Vacon NX Series Applications Manual page 294

VACON · 294
Table 161: Selections for parameter ID621
Selection
number
0 Not Used
1 TorqMemory
2 Torque Ref
3 Torque forward/Torque reverse See ID633 and 634
626 CL: ACCELERATION COMPENSATION 6 (2.6.23.5)
Use this parameter to set the inertia compensation to make the speed response during
acceleration and deceleration more accurate.
The time is defined as acceleration time to nominal speed with nominal torque. This feature
is used when the inertia of the system is known to achieve the best speed accuracy at
alternating references.
J = System inertia (kg*m
f = Motor nominal frequency (Hz)
nom
T = Motor nominal torque
nom
P = Motor nominal power (kW)
nom
627 CL: MAGNETIZING CURRENT AT START 6 (2.6.23.7)
Use this parameter to set the DC current that is fed into the motor at the start.
Defines the current that is applied to motor when the start command is given (in Closed Loop
control mode). At start this parameter is used together with parameter ID628 to decrease the
time before the motor is able to produce maximum torque.
628 CL: MAGNETIZING TIME AT START 6 (2.6.23.8)
Use this parameter to set the time during which the DC current is fed to the motor before the
acceleration starts.
Defines the time for how long the magnetization current (ID627) is applied to the motor at
start. The magnetizing current at start is used in order to premagnetize the motor before
running. This will improve the torque performance at start. The time needed depends on the
size of the motor. The parameter value varies from 100 ms to 3 seconds. The bigger the
motor the more time is needed.
9
Selection name
Motor will be started at the same torque as it was stopped at
Torque reference is used at start for the startup torque
)
2
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PARAMETER DESCRIPTIONS
Description