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Elmark Automatyka S.A.
ul. Niemcewicza 76, 05-075 Warszawa, tel. (+48) 22 773 79 37; [email protected]; www.elmark.com.pl
NIP: 5252072585; KRS: 0000803828, Sąd Rejonowy dla M-St. Warszawy, XIV Wydział Gosp. KRS; Kapitał Zakładowy 525.000 zł, w pełni opłacony
It is applicable to special load such as dehydrator and centrifuge.
Any such V/F curve can be obtained by setting parameters of P4.03 to P4.08.
2: Square V/F
It is applicable to centrifugal loads such as fan and pump. 3 to 8: V/F curve between linear V/F and square V/F
10: V/F complete separation mode
In this mode, the output frequency and output voltage of the AC drive are independent. The output frequency is determined by
the frequency source, and the output voltage is determined by "Voltage source for V/F separation" (P4.13).
It is applicable to induction heating, inverse power supply and torque motor control.
11:V/F half separation mode
In this mode, V and F are proportional and the proportional relationship can be set in P4.13. The relationship between V and F is
also related to the rated motor voltage and rated motor frequency in Group P2.
Assume that the voltage source input is X (0 to 100%), the relationship between V and F is: V/F= 2 * X * (Rated motor voltage)/
(Rated motor frequency)
P4.01
Torque boost
Default
Model dependent
Setting Range
0.0%-30%
P4.02
Cut-off frequency of
torque boost
Default
50.00Hz
Setting Range
0.00Hz~maximum output frequency
To compensate the low frequency torque characteristics of V/ F control, you can boost the output voltage of the AC drive at
low frequency by modifying P4.01. If the torque boost is set to too large, the motor may overheat, and the AC drive may suffer
over current. If the load is large and the motor startup torque is insufficient, increase the value of P4.01. If the load is small,
decrease the value of P4.01. If it is set to 0.0, the AC drive performs automatic torque boost. In this case, the AC drive automatically
calculates the torque boost value based on motor parameters including the stator resistance.
P4.02 specifies the frequency under which torque boost is valid. Torque boost becomes invalid when this frequency is exceeded,
as shown in the following figure.
Figure 4-5 Manual torque boost
f1: Cutoff frequency of manual torque boost fb: Rated running frequency
P4.03
Multi-point V/F
frequency 1 (F1)
Default
0.00Hz
Setting Range
0.00Hz~P4.05
P4.04
Multi-point V/F voltage 1 (V1)
Default
0.0%
Setting Range
0.0%~100.0%
P4.05
Multi-point V/F frequency 2 (F2)
Default
0.00Hz
Setting Range
P4.03~P4.07
P4.06
Multi-point V/F voltage 2 (V2)
Default
0
Setting Range
0.0%~100.0%
Summary of Contents for elmatic ED2000
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