Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9750-66 3U Electronic Load 0 - 66 A 0 - 750 Vdc 0 - 10500 W 33200413 Ficha De Dados
Códigos do produto
33200413
Page 52
ELR 9000 Series
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
3.5.4.5 Simplified diagram of the pins
+
Digital Input (DI)
It requires to use a switch with low resist-
It requires to use a switch with low resist-
ance (relay, switch, circuit breaker etc.) in
order to send a clean signal to the DGND.
A digital output from a circuit or PLC may
A digital output from a circuit or PLC may
not be sufficient if not an “open collector”.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance
High resistance input (impedance
>40 k....100 kΩ) for an OA circuit.
4.
7k
12V
+10V
Digital Output (DO)
A quasi open collector, realised as high
A quasi open collector, realised 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 OA circuit, only mini-
Output from an OA circuit, only mini-
mally impedant. See specifications
table above.
3.5.4.6 Application examples
a) Switching off the DC input via the pin “REM-SB”
A digital output, e.g. from a PLC, may be unable to cleanly effect this as it may
not be of low enough resistance. Check the specification of the controlling ap-
plication. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC input of the device on and off. This is
also available without remote control being active.
It is recommended that a low resistance contact such as a switch, relay or transistor is used to
It is recommended that a low resistance contact such as a switch, relay or transistor is used to
switch the pin to ground (DGND).
Following situations can occur:
• Remote control has been activated
During remote control via analog interface, only pin “REM-SB” determines the states of the DC input, according to
Following situations can occur:
• Remote control has been activated
During remote control via analog interface, only pin “REM-SB” determines the states of the DC input, according to
the levels definitions in 3.5.4.3. The logical function and the default levels can be inverted by a parameter in the
If the pin is unconnected or the connected contact is open, the pin will be HIGH. With parameter
“Analog interface REM-SB” being set to “normal”, it requests “DC input on”. So when activating
remote control, the DC input would instantly switch on.
• Remote control is not active
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC input from being switched on by any
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC input from being switched on by any
means. This results in following possible situations:
DC-
input
+
Pin
„REM-SB“
+
Parameter
„REM-SB“
Behaviour
is off
+
HIGH
+
normal
DC input not locked. It can be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted
DC input locked. It can not be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface. When trying to
switch on, a popup in the display resp. an error message will be
generated.
LOW
+
normal