Crawling - Siemens 6RA7086-6KS22 Operating Instructions Manual

Function descriptions
9.6

Crawling

See also Section 8, Sheet G130
The "Crawling" function can be activated in operating state o7 and, with "Operation enabled", in the
Run state.
The "Crawl" command is entered when one or several of the binectors selected in P440 switches to
the log. "1" state. A setpoint selected in parameter P441 is assigned to each binector. If the "Crawl"
command is entered via several binectors, the setpoint values are added (limited to ±200%).
Parameter P442 can be set to define for each possible crawl command source (binector) whether or
not the ramp-function generator must be bypassed. When the ramp generator is bypassed, it operates
with ramp-up/down times of 0.
Level / edge
P445 = 0:
P445 = 1:
Sequence of operations for entering Crawl command:
If the "Crawl" command is entered in operating state o7, the line contactor is energized via the "Line
contactor closed" relay and the crawling setpoint applied via the ramp-function generator.
If the "Crawl" command is entered in the "Run" state, the drive decelerates from the operating speed
to the crawling setpoint via the ramp-function generator.
Sequence of operations for cancellation of Crawling:
With "Crawling" active, but no "Switch-on" command applied:
If all bits which activate the "Crawling" function switch to log. "0", the controllers are disabled
after n < n
min
With "Crawling" active from "Run" operating state:
If all bits which activate the "Crawling" function switch to log. "0" and if the conditions for the "Run"
operating state are still fulfilled, then the drive accelerates from the set crawling speed to the operating
speed via the ramp-function generator.
See also Section 9.3.3 (switch-on / shutdown) with regard to edge triggering, automatic restart and the
effect of the current and torque limits during braking.
9.7 Fixed setpoint
See also Section 8, Sheet G127
The "Fixed setpoint" function can be activated in the "Run" state with the "Enable controllers" signal
applied.
The "Fixed setpoint" function can be input via the binectors selected via indices .01 to .08 of
parameter P430 and via bits 4 and 5 of control word 2 (= bits 20 and 21 of complete control word)
(see function diagram in Section 8 for logic operation).
9-16
Level-triggered
Binector selected in P440 = 0: No crawl
Binector selected in P440 = 1: Crawl
Edge-triggered
The input of "Crawl" is stored when the binector state changes from 0 → 1 (see Section
8, Sheet G130). The binector selected in P444 must be in the log. "1" state at the same
time. The memory is reset when the latter binector changes state to log. "0" (see also
example circuit in Section 9.3.3, Switch-on / Shutdown).
is reached and the line contactor de-energized (operating state o7.0 or higher).
SIEMENS AG
SIMOREG DC Master Operating Instructions
05.05
6RX1700-0AD76