Pm Motor Setup In Vvc - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Commissioning
Application-specific adjustment when running Flux
Flux mode is the preferred control mode for optimum
shaft performance in dynamic applications. Perform an
AMA since this control mode requires precise motor data.
Depending on the application, further adjustments may be
required.
See Table 5.7 for application-related recommendations.
Application Settings
Low-inertia applications Keep calculated values.
High-inertia applications Parameter 1-66 Min. Current at Low
Speed.
Increase current to a value between
default and maximum depending on
the application.
Set ramp times matching the
application. Too fast ramp up causes
an overcurrent or overtorque. Too
fast ramp down causes an
overvoltage trip.
High load at low speed Parameter 1-66 Min. Current at Low
Speed.
Increase current to a value between
default and maximum depending on
the application.
No-load application Adjust parameter 1-18 Min. Current at
No Load to achieve smoother motor
operation by reducing torque ripple
and vibration.
Flux sensorless only Adjust parameter 1-53 Model Shift
Frequency.
Example 1: If the motor oscillates at
5 Hz and dynamics performance is
required at 15 Hz, set
parameter 1-53 Model Shift Frequency
to 10 Hz.
Example 2: If the application
involves dynamic load changes at
low speed, reduce
parameter 1-53 Model Shift Frequency.
Observe the motor behaviour to
make sure that the model shift
frequency is not reduced too much.
Symptoms of inappropriate model
shift frequency are motor oscillations
or frequency converter tripping.
Table 5.7 Recommendations for Flux Applications
MG20MC22
Operating Instructions

5.4.4 PM Motor Setup in VVC

NOTICE!
Only use permanent magnet (PM) motor with fans and
pumps.
Initial programming steps
1.
2.
Programming motor data
After selecting PM motor in parameter 1-10 Motor
Construction, the PM motor-related parameters in
parameter groups 1-2* Motor Data, 1-3* Adv. Motor Data
and 1-4* are active.
The necessary data can be found on the motor nameplate
and in the motor data sheet.
Programme the following parameters in the listed order:
1.
2.
3.
4.
5.
6.
7.
Danfoss A/S © 01/2015 All rights reserved.
Activate PM motor operation
Parameter 1-10 Motor Construction, select [1] PM,
non salient SPM.
Set parameter 0-02 Motor Speed Unit to [0] RPM.
Parameter 1-24 Motor Current.
Parameter 1-26 Motor Cont. Rated Torque.
Parameter 1-25 Motor Nominal Speed.
Parameter 1-39 Motor Poles.
Parameter 1-30 Stator Resistance (Rs).
Enter line to common stator winding resistance
(Rs). If only line-line data is available, divide the
line-line value with 2 to achieve the line to
common (starpoint) value.
Parameter 1-37 d-axis Inductance (Ld).
Enter line to common direct axis inductance of
the PM motor.
If only line-line data is available, divide the line-
line value by 2 to achieve the line-common
(starpoint) value.
Parameter 1-40 Back EMF at 1000 RPM.
Enter line-to-line back EMF of the PM motor at
1000 RPM mechanical speed (RMS value). Back
EMF is the voltage generated by a PM motor
when no frequency converter is connected and
the shaft is turned externally. Back EMF is
normally specified for nominal motor speed or for
1000 RPM measured between 2 lines. If the value
is not available for a motor speed of 1000 RPM,
calculate the correct value as follows: If back EMF
is for example 320 V at 1800 RPM, it can be
calculated at 1000 RPM as follows: Back EMF =
(Voltage / RPM)*1000 = (320/1800)*1000 = 178.
This is the value that must be programmed for
parameter 1-40 Back EMF at 1000 RPM.
+
5
29
5