NORD USS and Modbus RTU Manual
50
Subject to technical amendments
BU 0050 GB-3111
1.8 Frequency Inverter Settings
1.8.1
Frequency inverter bus parameters
To operate the inverter with the USS protocol, the bus must be connected to the master and some settings
must be made on the frequency inverter.
The frequency inverter can always be parameterised. Control of the inverter via USS can be activated by
setting parameter
P509
to value 2, 3 or 4 (
for SK 500E to 2
) (see below). In order to access the inverter via
the control unit, only the baud rate in
P511
and the inverter address
P512
need to be set.
The telegram down time
P513
can be selected depending on the USS system.
1.8.1.1
Control clamp parameters
Parameter
Setting value / Description / Note
Comments
P480 ..[-01]
...
.. [-12]
Function BusIO In Bits
(Function of Bus I/O In Bits)
0 ... 72
{ 0 }
The Bus I/O In Bits are perceived as digital inputs. They can be set to the same functions as the digital
inputs (See P420…of the respective FI manual).
[-01]=
Bus I/O In Bit 0
[-02]=
Bus I/O In Bit 1
[-03]=
Bus I/O In Bit 2
[-04]=
Bus I/O In Bit 3
[-05]=
Bus I/O In Bit 4
[-06]=
Bus I/O In Bit 5
[-07]=
Bus I/O In Bit 6
[-08]=
Bus I/O In Bit 7
[-09]=
Flag 1 (only SK 500E)
[-10]=
Flag 2 (only SK 500E)
[-11]=
Bit 8 BUS control word (only for SK 500E)
[-12]=
Bit 9 BUS control word (only for SK 500E)
P481 .. [-01]
...
.. [-10]
Function BusIO Out Bits
(Function of Bus I/O Out Bits)
0 ... 39
{ 0 }
The bus I/O Out bits are perceived as multi-function relay outputs. They can be set to the same functions
as the digital inputs (See P434…of the respective FI manual).
[-01]=
Bus I/O Out Bit 0
[-02]=
Bus I/O Out Bit 1
[-03]=
Bus I/O Out Bit 2
[-04]=
Bus I/O Out Bit 3
[-05]=
Bus I/O Out Bit 4
[-06]=
Bus I/O Out Bit 5
[-07]=
Bus I/O Out Bit 6 / Flag 1
[-08]=
Bus I/O Out Bit 7 / Flag 2
[-09]=
Bit 10 BUS status word (only for SK 500E)
[-10]=
Bit 13 BUS status word (only for SK 500E)
P482 .. [-01]
...
.. [-10]
Stand. BusIO Out Bits
(Standardisation of Bus I/O Out Bits)
-
400 … 400 %
{ 100 }
Adjustment of the limit values of the relay functions/Bus Out Bits. For a negative value, the output
function will be output negative.
When the limit value is reached and the setting values are positive, the relay contact closes, with
negative setting values the relay contact opens.
P483 .. [-01]
...
.. [-10]
Hyst. BusIO Out Bits
(Hysteresis of Bus I/O Out Bits)
1 … 100 %
{ 10 }
Difference between switch-on and switch-off point to prevent oscillation of the output signal.
