Danfoss VLT AutomationDrive FC 300 Design Manual page 130

7. Application Examples
The example given below illustrates the programming of frequency converter connections.
The external brake can be connected to relay 1 or 2, see paragraph
Brake
terminal 29 to Terminal mode 29 Output [1] and Torque limit & stop [27].
Description:
If a stop command is active via terminal 18 and the frequency converter is not at the torque limit,
the motor ramps down to 0 Hz.
If the frequency converter is at the torque limit and a stop command is activated, terminal 29
Output (programmed to Torque limit and stop [27]) is activated. The signal to terminal 27 changes
from 'logic 1' to 'logic 0', and the motor starts to coast, thereby ensuring that the hoist stops even
if the frequency converter itself cannot handle the required torque (i.e. due to excessive overload).
-
-
-
7
-
7.1.8. Automatic Motor Adaptation (AMA)
AMA is an algorithm to measure the electrical motor parameters on a motor at standstill. This
means that AMA itself does not supply any torque.
AMA is useful when commissioning systems and optimising the adjustment of the frequency con-
verter to the applied motor. This feature is particularly used where the default setting does not
apply to the connected motor.
Par. 1-29 allows a choice of complete AMA with determination of all electrical motor parameters
or reduced AMA with determination of the stator resistance Rs only.
The duration of a total AMA varies from a few minutes on small motors to more than 15 minutes
on large motors.
Limitations and preconditions:
•
•
•
•
•
130
. Program terminal 27 to Coast, inverse [2] or Coast and Reset, inverse [3], and program
Start/stop via terminal 18
Par. 5-10 Start [8]
Quickstop via terminal 27
Par. 5-12 Coasting Stop, Inverse [2]
Terminal 29 Output
Par. 5-02 Terminal 29 Mode Output
[1]
Par. 5-31 Torque Limit & Stop [27]
Relay output [0] (Relay 1)
Par. 5-40 Mechanical Brake Control
[32]
For the AMA to determine the motor parameters optimally, enter the correct motor
nameplate data in par. 1-20 to 1-26.
For the best adjustment of the frequency converter, carry out AMA on a cold motor.
Repeated AMA runs may lead to a heating of the motor, which results in an increase of
the stator resistance, Rs. Normally, this is not critical.
AMA can only be carried out if the rated motor current is minimum 35% of the rated
output current of the frequency converter. AMA can be carried out on up to one oversize
motor.
It is possible to carry out a reduced AMA test with a Sine-wave filter installed. Avoid
carrying out a complete AMA with a Sine-wave filter. If an overall setting is required,
remove the Sine-wave filter while running a total AMA. After completion of the AMA,
reinsert the Sine-wave filter.
If motors are coupled in parallel, use only reduced AMA if any.
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
FC 300 Design Guide
Control of Mechanical