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Speed Search
The speed search function finds the actual speed of the motor that is rotating using inertia, and then starts
smoothly from that speed. When restoring power after a temporary power loss, the speed search function
switches connection from the commercial power supply, and then restarts the fan that is rotating using inertia.
Related Parameters
Name
Parameter
Number
Display
Speed search
Enables/disables the speed search
selection (cur-
function for the run command and
rent detection
sets the speed search method.
or speed cal-
0:Disabled, speed calculation
culation)
1: Enabled, speed calculation
2: Disabled, current detection
3: Enabled, current detection
Speed Calculation:
When the search is started, the
motor speed is calculated and
b3-01
acceleration/deceleration is
performed from the calculated
speed to the specified frequency
SpdSrch at
(motor direction is also searched).
Start
Current Detection:
The speed search is started from
the frequency when power was
momentarily lost and the
maximum frequency, and the
speed is detected at the search
current level.
Speed search
Sets the speed search operation
operating cur-
current as a percentage, taking the
rent (current
Drive rated current as 100%.
b3-02
detection)
Not usually necessary to set. When
restarting is not possible with the
SpdSrch Cur-
factory settings, reduce the value.
rent
Speed search
Sets the output frequency decelera-
deceleration
tion time during speed search in
time (current
1-second units.
b3-03
detection)
Set the time for deceleration from
the maximum output frequency to
SpdSrch Dec
the minimum output frequency.
Time
Speed search
Sets the contactor operating delay
wait time
time when there is a contactor on
(current detec-
the output side of the Drive. When
b3-05
tion or speed
a speed search is performed after
calculation)
recovering from a momentary
power loss, the search operation is
Search Delay
delayed by the time set here.
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Setting
Description
Range
0 to 3
0 to
200
0.1 to
10.0
0.0 to
20.0
Continuing Operation
Control Methods
Change
Factory
V/f
during
Setting
V/f
with
Operation
Vector
PG
*1
No
A
A
2
*2
No
A
No
100%
2.0sec
No
A
No
0.2sec
No
A
A
Open
Open
Loop
Flux
Loop
Vector
Vector
1
2
A
No
A
A
No
A
A
No
No
A
A
A
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Troubleshooting
