Operating instructions

Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
220 Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
Note
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 a multiple 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.
Reference variables for unit changeover
p2000 Reference frequency/speed
p2001 Reference voltage
p2002 Reference current
p2003 Reference torque
r2004 Reference power
p2005 Reference angle
p2007 Reference acceleration
7.9.1.1 Changing over the motor standard
You change over the motor standard using p0100. The following applies:
● p0100 = 0: IEC motor (50 Hz, SI units)
● p0100 = 1: NEMA motor (60 Hz, US units)
● p0100 = 2: NEMA motor (60 Hz, SI units)