4-213
When 11-40=2: OV prevention Mode 2
The process of OV prevention mode 2 is the same as that of OV prevention mode 1 but it strengthens
more the part of DC BUS over the deceleration stop voltage of OV prevention (11-39) in Fig.4.4.80.c. It can
accelerate frequency compensation to avoid OV protection by increasing frequency gain of OV prevention
2 (11-28).
11- 64
Acceleration Speed Gain Adjustment
Range
【
0.1~10.0】
11- 65
Target Main Circuit Voltage
Range
200V :【
200~400】V
400V :【
400~800】V
When 11-40 =3 (OV Prevention Mode 3), user can temporarily increase output frequency to avoid OV
occurring and it will be not higher than the maximum output frequency of motor 1. Thus, adjust parameter
01-02 (maximum output frequency of motor 1) depending on the application.
Adjustment modes
If OV still occurs in OV prevention mode 3, increase the setting value of parameter 11-64 in 0.1 units.
When the setting value of parameter 11-64 is higher, the speed and the current increase more.
11- 41
Reference Frequency Loss Detection
Range
【
0】 : Deceleration to Stop when Reference Frequency Disappears
【1】 : Operation is Set by 11-42 when Reference Frequency Disappears
11- 42
Reference Frequency Loss Level
Range
【
0.0~100.0】%
A reference frequency loss is detected when the frequency command falls 90% within 360ms.
When 11-41=1, main frequency command continuously compares with the previous value occurring in 360
ms.
When the frequency loss occurs, inverter will operate depending on the following estimated frequency
command.
Frequency command after frequency loss = the maximum output frequency of motor 1 (01-02) × the level
set in parameter 11-42
Descriptions of frequency loss function:
1) When inverter is on operation and source of selected analog command disappears, the command acts
depending on the setting of parameter 11-42.
2) When reference command restores to the level prior to frequency loss, inverter will restore to the
previous state.
Notes:
1. Frequency command (11-42) is corresponding to the maximum output frequency of motor 1 (01-02)
when reference frequency disappears.
2. The disappearance of reference frequency is only for the use of analog signal (1: AI1; 7:AI2) from the
selection of main frequency source (00-05).
Refer to Fig.4.4.81 for the process diagram of multi-function digital output (03-11~03-12) when reference
frequency loss occurs.
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