REFUspeed RS51 Start-up 8-3
DOK-RD500*-RS51*******-IB02-EN-P
8.3 Motor optimization / motor evaluation
Motor running under no-load conditions
In the steady-state condition, the drive converter current should be ap-
prox. 1/3 of the rated motor current.
If a significant deviation is identified, then the motor data, which was en-
tered in Quick-Setup, can be checked to ensure that it is correct, and the
mechanical load can be checked to ensure that it moves freely.
Running-up / accelerating under load
If the run-up / accelerating current is too high when the load is coupled, an
additional voltage boost can be selected using parameter P0185 U
a
.This
means, that the point U
a
on the characteristic is increased which reduces
the accelerating current and increases the available starting torque.
Procedure
Increases the point U
a
on the characteristic step-by-step, until the starting
current has reached the lowest value. The motor current starts to in-
crease again if the voltage boost is too high.
We also recommend, that when the drive is accelerating, and in steady-
state operation, the current limiting does not intervene. When required,
the current limit should be increased in parameter P0532, so that the full
motor dynamic performance can be utilized and the motor can be pre-
vented from stalling.
Other measures to reduce the starting current include extending the “Ac-
celerating ramp” (P0280) or selecting the “Heavy-duty starting function”
(P0539) with a parameterized “Delay time after start” (P0544).
8.4 General information
• If you wish to reset all of the parameters to the factory setting due to,
for example, incorrect programming, then use the “Load parameter
set” with parameter P0071.
• Fault acknowledgement: There are three ways to acknowledge a fault.
– using the “Esc” button on the operator panel.
– pressing the “RESET” button S9 on the control card (the cover
must be removed)
– controlling/energizing a configured digital input with the “Fault ac-
knowledgement” function.
• Comment: If a fault develops during operation, and a fault is acknowl-
edged, the “Power-on inhibit” message is displayed. This means that
the drive converter has gone into fault condition. A “Stop” command
must be entered in order to enter the “Switch-on enable” status.
LSA Control S.L. www.lsa-control.com comercial@lsa-control.com (+34) 960 62 43 01
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