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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSI 9000 DT Series
3.5.4
Remote control via the analog interface (AI)
3.5.4.1
General
The built-in and galvanically isolated 15-pole analog interface (short: AI) on the rear side of the device offers the
following possibilities:
•
Remote control of current, voltage, power and internal resistance
•
Remote status monitoring (CV, DC status)
•
Remote alarm monitoring (OT, OVP, OCP, OPP, PF)
•
Remote monitoring of actual values
•
Remote on/off switching of the DC output
Setting the
three
set values of voltage, current and power via the analog interface always takes place concur-
rently. It means, that for example the voltage can’t be given via the AI and current and power would be set with
the rotary knobs, or vice versa. The internal resistance set value can additionally be adjusted, if resistance mode
is activated via pin R-ACTIVE.
The OVP set value and other supervision (events) and alarm thresholds can’t be set via the AI and therefore must
be adapted to the given situation before the AI is taking over. Analog set values can be fed in by an external volt-
age or by the reference voltage on pin 3. As soon as remote control via the analog interface is activated, the set
values on the display will be those provided by the interface.
The AI can be operated in the common voltage ranges 0...5 V and 0...10 V. The selection of the voltage range is
done in the device setup. See section
„3.4.3. Configuration via MENU“
for details.
The reference voltage sent out from Pin 3 (VREF) will be adapted accordingly and is then:
0-5 V
: Reference voltage = 5 V, 0...5 V set values (VSEL, CSEL, PSEL, RSEL) correspond to 0...100% nominal
values, 0...100% actual values correspond to 0...5 V at the actual value outputs (CMON, VMON).
0-10 V
: .Reference voltage = 10 V, 0...10 V set values (VSEL, CSEL, PSEL RSEL) correspond to 0...100% nominal
values, 0...100% actual values correspond to 0...10 V at the actual value outputs (CMON, VMON).
Input of excess set values (e. g. >5 V in selected 5 V range or >10 V in the 10 V range) are clipped by setting the
set value at 100%.
Before you begin, please read. Important notes for use of the interface:
After powering the device and during the start phase the AI signals undefined statuses on the
digital output pins such as ALARMS 1. Those must be ignored until it’s ready to work.
•
Analog remote control of the device must be activated by switching pin REMOTE (5) first. Only exception is pin
REM-SB, which can be used independently
•
Before the hardware is connected that will control the analog interface, it shall be checked that it can’t provide
voltage to the pins higher than specified
•
Set value inputs, such as VSEL, CSEL, PSEL and RSEL (if R mode is activated), must not be left unconnected
(i.e. floating)
•
It’s always required to provide all three set values at once. In case any of the set values isn’t used for adjustment,
it can be tied to a defined level or connected to pin VREF (solder bridge or different), so it gives 100%
3.5.4.2
Resolution and sample rate
The analog interface is internally sampled and processed by a digital microcontroller. This causes a limited resolu-
tion of analog steps. The resolution is the same for set values (VSEL etc.) and actual values (VMON/CMON) and
is approx. 26214. Due to tolerances, the truly achievable resolution can be slightly lower.
There is furthermore a max. sample rate of 500 Hz for inputs. It means, the device can acquire analog set values
and statuses on digital pins 500 times per second.
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