NORD Drivesystems BU0220 - Manual (Page 63)

7 PROFIBUS DP data transfer
BU 0220 GB-0912 Subject to technical amendments 63
7.2.1.3 Setpoint 1 (SW1)
The function of the first setpoint is set in the parameter "Function bus setpoint 1" (SK 200E: (P546[01]) or
SK 500E: (P546)) (see relevant frequency inverter manual).
In the order telegram, setpoint 1 follows immediately after the control word. Setpoint 1 is pre-set to the transfer
of a setpoint frequency (16 bit value).
PZD1 PZD2 PZD3 PZD4
STW SW1 SW2 SW3
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
The setpoint is transferred as an integer in the range -32768 to 32767 (8000 hex to 7FFF hex), whereby 16384
(4000 hex) is exactly 100% and -16383 (C000 hex) corresponds to -100%. Due to this resolution, setpoints
(depending on function) of up to ± 200% can be transferred.
A setpoint of 100% corresponds to the respective nominal value:
Setting 100% is equal to
Off
Setpoint frequency, actual frequency PID, actual
frequency PID limited, actual frequency PID monitored,
frequency addition, frequency subtraction, maximum
frequency Maximum frequency
Torque current limit Torque current limit (P112)
Current limit Inverter rated current
Servo mode torque Rated torque
Torque precontrol Torque precontrol (P214)
7.2.1.4 Setpoints 2 and 3 (SW2/3)
If the PPO type 2 or 4 is used, in addition to setpoint 1, a second setpoint can be transferred in word PZD3 and
a third setpoint in PZD4.
PZD1 PZD2 PZD3 PZD4
STW SW1 SW2 SW3
The definition of these two setpoints corresponds to that of setpoint 1.
However, the transfer of a third (maximum 16 Bit) setpoint is only possible if the other two setpoints are also 16
Bit values.
If the transfer of a 32 bit setpoint is necessary (Example: setpoint position), this must be divided into two 16 bit
values, i.e. into two PZDs (position High and Low word). It does not matter in which of the three process
data words (PZD2 and above) the two position words are transferred.
The definition in the frequency inverter can then, for example, be made via the parameters:
PZD3: „Bus function - setpoint 2" (SK 200E / SK 54xE: (P546[-02]) or SK 500E (P547)) and
PZD4: „Bus function - setpoint 3" (SK 200E / SK 54xE: (P546[-03]) or SK 500E (P548))