Amtech Axpert-Eazy Series - Page 117

Axpert-Eazy AC Variable Frequency Drive
6-71
6
B603: ASR Dead Band (%)
This represents non-sensitive range of ASR’s input. If the speed error is less than this value than it will
be considered as zero error. This is in percentage of maximum frequency.
Error
Final Error
Dead Band
B604: Speed LPF Time Constant 1 & B622: Speed LPF Time Constant 2 (mS)
It is time constant of low pass filter for speed feedback to the ASR. These parameters are applicable
for sensor less vector control only.
100 %
63 %
Filter's input
Filter's output
Time Constant
t
B605: ASR Kp 1 & B616: ASR Kp 2
It is proportional gain for ASR. If we ignore the Integral action than at any time the ASR’s output will
be Kp times the error at that time. To increase the speed response, set a large value. Note that if the
value is too high the actual speed will hunt.
B606: ASR Ti 1 & B617: ASR Ti 2 (Sec)
It is Integral time constant for ASR. If Kp=1 and Error=100% than ASR’s output will be 100% within
this time. The Integral constant Ki is given by,
Ki = Kp/Ti
To increase the speed response, set a small value. Note that if the value is too low then the actual
speed will hunt.
Time
Constant
Output
Frequency
B622
Speed LPF
Tc 2
B604
Speed LPF
Tc 1
B620
ASR Freq 1
B621
ASR Freq 2