68
EN
Operating Guide
PSI 8000 2U Series
Date: 28-06-2012
12.2 Firmware update
A firmware update of the device should only be done if the
device shows erroneous behaviour or if new features have
been implemented.
In order to update a device, it requires a certain digital inter-
face card, a new firmware file and a Windows software called
„Update tool“.
These interfaces are qualified to be used for a firmware update:
•
IF-U1 (USB)
•
IF-R1 (RS232)
•
IF-E1 (Ethernet/USB)
•
IF-PB1 (Profibus/USB)
In case none of the above interface types is at hand, the device
can not be updated. Please contact your dealer for a solution.
The update tool and the particular firmware file for your device
are obtainable from the website of the device manufacturer, or
are mailed upod request. The update too will guide the user
through the semi-automatic update process.
12.3 Option: Internal resistance
The unlockable option „internal resistance“ adds an imaginary,
variable resistor to the internal voltage source of the power sup-
ply. After this option has been unlocked, the „R mode“ or U/I/R
mode can be activated in the menu
Setup operation mode
(see section „7.1 Defining operation parameters“) by switching
from U/I/P resp. U/I to U/I/R. The voltage set value is related to
the off-load voltage U
o
of the power supply. The off-load voltage
is reduced by the product of I
act
Ri
set
. The resulting voltage is
calculated as follows:
I set, P set
U
Set
= (U
0
- I
Act
•
Ri)
Clarification:
Using the power supply
CR
is shown in the display while the internal resistance
control is in control.
The internal resistance Ri
set
is displayed instead of the power
P
set
while U/I/R mode is active. However, the actual value of
the power is still displayed.
Following restrictions apply for U/I/R mode:
•
For models with adjustable power: activating U/I/R mode
disables direct power value adjustment. The global output
power can then only be set in the menu with the parame-
ter „
Padj max.
“. When activating U/I/R mode, that value is
instantly set as power set value for the output. It can be
subsequently adjusted, too.
•
The resistance set value can not be controlled via the internal
or the optional analog interface. Therefore, remote control
by analogue interface is not possible as long as U/I/R mode
is active
•
Parallel or series connection of multiple units running in U/I/R
mode is not possible and thus not allowed!
•
It is not recommended to use the function manager while U/I/R
mode is active, though it is possible. The resistance regulation
will significantly slow down the function manager operation.
The unlock code can be purchased at the sales company who
sold the power supply. The serial number of the unit is required
to be told when purchasing the option, because the unlock code
is related to it.
12.4 Trouble-shooting
Problem:
The device won‘t set the desired voltage, but less,
or does not provide the requested power
Possible cause: The device is in current limitation or power
limitation (manually set or derating)
Possible solution: in case the device is in derating, i.e. automa-
tic power reduction due to low input voltage (see „10.3 Mains
undervoltage or overvoltage“), it is usually sufficient to bring the
input voltage to the required level. It is critical, that the voltage
level is sufficient at the AC input socket of the device not at the
socket/terminal, where the AC supply cable is plugged. Long
AC supply cables can cause high voltage drops.
Anyway, current and power limitation belong to the common
features of a power supply and they occur depending on the
adjusted values and the connected load. The output voltage
of a DC power supply will never reach the adjusted level, if
the product of the desired voltage value and the actual output
current would exceed the adjusted or maximum power limit.
