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Operating the device
7. Behaviour of the device when...
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 (see section „8. Device setup") there is an
option „AutoPwrOn" (auto power-on) that determines the out-
put condition 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) By analogue interface: Pin 5 „REMOTE" switches the device
to remote control via the set values pins VSEL (pin 1), CSEL
(pin 2) and PSEL (pin 8), as well as the status input REM-SB
(pin 13), 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, 8 and 13 (also see
section „10. 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) By an optional, digital interface: Switching to remote control
by the corresponding 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 „OV" and on
the pin 14 „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 „OV" will disappear. This is
considered as acknowledgement. In manual operation, it is
done by pushing button Output, in analogue remote control
with pin „REM-SB" and in digital remote control by the corre-
sponding command. If the error is still present, the output is
not switched on.
OV 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: 06-27-2011
7.5 Overtemperature occurs
As soon as an overtemperature (OT) error occurs by internal
overheating, the output is switched off and the status text „OT"
is displayed in the middle status field of the display.
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. The output voltage
only will only be zero if all internal power stages have shut down
because of overheat.
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 acknowledge the error and flush the buffer.
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 „OV".
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".
All models feature an adjustable power limitation for 0...P
It becomes active and 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 limitation 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. Once
the current set value is 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).
Those three conditions CC, CV and CP are indicated on the
appropriate pins of the analogue interface cards or can be read
out as status bits via an optional, digital interface card.
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
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Instruction Manual
PS 8000 3U Series
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