Explanation Of Parameters In Menu 3 - Emerson Commander SX Advanced User's Manual

CONTROL TECHNIQUES
5.3 - Explanation of parameters in
menu 3
Parameters marked with the symbol
accessed when an encoder feedback option is present.
3.01
: Final speed demand (
Adjustment range : ± 2 x 1.06 rpm
Represents the sum of the post ramp reference and the hard
speed reference if this has been enabled.
3.02
: Motor speed
Adjustment range : ± 2 x 1.06 rpm
Actual speed from the encoder.
3.03
: Speed error (
Adjustment range : ± 2 x 1.06 rpm
Difference between the final speed reference and the speed
feedback.
3.04
: Speed control output (
Adjustment range : ± 300.0%
The speed control output produces a torque reference to be
used in determining the value of the active current.
3.05
: Zero speed threshold
Adjustment range : 0 to 500 rpm
Factory setting : 30 rpm
If the motor speed 2.01 is at or below the level defined by this
parameter, the zero speed alarm 10.03 will be at 1,
otherwise it will be at 0.
3.06
: At speed lower limit
Adjustment range : 0 to 500 rpm
Factory setting : 30 rpm
Defines the window within which the "At speed" alarm is
activated.
10.06 is at 1 when the post-ramp reference equals the
reference ± (3.06/2).
3.07 3.09
to : Not used
3.10
: Speed loop proportional gain Kp1 (
Adjustment range : 0 to 32000
Factory setting : 200
Adjusts the stability of the motor speed in the event of sudden
variations in the reference.
Increase the proportional gain until vibration occurs in the
motor, then reduce the value by 20 to 30%, checking that the
motor remains stable in the event of sudden variations in
speed, both at no load and on load.
3.11
: Speed loop integral gain Ki1 (
Adjustment range : 0 to 32000
Factory setting : 100
Adjusts the stability of the motor speed on load impact.
Increase the integral gain so that the same speed is obtained
on load and at no load in the event of load impact.
WARNING: Do not configure a zero value in this
parameter (may cause difficulties when the motor stops).
44
ADVANCED USER GUIDE
Commander SX
IP66/Nema 4X variable speed drive
MENU 3: FREQUENCY THRESHOLDS - ENCODER OPTION
can only be
)
)
)
)
)
3.12
: Speed loop differential gain Kd1 (
Adjustment range : 0 to 32000
Factory setting : 0
Adjusts the stability of the motor speed in the event of load
shedding or sudden variations in the reference.
Reduces overshoots.
In general, leave the setting at 0.
Function not available.
3.13
: Speed loop proportional gain Kp2 (
Adjustment range : 0 to 32000
Factory setting : 200
Adjusts the stability of the motor speed in the event of sudden
variations in the reference.
The drive uses Kp1 (3.10) or Kp2 (3.13) depending on the
value of 3.16.
3.14
: Speed loop integral gain Ki2 (
Adjustment range : 0 to 32000
Factory setting : 100
Adjusts the stability of the motor speed on load impact.
The drive uses Ki1 (3.11) or Ki2 (3.14) depending on the
value of 3.16.
3.15
: Speed loop differential gain Kd2 (
Adjustment range : 0 to 32000
Factory setting : 0
Adjusts the stability of the motor speed in the event of load
shedding or sudden variations in the reference.
The drive takes account of Kd1 (3.12) or Kd2 (3.15)
depending on the value of 3.16.
Function not available.
3.16
: Speed gain select (
Adjustment range : 0 or 1
Factory setting : 0
This parameter can be modified when the drive is disabled or
enabled.
0 (Gain No1) (gai.1): Selection of gains Kp1 (3.10), Ki1
(3.11) and Kd1 (3.12).
1 (Gain No2) (gai.2): Selection of gains Kp2 (3.13), Ki2
(3.14) and Kd2 (3.15).
3.17
: Speed loop setup (
Adjustment range : 0 to 2
Factory setting : 0
0 (USER SETUP) (User): The speed loop operates with
the gains entered by the user.
1 (AUTO) (Auto): The speed loop operates with the gains
calculated from the total inertia entered in 3.18, the
bandwidth entered in 3.20 and the damping factor entered in
3.21.
2 (16 TIME) (Pr.16): For applications with very high inertia for
which a very high proportional gain is necessary, this mode
causes the proportional gain configured in 3.10 or 3.13 to be
multiplied by 16.
Function not available.
3854 en - 03.2008 / b
)
)
)
)
)
)