CHAPTER 7 - PROGRAMMING INFORMATION AND SUGGESTIONS
155
7.1.6.7 Hydraulic Pump Load Type
(P202=3)
Starting (P120=2 or P120=3):
1) Before any setting, carefully read carefully the steps described
in Starting with Pump Control, item 7.1.5;
2) If the pump control does not meet your requirements or if a con-
trol with better performance is desired, use the torque control;
3) With a linear torque ramp you can obtain a speed curve very
similar to the S-Curve with quadratic loads, as centrifugal pumps;
4) Through the load curve you can set the torque 10% to 20%
higher than the load torque for the initial point P121, and 20%
to 30% higher than the load torque for the end point, P122;
5) Even when the load curve is used, we recommend executing a
setting at the application field. For this, proceed as follows:
5.1) Set P121 to the torque required to start rotating the pump;
5.2) Set P122 to 110% to 130% of the nominal motor torque;
5.3) Set P102 initially to lower values, 10s to 15s, then increase this
setting.
7) The main purpose of the two above mentioned cases is main-
taining the pressure ramp as linear as possible, increasing it
gradually, without causing any kind of sudden oscillation.
8) As already described in the pump control, the use of a measuring
instrument is required for measuring this pressure and so obtai-
ning the best setting;
Figure 7.17
- Manometer showing the pressure increase, linear torque
6) If the load has a higher initial torque, use the quadratic torque
(P120=3 points);
Figure 7.18
- Manometer showing the pressure increase, quadratic torque
Tn(%)
Start
P121
0
P102
Maximum Time
Torque Control
Enable
Load Torque
Tn Nominal
Speed
P122
Tn(%)
Start
P121
0
P102
Torque Control
Enable
Load Torque
Tn Nominal
Speed
P122
P123
Maximum Time
P124
P120 =3
Torque
Control
P122
P123
P104 0
P124
P120 =2
P102
Torque
Control
P122
P121
P104
≠
0
P126
P125
=1
≠
P102
P121
P126
P125
=1
Summary of Contents for SSW06
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