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6
Speed Search
The speed search function detect the actual speed of a motor that is coasting without control and restart it
smoothly from that speed. It is also activated after momentary power loss detection when L2-01 is set to
enabled.
Related Parameters
* 1. The factory setting will change when the control method is changed. (Open loop vector control factory settings are given.)
* 2. Factory settings depend on Inverter capacity. (The values shown are for a 200 V Class Inverter for 0.4 kW.)
Multi-function Digital Inputs
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
b3-01 Speed search selection (current detection or speed calculation)
2
*1
No A A A No
b3-02 Speed search operating current (current detection) 120% No A No A No
b3-03 Speed search deceleration time (current detection) 2.0 s No A No A No
b3-05 Speed search wait time (current detection or speed calculation) 0.2 s No AAAA
b3-10 Speed search compensation gain 1.10 No A No A No
b3-14 Speed search rotation selection direction 1 No A A A No
L2-03 Min. baseblock time
0.1 s
*1
No AAAA
L2-04 Voltage recovery time
0.3 s
*2
No AAAA
Set
Value
Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
61
External search command 1
OFF: Speed search disabled (Start from lowest output frequency)
ON: Speed calculation: Calculates the motor speed, and starts search from calculated speed
Current detection: Starts speed search from maximum output frequency
Yes No Yes No
62
External search command 2
OFF: Speed search disabled (Start from lowest output frequency)
ON: Speed calculation: Calculates the motor speed, and starts search from calculated speed,
same operation as external search command 1
Current detection: Starts speed search from set frequency (reference frequency when search
command was input).
Yes No Yes No
64
External search command 3
OFF: Inverter is base blocked
ON: Inverter starts operation using speed search (same operation as speed search 2)
Yes Yes Yes Yes