VLT
®
8000 AQUA
Motor size Change-over
0.5kW-7.5kW >10Hz
11 kW - 45 kW >5 Hz
55 kW - 355 kW >3-4 Hz
121 Slip compensation
(SLIP COMPENSAT.)
Value:
-500 - 500 %
✭ 100 %
Function:
Slip compensation is calculated automatically, i.e. on
the basis of the rated motor speed n
M,N
.
In parameter 121, slip compensation can be
adjusted in detail, which compensates for
tolerances in the value of n
M,N
.
This function is not active together with Variable
torque (parameter 101 - variable torque graphs),
Torque control, Speed feedback and Special
motor characteristics.
Description of choice:
Enter a %-value of the rated motor frequency
(parameter 104).
122 Slip compensation time constant
(SLIP TIME CONST.)
Value:
0.05 - 5.00 sec.
✭ 0.50 sec.
Function:
This parameter determines the slip compensation
reaction speed.
Description of choice:
A high value results in slow reaction. Conversely,
a low value results in quick reaction.
If low-frequency resonance problems are encountered,
the time set must be longer.
123 Stator resistance
(STATOR RESIST)
Value:
✭Depends on the choice of motor
Function:
After setting motor data in parameters 102-106, a
number of adjustments of various parameters are
made automatically, including the stator resistance
R
S
. A manually entered R
S
must apply to a cold
motor. The shaft performance can be improved by
fine-tuning R
S
and X
S
, see procedure below.
Description of choice:
R
S
can be set as follows:
1. Automatic motor adaptation, where the frequency
converter actually tests the motor to determine this
value. All compensations are reset to 100%.
2. The values are stated by the motor supplier.
3. The values are obtained by means of
manual measurements:
-R
S
can be calculated by measuring the
resistance R
PHASE-to-PHASE
between two phase
terminals. If R
PHASE-to-PHASE
is lower than 1-2 ohm
(typically motors > 4 (5.4 HP) - 5.5 kW (7.4 HP), 400
V), a special ohm-meter should be used (Thomson
bridge or similar). R
S
=0.5xR
PHASE-to-PHASE
4. The factory settings of R
S
,selectedbythe
frequency converter itself on the basis of the
motor nameplate data, are used.
✭ = factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
106
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