Siemens SIMATIC ET 200pro - Device functions; 10.1 Introduction

Setting functions
8.7 Application-specific functions
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
141
● Flying restart (ON command with rotating motor)
Details can be found in the List Manual from parameter p1200, see also: Manuals for
your inverter (Page 248).
● PID technology controller
Details can be found in the List Manual from function block diagram 7950, see also:
Manuals for your inverter (Page 248).
8.7.2
Unit changeover
Description
Using the unit switchover function, you can switch over parameters and process variables for
input and output to an appropriate system of units: US units, SI units or relative variables as
a %.
Independent of this, you can define the units for process variables or change over to
percentage values.
Specifically, you have the following options:
● Changing over the motor standard (Page 142) IEC/NEMA
● Changing over the unit system (Page 142)
● Changing over process variables for the technology controller (Page 143)
The motor standard, the unit system as well as the process variables can only be changed
offline.
Restrictions for the unit changeover function
● The values on the rating plate of the inverter or motor cannot be displayed as percentage
values.
● Using the unit changeover function several times (for example, percent → physical unit 1
→ physical unit 2 → percent) may lead to the original value being changed by one decimal
place as a result of rounding errors.
● If the unit is changed over into percent and the reference value is then changed, the
percentage values relate to the new reference value.
Example:
– For a reference speed of 1500 rpm, a fixed speed of 80% corresponds to a speed of
1200 rpm.
– If the reference speed is changed to 3000 rpm, then the value of 80% is kept and now
means 2400 rpm.
See also
Switching units with STARTER (Page 143)