Remote Control Via The Analog Interface (Ai) - Elektro-Automatik EL 9080-170 B Betriebsanleitung

3.5.3.2 General information about the interface modules
With the standard models of series EL 9000 B, one of the plug-in and retrofittable modules listed in 3.5.3.1 can be
installed. It can take over remote control of the device alternatively to the built-in USB type B on the rear side or the
analog interface. For installation see section „2.3.10. Installation of an interface module" and separate documentation.
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 re-
configuration 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 EA Elektro-Automatik 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 resistance
• Remote status monitoring (CV, DC input)
• Remote alarm monitoring (OT, OVP, OCP, OPP, PF)
• Remote monitoring of actual values
• Remote on/off switching of the DC input
Setting the three set values for voltage, current and power via the analog interface must always be done concur-
rently. It means, that for example the voltage can not be given via the AI and current and power set by the rotary
knobs, or vice versa. Resistance mode is additionally possible and requires to set the corresponding pin.
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 will 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 in each case 0...100% of the nominal
value. The selection of the voltage range can be 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:
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 OT 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
• 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 isolated from the DC input. Therefore do not connect any
ground of the analog interface to the DC- or DC+ input, if not absolutely necessary!
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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