Operating instructions

Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
219
7.9 Application-specific functions
The inverter offers a series of functions that you can use depending on your particular
application, e.g.:
● Unit changeover
● Braking functions
● Automatic restart and flying restart
● Basic process control functions
● Logical and arithmetic functions using function blocks that can be freely interconnected
Please refer to the following sections for detailed descriptions.
● Essential service mode
● Multi-zone controller
● Cascade control
● Bypass
● Energy-saving mode
7.9.1 Unit changeover
Description
With the unit changeover function, you can adapt the inverter to the line supply (50/60 Hz)
and also select US units or SI units as base units.
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 220) IEC/NEMA (adaptation to the line su
pply)
● Changing over the unit system (Page 221)
● Changing over process variables for the technology controller (Page
222)
NOTICE
The motor standard, the unit system as well as the process variables can only be
changed offline.
The procedure is described in Section Changing of the units with STARTER (Page 223).