Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 99)

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
plus PM settings.
Recommendations in different applications can be seen in the following table:
Table 25: Recommendations in different applications
Application Settings
Low inertia applications
I
Load
/I
Motor
<5
• 1–17 Voltage filter time const. to be increased by
factor 5 to 10
• 1–14 Damping Gain should be reduced
• 1–66 Min. Current at Low Speed should be reduced
(<100%)
Low inertia applications
5–>I
Load
/I
Motor
> 5
Keep calculated values
High inertia applications
I
Load
/I
Motor
> 50
1–14 Damping Gain, 1–15 Low Speed Filter time Const.
and 1–16 High Speed Filter Time Const. should be
increased
High load at low speed
<30% (rated speed) 1–17 Voltage filter time const. should be increased
1–66 Min. Current at Low Speed should be increased
(>100% for longer time can overheat the motor)
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.
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.
Local-control test
CAUTION:
MOTOR START. Ensure that the motor, system and any attached equipment are ready for
start. It is the responsibility of the user to ensure safe operation under any condition.
Operation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 97