12.3 b: Application
736 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Set Speed Search to H1-xx to do the function externally. You cannot set external Speed Search 1 and 2 at the same
time.
Table 12.23 Execute Speed Search via the Digital Input Terminals
H1-xx Setting Name Current Detection 2 Speed Estimation
61 Speed Search from Fmax ON: Speed Search starts from E1-04 [Maximum Output
Frequency].
External Speed Search commands 1 and 2 work the
same.
The drive estimates the motor speed, then starts Speed
Search from the estimated speed.
62 Speed Search from Fref ON: Speed Search starts from the frequency reference
immediately before you input the Speed Search
command.
• Do Speed Search with Each Auto Restart
Set L5-01 [Number of Auto-Restart Attempts] = 1 or more. After an Auto Restart fault, the drive automatically does
Speed Search.
• Do Speed Search after Momentary Power Loss
Set L2-01 = 1, 2 [Power Loss Ride Through Select = Enabled for L2-02 Time, Enabled while CPU Power Active].
• Do Speed Search after You Clear the External Baseblock Command
If you clear the external baseblock command, the drive will do Speed Search in these conditions;
– There is an active Run command
– The output frequency is higher than the minimum frequency
■ b3-01: Speed Search at Start Selection
No.
(Hex.)
Name Description
Default
(Range)
b3-01
(0191)
Speed Search at Start
Selection
Sets the Speed Search at Start function so the drive will do Speed Search with each Run command.
Determined by A1-02
(0, 1)
0 : Disabled
Enter a Run command to start to operate the drive at the minimum output frequency.
When the Run command is enabled and the Speed Search from Fmax or Fref [H1-xx = 61, 62] is input from a multi-
function input terminal, the drive will do Speed Search and start to operate the motor.
1 : Enabled
Enter the Run command to do Speed Search. The drive completes Speed Search, then starts to operate the motor.
Note:
If you set b3-01 = 1 when b3-24 = 2 [Speed Search Method Selection = Current Detection 2], too much current flows at start. Too much
current at start will decrease the service life of the drive IGBT.
■ b3-02: SpeedSearch Deactivation Current
No.
(Hex.)
Name Description
Default
(Range)
b3-02
(0192)
SpeedSearch Deactivation
Current
Sets the current level that stops Speed Search as a percentage of the drive rated output current.
Usually it is not necessary to change this setting.
Determined by A1-02
(0 - 200%)
If the drive cannot restart the motor, decrease this setting.
■ b3-03: Speed Search Deceleration Time
No.
(Hex.)
Name Description
Default
(Range)
b3-03
(0193)
Speed Search Deceleration
Time
Sets the deceleration time during Speed Search operation. Set the length of time to decelerate from
the maximum output frequency to the minimum output frequency.
2.0 s
(0.1 - 10.0 s)
This is the output frequency deceleration time used by Current Detection Speed Search and by the Current Injection
Method of Speed Estimation Speed Search.
Note:
• When A1-02 = 8 [Control Method Selection = EZOLV], this parameter takes effect only in Expert Mode.
• If the drive detects oL1 [Motor Overload] during Current Detection Speed Search, decrease the value set in b3-03.
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