YASKAWA iQpump Series Programming Manual page 21

Figure 1.16
AC power supply
Output frequency
Output current
Note: If the frequency immediately before the baseblock is low or the power supply off time is long,
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.
operation may be the same as the search in case 1.
Figure 16 Speed Search (Estimated Speed Method) after momentary power loss where the power loss
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 1.17
Run command
Output frequency
Output current
Figure 1.18
AC power supply
Output frequency
Output current
Minimum baseblock time (L2-03)
Figure 18 Speed Search (Current Detection Method) after momentary power loss where the power loss
YASKAWA TM.iQp.02 iQpump Drive Programming Manual
ON
Minimum baseblock time
(L2-03)
time exceeds the minimum baseblock time
OFF ON
Maximum output
frequency or
set frequency
*
Minimum baseblock time
(L2-03)
Figure 17 Speed Search (Current Detection Method) at Startup
ON OFF
*1
*2
time is less than the minimum baseblock time
OFF
Start using speed detected
10 ms
Speed Search Wait Time
(b3-05)
Deceleration time set in b3-03
* Lower limit is set using Speed Search Time (b3-05).
Output frequency before power loss
Deceleration
time set in b3-03
b3-02
speed search operating current
*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).
Set frequency
reference
Set frequency
reference
Speed search current level
b3-02
Search Delay Time (b3-05).
Set frequency
reference
b3-05
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