619 CL: SLIP ADJUST 6 (2.6.23.6)
The motor name plate speed is used to calculate the nominal slip. This value is used to
adjust the voltage of motor when loaded. The name plate speed is sometimes a little
inaccurate and this parameter can therefore be used to trim the slip. Reducing the slip
adjust value increases the motor voltage when the motor is loaded. Value 100% corresponds
to nominal slip at nominal load. See Chapter 8.8 Closed loop parameters (IDs 612 to 621).
620 LOAD DROOPING 23456 (2.6.12, 2.6.15)
The Load drooping function enables a speed drop. This parameter sets the drooping in
percentage of the nominal torque of the motor.
You can use this function when a balanced load is necessary for mechanically connected
motors.
If the motor has a nominal frequency of 50 Hz, the motor is loaded with the nominal load
(100% of the torque), and Load Drooping is set to 10%, the output frequency is let to decrease
5 Hz from the frequency reference.
621 CL: STARTUP TORQUE 6 (2.6.23.11)
Choose here the startup torque.
Torque Memory is used in crane applications. Startup Torque FWD/REV can be used in other
applications to help the speed controller. See Chapter 8.8 Closed loop parameters (IDs 612 to
Table 161: Selections for parameter ID621
Selection
number
Selection name
Description
0
Not Used
1
TorqMemory
Motor will be started at the same torque as it was stopped at
2
Torque Ref
Torque reference is used at start for the startup torque
3
Torque forward/Torque reverse See ID633 and 634
626 CL: ACCELERATION COMPENSATION 6 (2.6.23.5)
Sets the inertia compensation to improve speed response during acceleration and
deceleration. 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.
VACON · 314
PARAMETER DESCRIPTIONS
8
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