Danfoss VLT FC 102 Operating Instructions Manual page 62

Commissioning
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.
Program the following parameters in the listed order:
1. Parameter 1-24 Motor Current.
2. Parameter 1-26 Motor Cont. Rated Torque.
3. Parameter 1-25 Motor Nominal Speed.
5 5
4. Parameter 1-39 Motor Poles.
Parameter 1-30 Stator Resistance (Rs).
5.
Enter line to common stator winding resistance
(R ). If only line-line data are available, divide the
s
line-line value with 2 to achieve the line to
common (starpoint) value.
It is also possible to measure the value with an
ohmmeter, which takes the resistance of the
cable into account. Divide the measured value by
2 and enter the result.
6. Parameter 1-37 d-axis Inductance (Ld).
Enter line to common direct axis inductance of
the PM motor.
If only line-line data are available, divide the line-
line value with 2 to achieve the line-common
(starpoint) value.
It is also possible to measure the value with an
inductancemeter, which takes the inductance of
the cable into account. Divide the measured
value by 2 and enter the result.
7. Parameter 1-40 Back EMF at 1000 RPM
Enter line-line back EMF of 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)x1000 = (320/1800)x1000 = 178.
Program this value for parameter 1-40 Back EMF at
1000 RPM.
Test motor operation
1. Start the motor at low speed (100–200 RPM). If
the motor does not turn, check installation,
general programming and motor data.
2. Check if start function in parameter 1-70 PM Start
Mode fits the application requirements.
60
®
VLT HVAC Drive FC 102 Low Harmonic Drive
Rotor detection
This function is the recommended choice for applications
where the motor starts from standstill, for example pumps
or conveyors. On some motors, an acoustic sound is heard
when the impulse is sent out. This does not harm the
motor.
Parking
This function is the recommended choice for applications
where the motor is rotating at slow speed for example
windmilling in fan applications. Parameter 2-06 Parking
Current and parameter 2-07 Parking Time can be adjusted.
Increase the factory setting of these parameters for
applications with high inertia.
Start the motor at nominal speed. If the application does
not run well, check the VVC
recommendations in different applications.
Application
Low inertia applications
I /I
Load
Low inertia applications
50>I
Load
High inertia applications
I /I
Load
High load at low speed
<30% (rated speed)
Table 5.8 Recommendations in Different Applications
If the motor starts oscillating at a certain speed, increase
parameter 1-14 Damping Gain. Increase the value in small
steps. Depending on the motor, a good value for this
parameter can be 10% or 100% higher than the default
value.
Starting torque can be adjusted in parameter 1-66 Min.
Current at Low Speed. 100% provides nominal torque as
starting torque.
Danfoss A/S © 04/2015 All rights reserved.
+ PM settings. Table 5.7 shows
Settings
Increase parameter 1-17 Voltage filter
<5 time const. by factor 5–10
Motor
Reduce parameter 1-14 Damping
Gain.
Reduce parameter 1-66 Min. Current
at Low Speed (<100%).
Keep calculated values.
/I >5
Motor
Increase parameter 1-14 Damping
> 50 Gain, parameter 1-15 Low Speed Filter
Motor
Time Const. and parameter 1-16 High
Speed Filter Time Const..
Increase parameter 1-17 Voltage filter
time const..
Increase parameter 1-66 Min. Current
at Low Speed (>100% for a
prolonged time can overheat the
motor).
MG16I302