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74
Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Although the range for scaling purposes is ±550 Hz, the actual parameter value can be increased beyond this range by slip compensation. This
parameter gives the output frequency of the drive, i.e. the sum of the post ramp reference and the slip compensation.
This is the modulus of the r.m.s. fundamental line-to-line voltage at the inverter output.
Total output power of the drive (positive for power flow out of the drive's output terminals). Output power of the drive is calculated from the in phase
components of voltage and current such that the total real power output is measured.
Where:
AC_VOLTAGE_MAX = 0.7446 x DC_VOLTAGE_MAX
The motor speed is calculated from the post ramp reference (Pr
2.01
). The speed of rotation is calculated as follows:
The result will be fairly accurate provided the slip compensation has been set up correctly with the rated full load speed parameter (Pr
5.08
). This
calculation relies on the number of motor poles being set up correctly in Pr
5.11
, or if auto mode is selected (Pr
5.11
= Auto) then it relies on a
reasonably accurate value of motor rated speed being set in Pr
5.08
to allow correct calculation of the motor poles.
This is shown on the drive’s display when Pr
23
is set to SP or Cd.
When set to Cd, speed displayed is scaled in customer defined units.
Voltage across the internal DC bus of the drive.
5.01
Motor frequency {85}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
1
1
Range
±
550 Hz
Update rate
21 ms
5.02
Motor voltage {86}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
1
1
Range
0 to AC_VOLTAGE_MAX V
Update rate
Background
5.03
Output power
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
2
1
1
1
Range
±
POWER_MAX kW
Update rate
Background
5.04
Motor speed {87}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
±
9999 rpm
Update rate
Background
5.05
DC bus voltage {84}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
1
1
Range
0 to +DC_VOLTAGE_MAX V
Update rate
Background
Output power range
3 AC_VOLTAGE_MAX
×
RATED_CURRENT_MAX 2
×
×
1000
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
speed
60 Frequency No. of pole pairs
⁄
×
60 Pr 2.01 Pr 5.11 2
⁄
(
)
⁄
×
=
=
NOTE
Summary of Contents for 2202
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