4-130
Figure 4.3.64 Speed search and operation commands
. The speed search can not be applied to the motor whose capacity is greater or less two times
than the inverter capacity, or to high-speed motor.
. When using V / F mode, it is necessary to perform the parameter adjustment of static-type
motor.
. When using the SLV mode, it is necessary to perform the parameter adjustment of rotary-type
motor, using longer motor wires and then perform the parameter adjustment of static-type
motor.
. The speed search uses current detecting law. 07-24 defines the direction of detection, when
1 07-24=1, bidirectional speed detection:
. In the beginning, the current controller will send the step current set by 07-19 to detection
the direction. When the direction is determined, the current controller will send the
current of speed search set by 07-20 and start the speed search, from the restart after
momentary power failure (external speed search command 2, 03-00 to 03-07 = 34), or
from the highest frequency (external speed search command 1, 03-00 to 03-07 = 19).
2 07-24=0, bidirectional speed search off:
. Ignoring the direction search, the current controller sends the current of speed search for
direct speed search.
. Usually, if the speed search is not completed (eg, motor speed is too low), speed search
timing-out warning will enabled. If this situation occurs frequently, please set 07-19 to enable
DC braking and restart.
(1). Speed Direction Search Operating Current (07-19)
. Be used in bidirectional speed search only ( when 07-24 = 1)
. Set bidirectional current level
. If speed search fails at low speed (above 5Hz), please increase the set value. Note that if
set value is too high, it will generate a slight DC braking effect.
(2). Speed Search Operating Current (07-20)
. Suitable for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
. Set speed search current Level.
. The set value must be lower than the excitation current (02-09) and must equal to the
no-load current. If the no-load current is unknown, it is recommended to start from 20%
for setting. Excessive speed search current will cause the inverter output saturation.
. In the case of momentary power failure, the speed search should be used. If the
overcurrent (OC) is detected, increase the minimum base interdiction time (07-18).
(3). Integral time of speed searching (07-21)
. Suitable for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
. Set the integral time during speed search.
. If OV occurs, increase the set value to make the speed search time longer. You can
decrease the set value if quick start is required
(4). Delay time of speed searching (07-22)
. If there is contactor at the inverter output side, 07-22 search speed can be set to delay
the time.
. The factory setting is 0.2 second, the inverter begins the speed search after the delay
time. If 07-22 = 0.0, the speed search delay function will be disabled.
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