Danfoss AKD 2800, Quick Setup Manual, Page: 20 / 77

AKD 2800
Complete AMT:
AMT is completed by giving a RESET signal.
Parameter 108 Stator resistance, Rs is updated
with the optimised value.
Interrupting AMT:
AMT can be interrupted during the optimisation
procedure by giving a STOP signal.
When using the AMT function the following
points should be observed:
- For AMT to be able to define the motor parameters
as well as possible, the correct type plate data for
the motor connected to the frequency converter
must be keyed into parameters 102 to 106.
- Alarms will appear in the display if faults arise
during tuning of the motor.
- As a rule the AMT function will be able to measure
the R
S
values for motors that are 1-2 times larger or
smaller than the frequency converter ’ s nominal size.
- If you wish to interrupt automatic motor tuning,
press the [STOP/RESET] key.
NB!:
AMT may not be performed on motors
connected in parallel, nor may setup changes
be made while AMT is running.
The procedure for AMT controlled from the SLCP:
See section entitled Control unit .
Description of choice:
Select Optimisation on [2] if you want the frequency
converter to perform automatic motor tuning.
108 Stator resistance R
S
(STATOR RESISTAN)
Value:
0.000 - X.XXX
✭
Depends on choice of motor
Function:
After setting of parameters 102-106 Nameplate data,
a number of adjustments of various parameters is
carried out automatically, including 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.
NB!:
Parameters 108 Stator resistance R
S
and 109
Stator reactance X
S
are normally not to be
changed if nameplate data has been set.
Description of choice:
R
S
can be set as follows:
1. Use the factory settings of R
S
which the
frequency converter itself chooses on the basis
of the motor nameplate data.
2. The value is stated by the motor supplier.
3. The value is obtained through manual
measurements: R
S
can be calculated by measuring
the resistance R
PHASE-PHASE
between two phase
terminals. Where R
PHASE-PHASE
is lower than 1-2
Ohms (typical for motors > 5.5 kW, 400 V), a special
Ohm-meter should be used (Thomson-bridge or
similar). R
S
= 0.5 x R
PHASE-PHASE
.
4. R
S
is set automatically when AMT has
been completed. See parameter 107
Auto motor adaption.
109 Stator reactance X
S
(STATOR REACTANCE)
Value:
0.00 - X,XX
✭
Depends on choice of motor
Function:
After setting of parameters 102-106 Nameplate data ,
a number of adjustments of various parameters
are made automatically, including stator reactance
X
S
. The shaft performance can be improved by
fine-tuning R
S
and X
S
, see procedure below.
Description of choice:
X
S
can be set as follows:
1. The value is stated by the motor supplier.
2. The value is obtained through manual
measurements X
S
is obtained by connecting a
motor to mains and measuring the phase-phase
voltage U
M
and the idle current .
3. Use the factory settings of X
S
which the
frequency converter itself chooses on the basis
of the motor nameplate data.
122 Function at stop
(FUNCTION AT STOP)
Value:
✭
Coasting (COAST) [0]
DC hold (DC HOLD) [1]
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.H2.02 -
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