Nord Drivesystems SK PAR-2H - SK SSX-3 A Operating Mode 485 C

NORDAC Control and Parameter Boxes
44 Subject to technical alterations BU 0040 GB-1611
3.1.3.1 Operating mode 485C (Control mode via RS485)
With the 485C operating mode, communication with the connected frequency inverter is carried out via the RS485
interfaces of the Simple Setpoint Box. Here, all the features provided by the SimpleBox SK CSX-3H/ -3E (Section
2.2) are also available.
Field of use
In this operating mode, the box can communicate with the series SK 2xxE, SK 300E, SK 5xxE, SK 700E and SK
750E. The prerequisite for this is that the relevant frequency inverters are equipped with a suitable interface
(RS485) (on the terminal bar or RJ 12 socket.
Functions
In this operating mode the functions
• Parameterisation
• Control
• Display of operating values
are available without restriction and correspond to those of the SimpleBox SK CSX-3H/ -3E.
Connections
Connection to the vertical terminal bar is by means of a 4-
wire cable.
An integrated 270Ω termination resistor is provided for
RS485 communication.
Settings on the frequency inverter
Name Parameter number Value Notes
Control word source P509 0 Corresponds to default value
Setpoint source(s) P510 0 Corresponds to default value
USS Baud rate P511 3 (38400 Baud)* Corresponds to default value
USS address P512 0 Corresponds to default value
* Lower baud rates can also be set, however the SK SSX-3A (temporarily) configures the frequency inverter to the setting {3} = 38400Baud, if this was parameterised to the value
<19200Baud. After the mains are switched off at the frequency inverter, the original setting is once again active.
44 24V
DC
40 GND
73 RS485 A(+)
74 RS485 B(-)
Terminal bar
a
)
24V
GND/0V
44 40 73 74
Connection of 24V voltage
supply from FI
b)
RS485 data cable to
fre
q
uenc
y
inverte
r
RS485 B (-)
RS485 A (+)
SK SSX-3A
Frequency inverter SK xxxE
44 40 73 74
RS48 5_A RS48 5_B GND TXD RXD +5V
+ 24V
RJ12 socket
a
)
, c
)
Connection for 485-C mode
a) If available on the frequency inverter
b) 24V
DC
– Supply by separate mains unit is also possible
c) Observe correct voltage (24V
DC
), if necessary, provide the supply voltage to the SK SSX3A separately.