NORD USS and Modbus RTU Manual
36 Subject to technical amendments BU 0050 GB-3111
1.5.3.7 Actual value 1 (IW1)
The actual value 1, i.e. the actual output frequency of the inverter, is transferred as a 16 Bit value as
standard in the actual value 1. The actual value 1 is transferred to the master in the inverter response
telegram as the second word in the process data area.
The actual value 1 is transferred as a whole number in the range (-32768 to 32767). In addition to the actual
frequency, other actual inverter values can be transferred. The setting is made in P543 'Actual value 1
function'.
The settings „Actual frequency‟, „Actual speed‟, „Current‟ and „Torque current‟ are transferred as percentages
of the respective nominal values. The value 16384 (4000 HEX) corresponds to 100%. The value C000 HEX
corresponds to -100%. Actual values in the range –200% to +200% can be transferred.
With the setting „Digital I/O status‟, the states of the control terminals and the relay (MFR) /digital outputs can
be transferred:
Bits 6-11 for POSICON special extension unit
Bit 6 for encoder special extension unit
Multifunctional relay 1-4
Relay and digital outputs 1 - 4
With the setting 'Actual position' and 'Setpoint position' the actual absolute position is transferred. The
resolution is 1 = 0.001 revolutions.
If with SK 700E/750E the value 'Setpoint position 32 Bit' is set in parameter P546 (Setpoint function 1), then
the actual value (setpoint or actual position) is also transferred as a 32 Bit value in PZD2 and PZD3:
1.5.3.8 Actual value 2 and actual value 3 (IW2/3)
It is possible to forward two more actual values to the controller if PPO type 2 or 4 is used for transfer.
The assignment of the actual values 2 and 3 to the process data words PZD3 and PZD4 is carried out in the
same way as the assignment of setpoints 2 and 3. These also differ in sequence between the SK 500E and
other inverter series.
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