REXROTH RD 500 Series, Applications Manual

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RD 500 RD51 Commissioning
9-3
DOK-RD500*RD51*******-IB04-EN-P
9.3 Motor optimization / motor evaluation
Motor running under no-load conditions
In the steady-state condition, the drive converter current should be
approx. 1/3 of the rated motor current.
If a significant deviation is identified, then the motor data, which was
entered 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
increase 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
prevented from stalling.
Other measures to reduce the starting current include extending the
“Accelerating ramp” (P0280) or selecting the “Heavy-duty starting
function” (P0539) with a parameterized “Delay time after start” (P0544).
9.4 General Information
•
Using the copy function, you can quickly commission several
converters (refer to section 7.2 )
•
If you wish to reset all of the parameters to the factory setting, e.g. as
a result of incorrect programming, use the “Load factorySetting”
function with parameter P0071.
•
Note: If a fault develops during operation, and the fault is
acknowledged, then “Start inhibit” is displayed. This means that the
converter has locked itself. In order to get to the “Ready to power-up”
status, a “Stop” command must be issued.