YASKAWA iQpump Series Programming Manual page 22

Figure 1.19
AC power supply
Output frequency
Output current
Figure 19 Speed Search (Current Detection Method) after momentary power loss where the power loss
Automatic Speed Search for all RUN
Setting of b3-01
0
1
2
3
b3-02 Speed Search Deactivation Current
■
Setting Range: 0 to 200% of the iQpump drive rated output current
Factory Default: 120% of the iQpump drive rated output current
When using the current detection method of Speed Search, parameter b3-02 sets the current level that will determine when the search is
complete and the rotor and output speeds match. When the output frequency is higher than the actual rotor speed the slip causes the
current to be high. As the output frequency is lowered, the closer it comes to the rotor speed, the lower the current draw will be. When the
output current drops below the level as set in b3-02 (100% = iQpump drive Rated Current) the output frequency stops decreasing and
normal operation resumes.
b3-03 Speed Search Deceleration Time
■
Setting Range: 0.1 to 10.0 sec
Factory Default: 2.0 sec
Parameter b3-03 sets the deceleration ramp used by the current detection method of Speed Search when searching for the motor's rotor
speed. Even if Speed Search 2 is selected, for Speed Search at start, the time entered into b3-03 will be the time to decelerate from
maximum frequency (E1-04) to minimum frequency (E1-09).
b3-05 Speed Search Delay Time
■
Setting Range: 0.0 to 20.0 sec
Factory Default: 0.2 sec
In cases where an output contactor is used between the iQpump drive and the motor, extra waiting time is provided after power returns
and before Speed Search is performed. This extra time allows for the contactor to operate. When Speed Search at start is used, b3-05 will
serve as the lower limit of the Minimum Baseblock Time (L2-03).
b3-14 Bi-Directional Speed Search Selection
■
Setting
0 Disabled
1 Enabled (factory default)
The b3-14 parameter can be used to turn off the bi-directional capabilities of the Speed Estimation form of Speed Search. By turning off
the bi-directional capability, the speed search will only try to match the speed in the last known direction.
22
ON
Minimum baseblock time
(L2-03)
time exceeds the minimum baseblock time
commands
No
Yes - Speed Estimation
No
Yes - Current Detection
OFF Output frequency before power loss
Deceleration speed set in b3-03 Deceleration time set in b3-03
Speed search operating time
Speed search wait time (b3-05)
Automatic Speed Search after
momentary power loss and baseblock
Yes - Speed Estimation
Yes - Speed Estimation
Yes - Current Detection
Yes - Current Detection
Description
Set frequency
reference
b3-02
Speed Search Used for Run with
programmed multi-function input
Yes - Speed Estimation
Yes - Speed Estimation
Yes - Current Detection
Yes - Current Detection
YASKAWA TM.iQp.02 iQpump Drive Programming Manual