Danfoss iC2 Application Manual page 252

Application Guide | iC2-Micro Frequency Converters
Parameter
617
Number
Data type:
uint16
P 9.5.2.10 T33 Current Dead Zone Scale
A non-zero value for the parameter enables the dead-zone function. The dead-zone band defines an area which could freeze the pointed
speed reference by scaled analog input signal, or ignore unexpected vibration at desired speed caused by disturbance of reference
signal. The bandwidth of dead zone is the double value of P 9.5.2.10 T33 Current Dead Zone Scale.
Default value:
0
Parameter
618
Number
Data type:
uint16
Dead-zone function
A non-zero value for the parameter Voltage/Current Dead Zone Scale enables the dead-zone function. The dead-zone band defines
l
an area which could freeze the pointed speed reference by scaled analog input signal, or ignore unexpected vibration at desired
speed caused by disturbance of reference signal.
The bandwidth of dead zone is the double value of Voltage/Current Dead Zone Scale.
l
Dead-zone band central point is the mid-value of High and Low value of the voltage or current.
l
When Low Ref./feedb. Value is a negative value, and the parameter of AI minimum valueLow Voltage/Current set as 0, if the analog
l
input signal is lost (AI input value = 0), the motor runs at the value of Low Ref./feedb. Value without expectation. This would cause
uncertainty risk or danger. Therefore, the parameters of AI Low Voltage/Current should be set as a non-zero value, like 2 V or 4 mA.
The following illustration is an example of using T33 analog input (voltage mode, from 2 V to 10 V) for dead-zone function to control
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motor running between the speed from -50 Hz to 50 Hz.
P 9.5.2.9 T33 high ref. /feedb. value
(example value: 50 Hz)
P 9.5.2.3 T33 low voltage
(example value: 2 V)
0 Hz
0 V
P 9.5.2.7 T33 low ref./feedb. value
(example value: -50 Hz)
Figure 86: Dead-zone Function Example
The typcial parameter settings for the examples are shown in the following tables.
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Dead zone central point
(example value: 6 V)
Dead zone band
(example value: 2 V)
Forward
Reverse
P 9.5.2.2 T33 high voltage
P 9.5.2.9 Voltage dead zone scale
(example value: 0.5 V)
Unit:
Access type:
Parameter type:
Unit:
Access type:
AI
(example value: 10 V)
V
Read/Write
Range (0–1000)
mA
Read/Write
AB413939445838en-000301 / 130R1254