56 • vacon description of parameters
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7
500 Acceleration/Deceleration ramp 1 shape
(2.4.1)
501 Acceleration/Deceleration ramp 2 shape
(2.4.2)
The start and end of acceleration and deceleration ramps can be smoothed with these
parameters. Setting value 0 gives a linear ramp shape which causes acceleration and
deceleration to act immediately to the changes in the reference signal. Setting value
0.1…10 seconds for this parameter produces an S-shaped acceleration/deceleration.
The acceleration time is determined with parameters ID103/ID104 (ID502/ID503).
Figure 18. Acceleration/Deceleration (S-shaped)
502 Acceleration time 2
(2.4.3)
503 Deceleration time 2
(2.4.4)
These values correspond to the time required for the output frequency to accelerate
from the zero frequency to the set maximum frequency (par. ID102). These parameters
give the possibility to set two different acceleration/deceleration time sets for one appli-
cation. The active set can be selected with the programmable signal DIN3 (par. ID301).
See also parameter ID1764.
504 Brake chopper
(2.4.5)
0 = No brake chopper used
1 = Brake chopper in use and tested when running. Can be tested also in READY state
2 = External brake chopper (no testing)
3 = Used and tested in READY state and when running
4 = Used when running (no testing)
When the frequency converter is decelerating the motor, the inertia of the motor and the
load are fed into an external brake resistor. This enables the frequency converter to
decelerate the load with a torque equal to that of acceleration (provided that the correct
brake resistor has been selected). See separate Brake resistor installation manual.
ID103, ID104
(ID502, ID503)
[Hz]
[t]
ID500 (ID501)
ID500 (ID501)
NX12K20
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