Parameter
Description
Data
Read/write
P238*
n-Reg Character
238
Switch arrangement for selection of characteristic within
the speed controller.
See also Compendium Chapter 7.3.7.
P238 Bit0 = 0: PI controller (standard)
The speed controller is optimized according to the familiar
rules, e.g. symmetrical optimum.
During optimization, e.g. after symmetrical optimum for a
good response to disturbances, there is an overshoot in
the control performance. This overshoot in control
performance should be reduced by a corresponding
setpoint smoothing (e.g. P221) or with the aid of the
reference model (P238 = 1).
(See also function diagram 360)
P238 Bit0 = 1: PIR controller (reference model for the I
component)
With the aid of the PIR controller characteristic (reference
model) the control performance of the speed controller
can be improved (reduction of overshoot). Precondition is
the setting according to PI controller conditions (see
above P238 = 0). In addition, for the PIR controller
(P238=1), the time constant of the reference model
(P239) shall be adjusted to such an extent that, for
example, in the case of a setpoint jump only the slightest
overshoot performance will occur.
(See also function diagram 360a)
P238 Bit1 = 0:
Speed pre-control for position speed controller with
reference model and M pre-control is deactivated.
P238 Bit1 = 1:
Speed pre-control for position speed controller with
reference model and M pre-control [function diagram
340.8] is active. (See function diagram 340 and 360a)
(Only effective with activated reference model, i.e. bit0
must be set)
P238 Bit2 = 0:
The speed limiting controller is active at 110% of the
maximum speed specified in P0452/P0453. [Function
diagram 370]
P238 Bit2 = 1:
The speed limiting controller is active at 100% of the
maximum speed specified in P0452/P0453. [Function
diagram 370]
P238 Bit3 = 0:
Speed limitation in the setpoint channel (backstop) not
active.
P238 Bit3 = 1:
Speed limitation in the setpoint channel (backstop) active.
Init: 0
Min: 0
Max: 15
Unit: -
Indices: -
Type: V2
Menus:
- Parameter menu
+ Control/gating unit
+ Speed control
- Upread/free access
Changeable in:
- Ready to switch on
P239*
Smoothing I Comp
239
Smoothing for the I component at the PIR speed
controller characteristic.
See also P238 or the Compendium Chapter 7.3.7.
If the equipment conditions permit, proceed in the
following manner: Set TN (P240) to value 0 (make a note
of the original value!) and trace K0155 at a setpoint jump;
the time constant (P239) has to be adjusted in such a
manner that the area above and below the zero line of
K0155 is approximately equal; TN (P240) then has to be
reset to the original value.
index1: 2,0
Min: 0,5
Max: 500,0
Unit: ms
Indices: 4
,FDS
Type: O2
Menus:
- Parameter menu
+ Control/gating unit
+ Speed control
- Upread/free access
Changeable in:
- Ready to switch on
- Operation enabled
40
Siemens AG 6SE7087-6QX70 (Edition AL)
SIMOVERT MASTERDRIVES Compendium Motion Control
