Ramp-Up Integrator - Siemens 6RA7086-6KS22 Operating Instructions Manual

Function descriptions
9.4.5

Ramp-up integrator

The ramp-up integrator is activated by setting P302 = 1, 2 or 3. After an "ON" command ("Switch-on",
"Inching", "Crawling"), ramp-function generator setting 1 (P303 to P306) is applied until the ramp-
function generator output reaches the required setpoint for the first time.
The remaining sequence of operations is controlled by the "Enable switchover of ramp-up integrator"
function (binector selected in P646).
Enable switchover of ramp-up integrator = 1:
As soon as the ramp-function generator output reaches the required setpoint for the first time
after the "ON" command, the ramp generator setting selected in P302 is activated automatically.
Enable switchover of ramp-up integrator = 0:
Ramp-function generator setting 1 (P303 to P306) remains active after the generator output has
reached its setpoint until the "Enable switchover of ramp-up integrator" function is switched to 1.
The ramp-function generator setting selected in P302 is then activated.
When the enable signal for ramp-up integrator switchover is cancelled (→ 0), ramp-function generator
setting 1 is activated again and, with a new enable command (→ 1), this setting continues to remain
active until the generator output has reached its setpoint again. The ramp generator setting selected in
P302 is then activated again.
When a "Shutdown" command is given, the drive is shut down according to setting 1.
Note:
Activation of "Ramp-function generator setting 2" (P307 to P310, selected in P637), or "Ramp-function
generator setting 3" (P311 to P314, selected in P368), has priority over the generator setting selected
by means of the "Ramp-up integrator" function.
9.4.6 Ramp-function generator tracking
The ramp-function generator output (K0190) is limited to the following values when ramp-function
generator tracking is activated:
−
M
lim it
K
When P170 = 1 (torque control), the following equation applies:
−
I
, A lim
When P170 = 0 (current control), the following equation applies:
−
I
, A lim
K
Φ
motor
n
act
+ M
limit
– M
limit
+ I
A, limit
– I
A, limit
K
p
However, if the value added to n
added.
The purpose of the "Ramp-function generator tracking" function is to ensure that the ramp generator
value cannot deviate excessively from the actual speed value once the torque or current limit has
been reached.
Note:
When ramp-function generator tracking is selected, the filter time for the speed setpoint should be set
to a low value in P228 (preferably to 0).
9-14
∗
. 1 25
+ <
n RFG
act
p
∗ Φ ∗
. 1 25
it motor
+
n
act
K
p
∗
. 1 25
it
+ <
n RFG
act
p
Normalized motor flux (1 at rated field current)
Actual speed value (K0167)
Lowest positive torque limit (K0143)
Lower negative torque limit (K0144)
Lowest positive current limit (K0131)
Lowest negative current limit (K0132)
Effective speed controller gain
were to correspond to less than 1%, then +1% or –1% would be
act
+ ∗
M . 1 25
lim it
<
output
K
p
+
< <
RFG output
+ ∗
I . 1
, A lim it
<
output
K
p
+
n
act
∗ Φ ∗
I . 1 25
, A lim it motor
+
K
p
25
+
n
act
SIEMENS AG
SIMOREG DC Master
05.05
n
act
6RX1700-0AD76
Operating Instructions