Page 57
EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
www.eps-germany.de
PSI 9000 2U Series
3.5.3.2
General
With the standard models of series PSI 9000 2U, one of the plug-in and retrofittable modules listed in
be installed. It can take over remote control of the device alternatively to the built-in USB port on the back side or
analog interface. For installation see section
„2.3.8. Installation of an interface module“
The modules require little or no settings for operation and can be directly used with their default configuration. All
specific settings will be permanently stored such that, after changeover between the various models, no recon
-
figuration will be necessary.
3.5.3.3
Programming
Programming details for the interfaces, the communication protocols etc. are to be found in the documentation
“Programming Guide ModBus & SCPI“ which is supplied on the included USB stick or which is available as down-
load from the manufacturer’s website.
3.5.4
Remote control via the analog interface (AI)
3.5.4.1
General
The built-in, galvanically isolated 15-pole analog interface (short: AI) is on the rear side of the device offers the
following possibilities:
•
Remote control of current, voltage, power and internal resistance *
•
Remote status monitoring (CC/CP, CV)
•
Remote alarm monitoring (OT, OVP, PF)
•
Remote monitoring of actual values
•
Remote on/off switching of the DC output
Setting the set values of voltage, current and power via the analog interface must always be done concurrently.
It means, that for example the voltage can’t be given via the AI and current and power set by the rotary knobs, or
vice versa. The internal resistance set value can additionally be adjusted.
The OVP set value and other supervision (events) and alarm thresholds cannot be set via the AI and therefore
must be adapted to the given situation before the AI is going to be in control. Analog set values can be supplied
by an external voltage or generated from the reference voltage on pin 3. As soon as remote control via the analog
interface is activated, the displayed set values will be those provided by the interface.
The AI can be operated in the common voltage ranges 0...5 V and 0...10 V, both representing 0...100% of the
nominal value. The selection of the voltage range can be done in the device setup. See section
for details. The reference voltage sent out from pin 3 (VREF) will be adapted accordingly:
0-5 V
: Reference voltage = 5 V, 0...5 V set value signal for VSEL, CSEL, PSEL and RSEL correspond to 0...100%
nominal value, 0...100% actual values correspond to 0...5 V at the actual value outputs CMON and VMON.
0-10 V
: Reference voltage = 10 V, 0...10 V set value signal for VSEL, CSEL, PSEL and RSEL correspond to 0...100%
nominal values, 0...100% actual values correspond to 0...10 V at the actual value outputs CMON and VMON.
Input of excess signals (e.g. >5 V in selected 5 V range or >10 V in the 10 V range) are clipped by the device by
setting the corresponding set value to 100%.
Before you begin, please read these important notes about the use of the interface:
After powering the device and during the start phase the AI signals undefined statuses on the
output pins such as ERROR or OVP. Those must be ignored until is 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 since KE firmware version 2.07
•
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) during analog remote control. In case any of the set values is not used for adjustment, it can be tied
to a defined level or connected to pin VREF (solder bridge or different), so it gives 100%
The analog interface is galvanically separated from DC output. Therefore avoid to connect any
ground of the analog interface to the DC- or DC+ output!
* Unless the device has not already been delivered with KE firmware version 2.10 or higher, the internal resistance mode requires a hardware modification in the factory
