YASKAWA
TOEPYAIHV6002A HV600 Drive Programming
191
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Current Detection 2
Use this Speed Search function with induction motors. Set
b3-24 = 2 [Speed Search Method Selection = Current
Detection 2]
. Current Detection Speed Search injects current into the motor to detect the speed of an induction motor.
Speed Search increases the output voltage for the time set in
L2-04 [Powerloss V/f Recovery Ramp Time]
, starting
from the maximum output frequency or the frequency reference.
b3-02:
b3-03:
b3-05:
L2-03:
L2-04:
Figure 2.18 Current Detection 2 after a Momentary Power Loss
Note:
After you restore power, the drive will not do Speed Search until the time set in
b3-05 [Speed Search Delay Time]
expires. This means that
the drive will not always start Speed Search when time set in
L2-03 [Minimum Baseblock Time]
expires.
If you enter the Run command at the same time as Speed Search, the drive will not do Speed Search until the time set
in
L2-03
expires. When
L2-03
<
b3-05
, the drive will use the wait time set in
b3-05
.
b3-02:
b3-03:
L2-03:
L2-04:
Figure 2.19 Speed Search Selection at Start (Current Detection Type)
WARNING!
Sudden Movement Hazard. Do not do Current Detection Speed Search with light loads or a stopped motor. If you do
Auto-Tuning in these conditions, the motor can suddenly accelerate and cause serious injury or death.
Note:
•
You cannot use Current Detection Speed Search with PM motors.
•
If the motor is rotating in reverse, you cannot do Speed Search.
•
If the drive detects
oL1 [Motor Overload]
during Current Detection Speed Search, decrease
b3-03
.
•
If the drive detects
oC [Overcurrent]
or
ov [Overvoltage]
during Current Detection Speed Search after the drive recovers from a
momentary power loss, increase
L2-03
.
