Control Techniques Commander SE Advanced User's Manual page 104

NOTE
In analog reference 1 and analog reference 2 modes, a preset speed will be selected instead of analog reference 1 or
analog reference 2 if the preset speed selected is any other than preset speed 1 even if the preset reference, 1.42, is
not selected. This is because of the easy set-up modes that give the user the flexibility to select between analog
reference 1 and 3 preset speeds, or analog reference 2 and 3 presets speed with only 2 digital inputs.
21.04
21.05
0.0 ~ 3200.0
Parameter
21.04
21.05
The ramp rates are expressed as time for a change of 100Hz on the ramp output. Therefore with a programmed ramp time of
5 seconds the ramp output will reach 50Hz from 0 in 2.5 seconds.
21.06
The motor rated frequency is used to define the voltage to frequency characteristic applied to the drive (see 5.14 and 21.09).
21.07
0 ~ Drive rated current
The motor rated current should be set to the machine nameplate value for rated current.
This value is used in the following:
Current limit, see parameter 4.07
Ixt system, see parameter 4.15
Slip compensation, see parameter 5.36
Dynamic v to f control, see parameter 5.13
21.08
The rated full load rpm is used with the motor rated frequency and No. of poles to calculate the rated slip of the induction
machine in Hz.
rated slip = motor rated frequency - (no. of pole pairs x motor full load rpm / 60)
The rated slip is used to calculate the frequency adjustment required to compensate for slip from the following equation:
slip compensation = rated slip x active current / rated active current
If slip compensation is required this parameter should be set to the name-plate value, which should give the correct rpm for a
hot machine.
Sometimes it will be necessary to adjust this when the drive is commissioned because the nameplate value might be
inaccurate. Slip compensation will operate correctly for below base speed and field weakening operation. Slip compensation
will not cause a frequency in the opposite direction to the post ramp frequency reference.
104
Motor 2 Acceleration ramp rate
Motor 2 Deceleration ramp rate
Function
Motor 2 Accel 1
Motor 2 Decel 1
Motor 2 rated frequency
Europe> 50.0
1000.0
USA>
Motor 2 motor rated current
Drive rated
current
Motor 2 motor rated full load rpm
Europe> 1500
0 ~ 9999
USA>
= 21.06 - ((21.11 / 2) x 21.08 / 60)
s/100Hz RW Uni
Default
5.0
10.0
Hz RW Uni
60.0
A RW Uni
rpm RW Uni
1800
Commander SE Advanced User Guide
Issue Number: 4