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SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
Code
ID
Parameter
Notes
P1.3.1
505
Start function “start function”
Ramp:
0. The frequency converter starts from 0 Hz and accelerates to the set reference
frequency within the set acceleration time.
Flying start:
1. The frequency converter is able to start with motor running by applying current
to motor and searching for the frequency corresponding to the speed the motor
is running at. Searching starts from the maximum frequency towards the zero
frequency until the correct value is detected.
Use this mode if the motor is coasting when the start command is given. With the
flying start it is possible to start motor form actual speed without forcing the speed
to zero before ramping to reference.
Closed loop control will always start like flying start because exact speed of the
motor is known from encoder feedback.
P1.3.2
506
Stop function “stop function”
Coasting:
0. Drive stops controlling the motor immediately and let’s motor rotate freely.
Ramp:
1. After the Stop command, the speed of the motor is decelerated according to the
set deceleration parameters to zero speed. DI “Run Enable” will make coasting stop
regardless of selected stop function.
P1.3.3
103
Acceleration time 1 “accel time 1”
This parameter defines the time required for the output frequency to increase from the
zero frequency to maximum frequency.
P1.3.4
104
Deceleration time 1 “decel time 1”
This parameter defines the time required for the output frequency to decrease from the
maximum frequency to zero frequency.
P1.3.5
500
Acceleration/Deceleration ramp 1 shape “ramp 1 shape”
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 1…100 % for this
parameter produces an S-shaped acceleration/deceleration.
Used to reduce mechanical erosion and current spikes when reference is changed.
0
10
20
30
40
50
60
0 % S
10 % S
00.51.18 .77 .32.95 .54 .13 .72 .35 .96.49 .08.67.26.85.44
Figure 5-2 . 10 % S ramp with 3 s ramp time compared to
without S ramp