Honeywell HVAC232 Series, Applications Manual

Page: 97 / 145

Application manual HVAC232/402 | Document 27-652 | Issue ENG06 | 2019-08-07 97
2 = Programmable U/f curve:
The U/f curve can be programmed with three different points. Programmable U/f
curve can be used if the other settings do not satisfy the needs of the application.
U [ V ]
f [ H z]
Par. 1.11
Par. 1.13
Par. 1.14
Un
Par.1.12 Par. 1.10
Default:
Nominal voltage
of the motor
Field weakening point
Default:
Nominal frequency
of the motor
2 linear
areas
Fig. 44. Programmable U/f curve
Field weakening point
The field weakening point is the output frequency at which the output volt-
age reaches the value set with par.1.11.
Field weakening point voltage
Above the frequency at the field weakening point, the output voltage re-
mains at the value set with this parameter. Below the frequency at the field
weakening point, the output voltage depends on the setting of the U / f
curve parameters. See „10 Parameter description“ on page 96 and „Fig.
43. Linear and squared change of motor voltage“ on page 96 and 125
and „Fig. 44. Programmable U/f curve“ on page 97.
When the parameters 1.1 and 1.2 (nominal voltage and nominal frequency
of the motor) are set, the parameters 1.10 and 1.11 are automatically given
the corresponding values. If you need different values for the field weaken-
ing point and the voltage, change these parameters after setting the param-
eters 1.1 and 1.2.
U/f middle point frequency
If the programmable U/f curve has been selected with the parameter 1.9,
this parameter defines the middle point frequency of the curve. See „Fig.
44. Programmable U/f curve“ on page 97.
U/f middle point voltage
If the programmable U/f curve has been selected with the parameter 1.9,
this parameter defines the middle point voltage of the curve. See „Fig. 44.
Programmable U/f curve“ on page 97.
Zero frequency voltage
This parameter defines the zero frequency voltage of the curve see
„Fig. 43. Linear and squared change of motor voltage“ on page 96 on
page 96 and „Fig. 44. Programmable U/f curve“ on page 97.