Step 2: Configuring the master unit
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
Master
, if not already set,
the master-slave mode is activated and the device is defined as master.
►
Step 3: Initializing the master
When setting a device to Master, the device will instantly try to initialize the MS system and the result is displayed
in the very same window. In case the initialization is not successful or the number of units or the total power is
wrong, it can be repeated in this screen anytime.
Tapping
Initialize system
repeats the search for slaves in case
the detected number of slaves is less than expected, the system
has been reconfigured, not all slave units are already set as
Slave
or the cabling/termination is still not OK. The result window
shows the number of slaves plus the total current, power and
resistance of the MS system.
In case there are no slaves found at all, the master will still
initialize the MS system with only itself.
As long as MS mode remains activated, the initialization process of the master-slave system
will be repeated each time the master unit is powered. The initialization can also be repeated
manually anytime via the Settings menu, in group “Master-Slave”.
3.11.1.6
Operating the master-slave system
After successful configuration and initialization of the master and slave units, they will show their status in the in
the status area of their displays. The master would show
MS mode: Master
while the slave(s) would show
MS
mode: Slave
plus
Remote: Master-slave
, as long they are in remote control from the master.
From now on the slaves can no longer be controlled manually or remotely, neither via the analog nor via digital
interfaces. They can, if needed, be monitored via these interfaces by reading actual values and status.
The display on the master unit will reconfigure after initialization and all set values are reset. The master now dis
-
plays the set and actual values of the total system. Depending on the number of units, the adjustable current and
power range will multiply, while the resistance range will decrease. Then following applies:
•
The system, represented by the master, can be treated like a standalone unit
•
The master shares the set values etc. across the slaves and controls them
•
The master is remotely controllable via the analog or digital interfaces
•
All settings for the set values U,I, P and R on the master, plus also all related values from supervision, limits etc.
should be adapted to the new total values
•
All initialized slaves will reset any limits (U
Min
, I
Max
etc.), supervision thresholds (OVP, OPP etc.) and event settings
(UCD, OVD etc.) to default values, so these don’t interfere the control by the master. As soon as these values
are modified on the master, they are transferred 1:1 to the slaves. Later, during operation, it might occur that a
slave causes an alarm or an event earlier than the master, due to imbalanced current or slightly faster reaction.
In order to easily restore all these settings to what was configured before activating MS operation,
it’s recommended to make use of the user profiles (see “3.9. Loading and saving user profiles“
•
If one or more slaves report a device alarm, it will be signaled on the master and must be acknowledged also
there. so that the slave(s) can continue their operation. Since an alarm causes the DC outputs to be switched off
and can only reinstate the on/off condition automatically after PF or OT alarms, where the reaction to the alarms
is configurable, action from an operator or a remote control software may become necessary.
•
Loss of connection to any slave will result in shutdown of all DC outputs as a safety measure and the master
will report this situation in the display with a pop-up telling “Master-slave security mode”. Then the MS system
has to be re-initialized, either with or without prior re-establishment of the connection to the disconnected unit(s).
•
All units, even the slaves, can be externally shut down on their DC outputs using the pin REM-SB of the analog
interface. This can be used as some kind of “emergency off”, here usually a contact (maker or breaker) is wired
to this pin on all units in parallel.
