LSIS 6731001500, User Manual

Page: 257 / 659

244
Learning Advanced Features
Code Description
CON-70 SS Mode
Select a speed search type.
Setting Function
0 Flying Start-1 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.
1 Flying Start-2 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).
CON-71 Speed
Search
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).
Item Bit Setting On Status Bit setting Off Status
Keypad
Type and Functions of Speed Search Setting
Setting Function
bit4 bit3 bit2 bit1