Danfoss VLT AutomationDrive FC 302 Design Guide

FC 300 Design Guide
Introduction to FC 300
" DigiPot Reference
The DigiPot function is a n additional reference source
for gradually increasing or decreasing the speed
reference i.e. catching up or slowing down the speed.
Connection example:
Par. 5-12 (DI 27) DigiPot clear [57]
Par. 5-14 (DI 32) DigiPot increase [55]
Par. 5-15 (DI 33) DigiPot decrease [56]
Par. 3-90 Step Size 1%
Par. 3-91 Ramp Time 1 sec
Par. 3-92 Power Restore off
" Automatic Motor Adaptation (AMA)
AMA is a test algorithm which measures the electrical m otor parameters at motor standstill.
This means that AMA itse
lf does not supply any torque.
AMA is useful w hen commissioning systems, where you want to optimize the adjustment of
the adjustable fre quency drive to the applied m otor. This feature is p articularly used wh ere
the default settin
g does not adequately cover the motor.
Par. 1-29 allows a choice of complete AMA with determination of all electrical m o tor parameters,
or reduced AMA with determination of the stator resistance Rs only.
The duration of a tot
al AMA varies from a few minutes on small motors to more than 15 minutes on large motors.
Limitations and p
reconditions:
• For the AMA to det
ermine the motor parameters optimally, enter the correct motor
nameplate d ata in par. 1 -20 to 1 -26.
• For the best adjustment of the adjustable frequency drive, carry out AMA on a cold motor.
Repeated AMA ru
ns may lead to a heating of the motor, which results in an increase of
the stator resistance, Rs. Normally, this is n ot critical.
• AMA can only be carried out if the rated motor current is minimum 35% of the rated output current of
the adjustab
lefrequencydrive. AMAcanbecarriedoutonuptooneoversizemotor.
• It is po ssible to carry out a redu ced AMA test with an LC filter installed. Avoid carrying out
a com plete AMA with an LC filter. If an overall setting is required, remove the LC filter while
running a to
tal AMA. After completion of the A MA, re insert the LC filter.
• If mo tors are coupled in parallel, use only reduced AMA if any.
• Avoid running a complete AMA when using s ynchronous motors. If synchronous
motors are a
pplied, run a reduced AMA.
31
MG.33.B3.22 - VLT is a registered Danfoss trademark

Danfoss VLT AutomationDrive FC 302 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 302
Category	DC Drives
Language	English