Yaskawa iQpump Controller Programming Manual - Manual (Page 28)

28 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
Figure 1.21
Figure 21. Speed Search (Estimated Speed Method) after momentary power loss
where the power loss time exceeds the minimum baseblock time
Current Detection Method (b3-01 = 2 or 3): The current detection method starts searching from a predetermined frequency while
monitoring the iQpump drive output current to determine when the rotor speed and the iQpump drive output speed (frequency) match.
The current detection version is not bi-directional. To enable current detection Speed Search at start set b3-01 = “3: SpdscrhI enable” and
program any digital input equal to Speed Search 1 (H1-0x = 61) or Speed Search 2 (H1-0x = 62). Speed Search 1 will start searching from
the max. frequency (E1-04) and ramp down to meet the rotor speed. Speed Search 2 will start searching from the set frequency and ramp
down to meet the rotor speed.
Important: If a UV1 fault occurs when current detection Speed Search is attempted, increase the setting of L2-04.
Important: If an OC fault occurs when Speed Search is attempted after power loss recovery, increase the setting of L2-03.
Figure 1.22
Figure 22. Speed Search (Current Detection Method) at Startup
Figure 1.23
Figure 23. Speed Search (Current Detection Method) after momentary power loss
where the power loss time is less than the minimum baseblock time
AC power supply
Output frequency
Output current
OFF ON
Start using speed detected
Set frequency
reference
Minimum baseblock time
(L2-03)
10 ms
Speed Search Wait Time
(b3-05)
Note: If the frequency immediately before the baseblock is low or the power supply break time is long,
operation may be the same as the search in case 1. Note: If the frequency immediately before the baseblock is low or the power supply off time is long,
operation may be the same as the search in case 1.
Run command
Output frequency
Output current
OFF ON
b3-02
Deceleration time set in b3-03
Set frequency
reference
Minimum baseblock time
(L2-03)
Maximum output
frequency or
set frequency
* Lower limit is set using Speed Search Time (b3-05). * Search Delay Time (b3-05).
Speed search current level
AC power supply
Output frequency
Output current
OFF ON Output frequency before power loss Set frequency
reference
Minimum baseblock time (L2-03)
*1 Baseblock time may be reduced by the output frequency
immediately before baseblock.
*2 After AC power supply recovery, drive waits for the minimum
Speed Search Wait Time (b2-03).
Deceleration
time set in b3-03
b3-02
speed search operating current
*2
*1
b3-05