Learning Advanced Features
Multi-function relay
1 item
Multi-function
output 1 item
Speed Search Operation Setting Details
Select a speed search type.
The speed search is carried out as it controls the
inverter output current during idling below the
CON-72 (SS Sup-Current) parameter setting. If the
direction of the idling motor and the direction of
operation command at restart are the same, a
stable speed search function can be performed at
about 10 Hz or lower. However, if the direction of
the idling motor and the direction of operation
command at restart are different, the speed search
does not produce a satisfactory result because the
direction of idling cannot be established.
The speed search is carried out as it PI controls
the ripple current which is generated by the
counter electromotive force during no-load rotation.
Because this mode establishes the direction of the
idling motor (forward/reverse), the speed search
function is stable regardless of the direction of the
idling motor and direction of operation command.
However because the ripple current is used which
is generated by the counter electromotive force at
idle (the counter electromotive force is proportional
to the idle speed), the idle frequency is not
determined accurately and re-acceleration may
start from zero speed when the speed search is
performed for the idling motor at low speed (about
10 - 15 Hz, though it depends on motor
characteristics).
Speed search can be selected from the following 4 options. If the top
display segment is on, it is enabled (On). If the bottom segment is on, it
is disabled (Off).
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