Output Frequency; Output Voltage; Output Power; Motor Rpm - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and Parameter
structure display x.00
5.01

Output frequency

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Closed-loop vector, Servo,Regen: VM = 0
Open-loop
Range Closed-loop vector, Servo
Regen
Update rate 250µs write
Open-loop
Although the range for scaling purposes is ±SPEED_FREQ_MAX, 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.
Closed-loop vector and Servo
In these modes the output frequency is not controlled directly, and so the output frequency displayed in this parameter is calculated by measuring the
frequency of the controller reference frame.
Regen
In Regen mode the supply frequency is shown. Negative values indicate negative phase rotation of the supply.
5.02

Output voltage

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
This is the modulus of the r.m.s. fundamental line to line voltage at the inverter output.
5.03

Output power

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
Open-loop, Closed-loop vector and Servo modes
The output power is the dot product of the output voltage and current vectors. Positive power indicates power flowing from the drive to the motor
(motoring) and negative power indicates power flowing from the motor to the drive (regen).
Regen mode
The output power is the dot product of the output voltage and current vectors. Positive power indicates power flowing from the supply to the drive, and
negative power indicates power flowing from the drive to the supply.
5.04

Motor rpm

Drive modes Open-loop
Bit SP
Coding
Range Open-loop
Update rate Background write
The motor rpm is calculated from the post ramp reference (Pr 2.01) for normal operation, or the slave frequency demand (Pr 3.01) if frequency slaving
is being used. The speed of rotation is calculated as follows:
rpm = 60 x frequency / no. of pole pairs
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 = 0) 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. If frequency slaving is being used
there will be an error due to the slip frequency. However, in normal operation the result will be reasonably accurate provided that the slip
compensation has been set up correctly in the rated full load rpm parameter (Pr 5.08).
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
FI DE Txt VM DP ND
1 1 1 1
±SPEED_FREQ_MAX Hz
±1250.0 Hz
±100.0 Hz
FI DE Txt VM DP ND
1 1 1
0 to AC_VOLTAGE_MAX V
FI DE Txt VM DP ND RA NC NV
1 1 2 1
±POWER_MAX kW
FI DE Txt VM DP ND
1 1
±180,000 rpm
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Serial comms
Macros
protocol
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
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