YASKAWA iQpump Series Programming Manual page 103

L3-05 Stall Prevention Selection During Running
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Setting
0 Disabled
1 Decel Time 1 ( factory default )
2 Decel Time 2
L3-06 Stall Prevention Level During Running
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Setting Range: 30 to 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 demonstrates acceleration when L3-05≠0.
Figure 1.88
Output
Frequency
Output
Current
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.
YASKAWA TM.iQp.02 iQpump Drive Programming Manual
a a
Figure 93 Time Chart for Stall Prevention Level During Running
Description
a
b
t
b
b
L3-06
t
TIME
- Decel time
a - Decel time
C1-02 or C1-04.
C1-02 or C1-04
– Active accel time
b - Active Accel time
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