11.3.3 Reference value/actual value
In PZD2, the master sends its reference value to the frequency inverter in its output
data set and receives information about the actual value in its input data set.
The use of the reference/actual value channel depends on the set configuration (con-
trol method). The actual value is generated according to the control method used.
The reference value and actual value refer to parameter Rated frequency 375 OR
Profibus/PROFINET Reference 390.
The distinction is made based on the setting of parameter Profibus/PROFINET refer-
ence 390. If Profibus/PROFINET reference 390
= 0, the values are obtained from
Rated frequency 375. If Profibus/PROFINET reference 390 ≠ 0, Prof
i-
bus/PROFINET reference 390 is used. Both parameters are data set switchable.
Profibus/PROFINET reference
The reference and actual value are transmitted in standardized form. Standardization
is effected through the variable used as the reference variable (Rated frequency 375
OR
Profibus/PROFINET reference
390).
Value range = ±200 % = +32768 through -32768 = 0x7FFF through 0x8000
In Parameter Profibus/PROFINET reference 390, the rated frequency of
60.00 Hz is set. The required reference frequency is 30.00
50 % of the reference value, 8192 (0x2000) must be transmitted as the
With the reference variable Profibus/PROFINET reference 390, a machine can be
operated in the field weakening range above its reference frequency.
Parameter Rated frequency 375 is set to 50.00 Hz. With the setting of
parameter Profibus/PROFINET reference 390 to 100.00 Hz, the value
range ±200 Hz is possible.
The reference value for the frequency inverter from PZD2 is supplied via the reference
line value. This reference value is combined in the input of the ramp function with the
internal reference frequency from the reference frequency channel. For information
on the reference frequency channel, refer to the frequency inverter Operating Instruc-
74 CM-PROFINET 10/13
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