heinzinger ERS Compact Series, Руководство пользователя, Страница: 73 / 114

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Page 73
ERS COMPACT
Pin Name Type* Description Default levels
Electrical specifications
14
ALARMS 2
DO
Overvoltage alarm
Overcurrent alarm
Overpower alarm
Alarm = HIGH, U
High
> 4 V
No alarm = LOW, U
Low
<1 V
Quasi open collector with pull-up against Vcc **
With 5 V on the pin max. flow +1 mA
I
Max
= -10 mA at U
CE
= 0,3 V, U
Max
= 30 V
Short-circuit-proof against DGND
15 STATUS*** DO
Constant voltage
regulation active
CV = LOW, U
Low
<1 V
CC/CP/CR = HIGH, U
High
>4 V
DC terminal
Off = LOW, U
Low
<1 V
On = HIGH, U
High
>4 V
* 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
****** Default setting, can be configured, see section
3.5.3
3.6.4.6
Simplified 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 kΩ) for an operation amplifier
circuit.
4K
7
12V +10V
Digital Output (DO)
A quasi open collector, realized as high
resistance pull-up against the internal
supply. In condition LOW it can’t drive any
load, only sink small current, as shown in
the diagram with a relay as example.
V~2
AGND
Analog Output (AO)
Output from an operation amplifier
circuit, low impedance. See specifi
-
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 sufficiently low resistance. Check the specification of the
controlling application. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC terminal of the device on and off. 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 off, 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).
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 terminal, according
to the level definitions in
3.6.4.5 . The logical function and the default levels can be inverted by a parameter in the
setup menu of the device. See 3.5.3.1 .
If the pin is unconnected or the connected contact is open, the pin will be HIGH. With setting
“Analog interface” -> “REM-SB level” being set to “Normal”, it requests to switch the DC terminal
on. So when activating remote control, the DC terminal will instantly switch on.