E6581611
F-48
6
function, motor shaft fixing control will be canceled.
Note 3: During shaft fixing control, the carrier frequency becomes the setting of whichever is lower parameter,
f249 or f300.
6.13 Stop at lower-limit frequency operation (sleep function)
f256 : Time limit for lower-limit frequency operation
f259 : Lower limit frequency reach time limit at start-up
f391 : Hysteresis for lower-limit frequency operation
Function
If operation at the lower-limit frequency () is carried out for the time set with , the inverter will
automatically decelerate the motor to stop for the purpose of energy-saving. At that time, “” is
displayed (alternately) on the operation panel.
Stop by this function will be canceled if a frequency command value exceeds the lower-limit frequency
(ll) f391 (Hz), or if the operation command is OFF. This function will not work until the output
frequency reaches ll at the start of operation.
If the output frequency doesn’t reach ll at the start of operation for malfunction of load, the inverter will
automatically stop after the time set with f259 elapses.
[Parameter setting]
Title Function Adjustment range Default setting
f256
Time limit for lower-limit frequency
operation
0.0: Disabled
0.1 - 600.0 (s)
0.0
f259
Lower limit frequency reach time limit at
start-up
0.0: Disabled
0.1 - 600.0 (s)
0.0
f391
Hysteresis for lower-limit frequency
operation
0.0-ul (Hz) 0.2
Note: This function is valid when doing forward/reverse switching.
When starting operation, f256 function will not work until output frequency reaches ll.
When the output frequency exceeds ll, f259 function will be invalid until operation signal is OFF.
Output frequency [Hz]
Time[s]
ON
OFF
ll+f391
ll
Forward/ reverse
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