User Manual

Page 54
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
* AI = Analog Input, AO = Analog Output, DI = Digital Input, DO = Digital Output, POT = Potential
** Internal Vcc approx. 10 V
*** Only one of both signals possible, see section 3.5.3.1
**** Only during remote control
***** The error of a set value input adds to the general error of the related value on the DC terminal of the device
3.6.4.5 Overview of the Sub-D socket
3.6.4.6 Simplied diagram of the pins
++
Digital Input (DI)
It requires to use a switch with low resis-
tance (relay, switch, circuit breaker etc.) in
order to send a clean signal to the DGND.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance
>40k....100kΩ)foranoperational
ampliercircuit.
4K7
12 V
+10V
Digital Output (DO)
A quasi open collector, realized as high
resistance pull-up against the internal sup-
ply. In condition LOW it can carry no load,
merely switch, as shown in the diagram
with a relay as example.
V~2
AGND
Analog Output (AO)
Outputfromanoperationalamplier
circuit,lowimpedance.Seespeci-
cations table above.
3.6.4.7 Application examples
a) Switching the DC terminal with pin REM-SB
A digital output, e. g. from a PLC, may be unable to cleanly pull down the pin as
it may not be of low enough resistance. Check the specication of the controlling
application. Also see pin diagrams above.
Inremotecontrol,pinREM-SBisusedtoswitchtheDCterminalofthedeviceonando󰀨.Thisfunction
is also available without remote control being active and can on the one hand block the DC terminal
from being switched on in manual or digital remote control and on the other hand the pin can switch
theDCterminalonoro󰀨,butnotstandalone.Seebelowat“Remotecontrolhasnotbeenactivated”.
It’s recommended that a low resistance contact such as a switch, relay or transistor is used to switch
the pin to ground (DGND).