Yaskawa iQpump Controller Programming Manual - Manual (Page 121)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 121
◆ L3-05 Stall Prevention Selection During Running
◆ L3-06 Stall Prevention Level During Running
Setting Range: 30 ~ 200% of the iQpump drive rated output current
Factory Default: 120% of the iQpump drive rated output current
The Stall Prevention During Running function will attempt to avoid an iQpump drive OC fault occurrence while the iQpump drive is
operating at a constant speed. If L3-05 = “0: Disabled,” the iQpump drive may fault if the load increases sufficiently to cause the output
current to reach the OC fault level (180% of the iQpump drive rated output current).
If L3-05 = “1: General Purpose,” the iQpump drive is outputting a constant speed, and the drive’s output current level exceeds the level set
by parameter L3-06 for more than 100 ms the iQpump drive will begin to decelerate at the rate specified by parameter C1-02. The
iQpump drive will continue to decelerate until the output current level drops below the L3-06 level (less a 2% hysteresis). Once the output
current drops below the L3-06 – 2% level the iQpump drive will begin to accelerate at the currently active acceleration rate (either C1-01
or C1-03).
If L3-05 = “2: Decel Time 2,” the iQpump drive will function as described above except C1-04 will be used instead of C1-02 as the
deceleration rate used when the output current exceeds L3-06 for more than 100 ms.
The following Figure 103. demonstrates acceleration when L3-05
≠0.
Figure 1.99
Figure 103. Time Chart for Stall Prevention Level During Running
The L3-06 parameter is set as a percentage of the iQpump drive rated output current. If the iQpump drive still faults when L3-05
≠0, then
either lower the L3-06 or adjust the C1-02 or C1-04 settings for a quicker deceleration.
Setting Description
0 Disabled
1 Decel Time 1 ( factory default )
2 Decel Time 2
a
L3-06
t
Output
Frequency
Output
Current
b
a - Decel time
C1-02 or C1-04.
b – Active accel time
t
b a
a - Decel time
C1-02 or C1-04
b - Active Accel time
TIME