Alpha 6000S series User Manual page 125

Chapter 5 Detailed Function Introductions
P3.27 FDT level
P3.28FDT lag
 Note
When the output frequency reaches a certain preset frequency (frequency detection threshold), Y terminal
output will be valid. We called the preset frequency FDT level. In the dropping of output frequency, Y
terminal output keep valid, until the output frequency drops below another certain frequency of FDT level,
which is called release frequency (FDT1 level-FDT1 lag), as shown in Figure. 5-3-9.
P3.29 Frequency upper limit arriving output delay
time
P3.30 Frequency lower limit arriving output delay
time
Notes:

These two functions are enabled when setting D0, Y1, Y2, Y3, relay 1, relay 2 output (3004GB and below
models set DO, relay 1) in P3.19 ~ P3.25 option as ""FDTH upper limit frequency reaching" or "FDTL lower
limit frequency reaching". Typically, these two functions are set to prevent load joggling and signal instability
124
Operating Freq.(Hz)
Reference
Freq.
FAR signal
Figure. 5-3-8 FAR detection diagram
Setting range: 0.00~Maximum frequency [50.00Hz]
Setting range: 0.00~10.00Hz [1.00Hz]
O utput Fre q.
FD T le ve l
FD T s ignal
Fig. 5-3-9 Frequency detection FDT
Detection width
Time
Time
FD T lag
Tim e
Tim e
Setting range: 0.0~100.0s [0.0s]
Setting range: 0.0~100.0s [0.0s]