Check Motor Rotation - Danfoss VLT FC 103 Operating Instructions Manual

Start Up and Functional Tes...
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 will also take the
inductance of the cable into account. Divide the
measured value by 2 and enter the result.
7.
1-40 Back EMF at 1000 RPM
Enter line to line back EMF of PM Motor at 1000
3 3
RPM mechanical speed (RMS value). Back EMF is
the voltage generated by a PM motor when no
drive is connected and the shaft is turned
externally. Back EMF is normally specified for
nominal motor speed or for 1000 RPM measured
between two lines. If the value is not available for
a motor speed of 1000 RPM, calculate the correct
value as follows: If back EMF is e.g. 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 1-40 Back EMF at 1000
RPM
T T est Motor Operation
1. Start the motor at low speed (100 to 200 RPM). If
the motor does not turn, check installation,
general programming and motor data.
2. Check if start function in 1-70 PM Start Mode fits
the application requirements.
Rotor detection
This function is the recommended choice for applications
where the motor starts from standstill e.g. 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 eg. windmilling
in fan applications. 2-06 Parking Current and 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. In case the application
does not run well, check the VVC
Recommendations in different applications can be seen in
Table 3.2.
34
inverter.ru (812) 702-47-50
VLT Refrigeration Drive FC 103 1.1-90 kW Operating Instructions
plus
PM settings.
MG16E202 - VLT® is a registered Danfoss trademark
Application Settings
Low inertia applications 1-17 Voltage filter time const. to be
I /I <5 increased by factor 5 to 10
Load Motor
1-14 Damping Gain should be
reduced
1-66 Min. Current at Low Speed
should be reduced (<100%)
Low inertia applications Keep calculated values
50>I /I >5
Load Motor
High inertia applications 1-14 Damping Gain, 1-15 Low Speed
I /I > 50 Filter Time Const. and 1-16 High
Load Motor
Speed Filter Time Const. should be
increased
High load at low speed 1-17 Voltage filter time const. should
<30% (rated speed) be increased
1-66 Min. Current at Low Speed
should be increased (>100% for
longer time can overheat the motor)
Table 3.2 Recommendations in Different Applications
If the motor starts oscillating at a certain speed, increase
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 1-66 Min. Current at Low
Speed. 100% provides nominal torque as starting torque.

3.7 Check Motor Rotation

Before running the frequency converter, check the motor
rotation. The motor will run briefly at 5 Hz or the
minimum frequency set in 4-12 Motor Speed Low Limit [Hz].
1. Press [Quick Menu].
2. Scroll to Q2 Quick Setup.
3. Press [OK].
4. Scroll to 1-28 Motor Rotation Check.
5. Press [OK].
6. Scroll to [1] Enable.
The following text will appear: Note! Motor may run in
wrong direction.
7. Press [OK].
8. Follow the on-screen instructions.
To change the direction of rotation, remove power to the
frequency converter and wait for power to discharge.
Reverse the connection of any two of the three motor
cables on the motor or frequency converter side of the
connection.