B3: Speed Search - Omron Q2A Series Technical Manual

12.2 b: APPLICATION
■
b2-18 SCB Current
No.
Name
(Hex.)
b2-18 SCB Current
(0177)
The Short Circuit Braking current cannot be higher than the drive rated current, although a higher current level
can be set using b2-18. The maximum rated current is 120% when the drive is set for Normal Duty (C6-01 = 1
[ND Rating]). The maximum rated current is 150% when the drive is set for Heavy Duty (C6-01 = 0 [HD
Rating]).
◆

b3: SPEED SEARCH

The Speed Search function detects the actual speed of a coasting motor, then restarts the motor before the motor
stops. Use Speed Search in these conditions:
• To continue operation after momentary power loss
• To switch from commercial power supply to drive power
• To restart a coasting fan
For example, the drive output turns off and the motor coasts when there is a momentary loss of power. After you
return power, the drive does Speed Search on the coasting motor, and restarts the motor from the detected speed.
When you use a PM motor, enable b3-01 [SpSrch@Start Selection].
There are two types of Speed Search for induction motors: Current Detection and Speed Estimation. Use
parameter b3-24 [SpSrch Method Selection] to select the type of Speed Search.
Parameter settings are different for different types of Speed Search. Refer to the following table for more
information.
b3-01 [SpSrch@Start Selection]
b3-03 [SpSrch Deceleration Time]
b3-05 [SpSrch Delay Time]
b3-06 [Speed Curr Lev1 for Estimation]
b3-07 [Speed Curr Lev2 for Estimation]
b3-08 [Speed ACR PGain for Estimation]
b3-09 [Speed ACR ITime for Estimation]
b3-10 [Speed Det Gain for Estimation]
b3-14 [Speed Bi-Directional Search]
b3-17 [Speed Retry Current Level]
b3-18 [Speed Retry Delay]
b3-19 [Speed Retry Times]
b3-24 [SpSrch Method Selection]
b3-25 [SpSrch Wait Time]
b3-26 [Dir. Determ. Level]
b3-27 [SS@RUNbeforeBB]
b3-29 [SpSrch BackEMF Threshold]
b3-31 [SpSrch I Ref Level]
b3-32 [SpSrch I End Level]
b3-33 [SpSrch@Uv Selection]
b3-35 [BckEMF Low Detection Level]
b3-36 [HiBackEMF DetLev]
b3-54 [Search Time]
b3-55 [Speed Curr Rise Time]
530
V/f CL-V/f OLV
Sets the Short Circuit Braking Current as a percentage of the motor rated current.
Table 12.7 Speed Search and Related Parameters
Parameter
Description
CLV AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Current Detection 2
x
x
x
-
-
-
-
-
-
x
x
x
x (2)
x
-
x
-
x
x
x
x
x
-
-
Speed Estimation
x (1)
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Default
(Range)
100.0%
(0.0 - 200.0%)
x
-
x
x
x
x
x
x
x
x
x
x
x
x
x
-
-
-
x
x
x
-
-