Elektro-Automatik PS 8000 2U Serie Bedienungsanleitung Seite 38

Operating the device
7. Behaviour of the device
7.1 Switching on by power switch
The power switch is located at the front. After switching on, the
device will show some information in the display: manufacturer's
name, address and logo, device type and firmware version. In
the device setup there is an option „AutoPwrOn" (auto power-on,
see section „8. Device setup") that determines the output con-
dition after the device is switched on. Default is „on". It means,
that the set values of U, I, P, the values of OVP and UVL and
the output condition are restored to what was present when
the device was switched off the last time. In case the option is
set to „off", the set values of U and I are set to 0, the set value
of P to 100% and the output is switched on after every start.
7.2 Switching off by power switch
Switching the device off by power switch is handled as mains
blackout. The device will save the last set values and output
condition. After a short time, power output and fans will be
switched off and after a few seconds more, the device will be
completely off.
7.3 Switching to remote control
a) Analogue interface: Pin „Remote" switches the device to
remote control by the set values pins VSEL, CSEL and PSEL
(only models from 1kW), as well as REM-SB, if not inhibited
by LOCAL mode or remote control by digital interface already
being active. The output condition and the set values which are
put into pins 1, 2 and 13 (also see section „10. The analogue
interface") are immediately set. After return from remote control,
the output will be switched off and the last remotely adjusted
set values of U, I and P are kept.
b) Digital interface: Switching to remote control by the corre-
sponding command (here: object), if not inhibited by LOCAL
mode or remote control via AI already being active, keeps
output state and set values until altered. Returning from remote
control switches the output off and the last, remotely adjusted
set values of U, I P, OVP and UVL are kept.
7.4 Overvoltage occurs
An overvoltage error can occur due to an internal defect (output
voltage rises uncontrolled) or by a too high voltage from external.
The overvoltage protection (OVP) will switch off the output and
indicate the error on the display by the status text „OVP" and
on the pin „OVP" of the analogue interface.
External voltages higher than 120% nominal voltage at the
output must be avoided, or else internal components of the
device might be destroyed!
If the cause of the overvoltage is removed, the output can be
switched on again and status text „OVP" will disappear. This
is considered as acknowledgement. In manual operation, it
is done by pushing button Output On, in analogue remote
control with pin „REM-SB" and in digital remote control by the
corresponding command. If the error is still present, the output
is not switched on.
OVP errors are recorded as alarm into the internal alarm buffer.
This buffer can be read out via the digital interface. Reading the
buffer will also acknowledge.
Note: The status of an OV error has priority over the status of
an OT error and will overwrite the status text „OT" in case both
errors occured the same time and are not acknowledged yet.
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Date: 08-15-2011
7.5 Overtemperature occurs
Ambient temperatures higher than specified must be avoided!
As soon as an overtemperature (OT) error occurs by internal
overheating, the output is switched off and the status text „OT"
is indicated.
Simultaneously, the LED „Output On" will flash, indicating that
the output will automatically switch on again as soon as the
device has cooled down. In case this is not wanted, the output
can be manually switched off. Then the LED stops flashing and
the output won't switch automatically on.
OT errors have to be acknowledged. If the output is off after the
device has cooled down, this is done by switching the output on
using button Output on or pin „REM-SB" or the corresponding
command. If the output is on, acknowledgement is done by
pushing the button Output on once or giving pin „REM-SB"
a high-to-low toggle or using the corresponding command to
switch the output off.
OT errors are recorded as alarm into the internal alarm buffer.
This buffer can be read out via the digital interface.Reading the
buffer will also acknowledge.
OT error status has lower priority than OV error status. In case
an OV error occurs while an OT error is present and indicated,
the status text „OT" will be overwritten by „OVP".
7.6 Voltage, current and power are regulated
The output voltage of the power supply and the resistance of
the load determine the output current. If this current is lower
than the current limitation set by the current set value, then the
device is working in constant voltage (CV) regulation, indicated
by the status text „CV".
If the output current is limited by the current set value or by the
nominal current, the device will change to constant current (CC)
regulation mode, indicated by the status text „CC".
Most models from 1kW output power additionally feature an
adjustable power limitation for 0...P
overrides constant voltage or constant current regulation mode,
if the product of actual current and actual voltage exceeds the
adjusted power limitation. The power limitation primarily affects
the output voltage. Because voltage, current and power limita-
tion affect each other, various situations like these may occur:
Example 1: the device is in constant voltage regulation, then the
power is limited down. As a result, the output voltage is decre-
ased. A lower output voltage results in a lower output current.
In case the resistance of the load is then decreased, the output
current will rise again and the output voltage will sink further.
Example 2: the device is in constant current regulation, the
output voltage is defined by the resistance of the load. Then
the power is limited down. Output voltage and current are
decreasing to values according to the formula P = U * I. If the
current set value is then decreased, the output current would
also decrease and thus the output voltage. The product of both
values, the actual power, would sink below the previously set
power limit and the device would change from constant power
regulation (CP) to constant current regulation (CC).
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Instruction Manual
PS 8000 2U Series