111
SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
Code
ID
Parameter
Notes
P1.8.5.4
626
Acceleration compensation “Accel.Compens.”
SPC Out
Accel.
Compensation
Freq.Out
Acceleration compensation in use
2
AccelCompensation TC
J.
J.
T
nom
P
nom
=
=
.
f
nom
2
.
f
nom
)
(2
J = System inertia (kg*m2)
f
nom
= Motor nominal frequency (Hz)
T
nom
= Motor nominal torque
P
nom
= Motor nominal power (kW).
P1.8.5.5
1311
Speed error filtering time constant “SpeedErrorFiltTC”
Filter time constant for speed reference and actual speed error. May be used to
remove small disturbances from encoder signal.
P1.8.5.6
618
Encoder filter time “Encoder1FiltTime”
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.
P1.8.5.7
1595
Encoder selection “Encoder Selector”
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.
0,1 = Encoder input 1
2 = Encoder input 2
P1.8.5.8
1577
Speed Control Torque Chain Select “SCTorqueChainSel”
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.
B5&B6, +96 = Internal motor temperature compensation
When the motor cools down or warms up the slip of the motor will change. When this
function is activated in closed loop control mode the drive will estimate changes in
motor resistance and correct the changes of motor slip automatically to achieve the
best torque estimation.
This function is automatically activated when identification run with rotating motor is
successfully finished. This option is available in closed loop control mode only.