Description of choice:
Select
Optimisation on
[2] if you want the frequency converter to perform
automatic motor tuning.
108
Stator resistance R
S
Value:
0.000 - X.XXX
Ω
Depends on choice of motor
Function:
After setting of parameters 102-106
Nameplate data,
a number of ad-
justments 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 name-
plate 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.
R
S
= 0.5 x R
PHASE-PHASE
.
4.
R
S
is set automatically when AMT has been completed. See pa-
rameter 107
Auto motor adaption.
109
Stator reactance X
S
Value:
0.00 - X,XX
Ω
Depends on choice of motor
Function:
After setting of parameters 102-106
Nameplate data
, a number of ad-
justments 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 ob-
tained by connecting a motor to mains and measuring the
phase-phase voltage U
M
and the idle current
φ
.
Xs
=
UM
3 ×
I
ϕ
−
XL
2
X
L
: See parameter 142.
3.
Use the factory settings of X
S
which the frequency converter it-
self chooses on the basis of the motor nameplate data.
117
Resonance dampening
Value:
0 - 100 %
0 %
Function:
Reduces the output voltage when running at low load for avoiding reso-
nance phenomena.
Description of choice:
If 0 is selected, there will be no reduction. If 100 % is selected, the volt-
age is reduced to 50% at no load.
119
High start torque
Value:
0.0 - 0.5 sec.
0.0 sec.
Function:
To ensure a high start torque approx. 1.8 x I
INV.
can be permitted for max.
0.5 sec. The current is, however, limited by the frequency converter's
(inverter's) safety limit. 0 sec. corresponds to no high start torque.
Description of choice:
Set the necessary time for which a high start torque is required.
120
Start delay
Value:
0.0 - 10.0 sec.
0.0 sec.
Function:
This parameter enables a delay of the start-up time after the conditions
for start have been fulfilled. When the time has passed, the output fre-
quency will start by ramping up to the reference.
Description of choice:
Set the necessary time before commencing to accelerate.
121
Start function
Value:
DC hold during start delay time
(DC HOLD/DELAY TIME)
[0]
DC brake during start delay time
(DC BRAKE/DELAY TIME)
[1]
Coasting during start delay time
(COAST/DELAY TIME)
[2]
Start frequency/voltage clockwise
(CLOCKWISE OPERATION)
[3]
Start frequency/voltage in reference direction
(VERTICAL OPERATION)
[4]
Function:
This is where to choose the required mode during the start delay time
(parameter 120
Start delay time
).
Description of choice:
Select
DC hold during start delay time
[0] to energize the motor with a
DC hold voltage during the start delay time. Set voltage in parameter 137
DC hold voltage
.
Choose
DC brake during start delay time
[1] to energize the motor with
a DC brake voltage during the start delay time. Set voltage in parameter
132
DC brake voltage
.
Choose
Coasting during start delay time
[2] and the motor will not be
controlled by the adjustable frequency drive during the start delay time
(inverter turned off).
Choose
Start frequency/voltage clockwise
[3] to obtain the function de-
scribed in parameter 130
Start frequency
and 131
Voltage at start
during
start delay time. Regardless of the value assumed by the reference signal,
the output frequency equals the setting in parameter 130
Start frequen-
4 Programming
VLT
®
Decentral FCD 300 Design Guide
74
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
4
