3 ControlBoxes – SK SSX-3A
BU 0040 GB-1611 Subject to technical alterations 49
3.1.3.3 Operating mode IO-S (Setpoint mode via DI1 of the frequency inverter)
In the operating mode IO-S, communication is via digital input "1" of the frequency inverter. The frequency inverter
does not return any operating or parameter values to the box.
Field of use
In this operating mode the box can communicate with SK 2xxE series frequency inverters.
Functions
In this operating mode the functions
• Control
• Setpoint display
are available. The setpoint display is scaleable, the setpoint value is continuously transferred to the frequency
inverter.
Connections
Connection to the horizontal terminal bar is by means of a
3-wire cable.
Settings on the frequency inverter
Name Parameter number Value Notes
Function, setpoint input P400 [-05] {01}* Corresponds to default value
Function of digital input 1 P420 [-01] {29}**
The function {29} "Enable Setpoint Box" must be
previously set with the aid of a parameterisation
tool or in the IO-C mode.
* The function can be re-parameterised as required (e.g. as an auxiliary setpoint ("Frequency addition")). For this, the SK SSX-3A must temporarily be set to IO-C mode, or a different
parameterisation tool (e.g. NORD CON, ParameterBox etc.) must be used.
** The control commands from the Simple Setpoint Box (Enable/Stop) are only processed by the frequency inverter with this setting.
NOTE
In "IO-S" mode the parameterised functions of Digital Input 1 (parameter (P420[-01])) are
deactivated.
The DIP switch S1: 3 … 5 of the frequency inverter ("BUS" / "IO") must be left in the factory
setting ("OFF" or"0") in order to prevent communication faults on the frequency inverter.
44 24V
DC
40 GND
B1 Signal OUT
C1 Signal IN
24V
GND/0V
44 40 B1 C1
Connection of the 24V power
supply from the SK 2xxE
I/O connection for FI setpoint values
OUT
Connection for IO-S mode
SK SSX-3A
SK 2xxE-
44 40 21 1
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