YASKAWA GA700 Technical Manual page 608

11.3 b: Application
Parameters
b3-17 [Speed Est. Retry Current Level]
b3-18 [Speed Est. Retry Detection Time]
b3-19 [Number of Speed Search Restarts]
b3-24 [Speed Search Method Selection]
b3-25 [Speed Search Wait Time]
b3-26 [Direction Determining Level]
b3-27 [Start Speed Search Select]
b3-29 [Speed Search Back-EMF Threshold]
b3-31 [Search Current Level 1]
b3-32 [Search Current Level 2]
b3-33 [Spd Search during UV Selection]
b3-35 [Voltage Detection Low Level]
b3-36 [Wait Restart Level]
b3-54 [Search Time]
b3-55 [Current Increment Time]
Note:
Note the following points when using Speed Estimation Speed Search.
• Perform Rotational Auto-Tuning before configuring the speed search function to use Speed Estimation Speed Search with V/f Control.
Perform Stationary Auto-Tuning for Line-to-Line Resistance process again when the wire length between the drive and motor has
changed since Auto-Tuning was last performed.
• Use Short Circuit Braking to restart the motor and not Speed Search when A1-02 = 5, 6 [PM Open Loop Vector Control, PM Advanced
Open Loop Vector], if there is a substantial wiring distance between the motor and drive, or if the motor is coasting at greater than or
equal to 200 Hz.
■
Current Detection 2
This Speed Search function is used with induction motors. Set b3-24 = 2 [Speed Search Method Selection =
Current Detection 2]. Current Detection Speed Search detects the speed of an induction motor by injecting current
into the motor. Speed Search increases the output voltage for the time set in L2-04
[MomentPowLossVolRecoveryRampTime], starting from either the maximum output frequency or the frequency
reference.
Figure 11.28 Current Detection Speed Search after Momentary Power Loss
Note:
Once power is restored, the drive will not execute Speed Search until the time set in b3-05 [Speed Search Delay Time] has passed.
Consequently, the drive sometimes will not begin Speed Search even though the time set in L2-03 [Momentary Power Loss Min BB
Time] has already passed.
If the Run command is entered at the same time as Speed Search, the drive will not execute Speed Search until the
time set in L2-03 has passed. If the value set in L2-03 is shorter than b3-05, then the drive will use the wait time
set in b3-05.
608
Current Detection 2
x
x
x
x (2)
x
-
x
-
x
x
x
x
x
-
-
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Speed Estimation
x
x
x
x (1)
x
x
x
-
-
-
x
x
x
-
-