
68
8: First DC brake, then starting. DC braking current level and braking time according to
F507 and F508.
The f500 parameter detects the rotating speed and rotational direction of the motor
during coasting ing the event of momentary power failure, and then after power has been
restored, restarts the motor smoothly (motor speed search function).
This parameter also allows commercial power operation to be switched to inverter
operation without stopping the motor. During operation, "a-08" is displayed. During the
retry mode see f400), the motor speed search function operated automatically as
required and thus allows smooth motor restarting.
At restart, it takes about 300 ms for the inverter to check to see the number of
revolutions of the motor. For this reason, the start-up takes more time than usual. Use
this function when operating a system with one motor connected to one inverter. This
function may not operate properly in a system configuration with multiple motors
connected to one inverter.
Setting f500 =1, (3): This function operates after power has been restored following
detection of an undervoltage by the main circuits and control power.
Setting f500 =2, (3): This function operates after the standby terminal((input terminal
function =1) connection has been opened first and then connected again.
Setting f500 =4, a motor speed search is performed each time operation is started.This
function is useful especially when the motor is not operated by the inverter but it is
running because of external force.
Setting f500 = 0 (Disabled) and disabling the retry function (f400=0), when apply the
inverter to crane or hoist. Such machines may have its load moved downward during the
above waiting time from input of the operation starting command to the restart of the
motor.
NO.
Parameter Name
Setting Range
Default
f501
auto-stop time limit for lower-limit
frequency operation
0.0~600.0s
0.1
0: disabled
(
0.0
)
. None.
1: Enabled
(
0.1~600.0s
)
. If operation is carried out continuously at a frequency below
the lower-limit frequency (f009) for the period of time set with f501, the inverter will enter
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