User`s manual

apfiff09 marine vacon • 163
24-
6
SPC Out
Accel.
Compensation
Freq.Out
Acceleration compensation in use
 
nom
2
nom
nom
nom
22
P
f
J
T
f
JnsationTCAccelCompe





,
J = System inertia (kg*m
2
)
f
nom
= Motor nominal frequency (Hz)
T
nom
= Motor nominal torque
P
nom
= Motor nominal power (kW).
P2.8.4.5 Speed Error filtering time constant ID1311
Filter time constant for speed reference and actual speed error. May be used to remove
small disturbances from encoder signal.
P2.8.4.6 Encoder filter time ID618
Sets the filter time constant for speed measurement.
The parameter can be used to eliminate encoder signal noise. Too high a filter time
reduces speed control stability. Values over 10 ms are not recommended in normal
cases.
P2.8.4.7 Encoder Selection ID1595
With this parameter it is possible to select which encoder input is used for closed loop
control. Encoder board OPT-A7 is needed because of the possibility to connect two
encoders.
P2.8.4.8 Speed Control Torque Chain Select ID1557
Values are bit coded. For example, after identification run with rotating motor the value
will be 96. If you want to activate an external acceleration compensation you need to add
+2 to the existing value.
B0 +1 = Additional torque limit
The torque reference chain can be used as an additional torque limit. This option is
available in closed loop control mode only.
B1 +2 = External acceleration compensation
The torque reference is added to the speed control output, allowing the external
controller to give inertia compensation for the drive in speed control mode. This option is
available in closed loop control mode only.