Menu 5
82
Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Based on the parameters normally used for the motor equivalent circuit for transient analysis, i.e. L
s
= L
1
+ L
m
, L
r
= L
2
+ L
m
, the transient inductance
is given by:
σ
L
s
= L
s
- (L
m
2
/ L
r
)
The transient inductance is used as an intermediate variable to calculate the power factor.
0
: OFF Slip compensation disabled
1
: On Slip compensation enabled
The level of slip compensation is set by the rated frequency and rated speed parameters. Slip compensation is only enabled when this parameter is
set to On(1) and Pr
5.08
is set to a value other than zero or synchronous speed.
Selects the units for the displayed speed.
0
:
Fr
Drive output in Hz (Pr
2.01
)
1
:
SP
Motor speed in RPM (Pr
5.04
)
2
:
Cd
Machine speed in customer defined units (Scaled from Pr
5.04
)
See
Parameter scaling
on page 139 for information on how to scale the rpm (Pr
5.04
) when customer defined units is selected.
0
: OFF Auto-switching frequency change enabled
1
: On Auto-switching frequency change disabled
The drive thermal protection scheme (see Pr
on page 80) reduces the switching frequency automatically when necessary to prevent the drive
from overheating. It is possible to disable this feature by setting this bit parameter to On(1). If the feature is disabled the drive will trip immediately on
O.ht1 when the IGBT temperature gets too high.
This is only operational with the IGBT junction temperature (Pr
7.34
).
5.25 to 5.26
Unused parameters
5.27
Enable slip compensation
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
OFF(0) or On(1)
Default
On(1)
Update rate
Background
5.28 to 5.33
Unused parameters
5.34
Speed display units {23}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
Fr(0), SP(1), Cd(2)
Default
Fr(0)
Update rate
Background
5.35
Disable auto-switching frequency change
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
Range
OFF(0) or On(1)
Default
OFF(0)
Update rate
Background
R
1
jwL
1
jwL
2
R
2
/s
jwL
m
Steady state per phase equivalent circuit
of an induction motor
NOTE
NOTE
Содержание 2202
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