Braking With Field Reversal - Siemens SIMOREG DC Master 6RA7028-6DS22 Operating Instructions Manual

Function descriptions

9.18.2 Braking with field reversal

This function is controlled by the binector selected in P581.
"Braking with field reversal" has a pushbutton function.
If the logic level of the binector controlling the "Braking with field reversal" function = 1 (for at least
30 ms) and the converter is in an operating state ≤ o5 (line contactor closed), an internal process is
activated for braking the drive down to n < n
The motor cannot accelerate again in the original rotational direction until the braking command has
been cancelled (binector level = 0) and an acknowledgement given with "Shutdown" and "Switch-on".
Sequence of control operations when "Braking with field reversal" is applied:
1. Drive rotates in direction 1
2. The binector controlling the "Braking with field reversal" function = 1 for more than 30 ms
3. Internal field reversal process takes place (only if the line contactor is closed (in operating state
of ≤ o5) and the drive is not already in braking mode. Braking is detected by a negative internal
actual speed (resulting from reversal of the real actual speed polarity in the negative field
direction):
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10 Enable field firing pulses
3.11 Wait for I
3.12 Waiting time according to P092.i004 (0,0 to 10,0 s, factory setting 3,0 s)
3.13 Enable armature firing pulses (It is possible to exit operating mode o1.4)
4. Internal sequence for braking the drive:
4.1
4.2
4.3
4.4
5. Internal sequence for switching over to original field direction (only if the current field direction is
not the same as the direction requested by the "Direction of rotation reversal using field reversal"
function):
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10 Enable field firing pulses
5.11 Wait for I
5.12 Waiting time according to P092.i004 (0,0 to 10,0 s, factory setting 3,0 s)
5.13 Armature firing pulses are possible again
9-70
Wait for armature current I
(drive then dwells in operating state ≥ o1.4)
Disable field firing pulses (also causes K0268=0)
Wait for I (K0265) < I
field
Waiting time according to P092.i001 (0,0 to 10,0 s, factory setting 3,0 s)
Open current field contactor (B0260 = 0 or B0261 = 0)
Waiting time according to P092.i002 (0,0 to 10,0 s, factory setting 0,2 s)
Close new field contactor (B0261 = 1 or B0260 = 1)
Reverse polarity of actual speed value (except when P083 = 3 ... EMF as actual speed
value)
Waiting time according to P092.i003 (0,0 to 10,0 s, factory setting 0,1
(K0265) > I
field
Internal setting of n = 0 at the ramp function generator input, the drive brakes
set
Wait for n < n (P370)
min
Wait for armature current I
(drive then switches to operating state o7.2)
Wait for cancellation of braking command through binector level = 0 (as long as
level = 1, drive is held in operating state o7.2)
Wait for armature current I
(drive then dwells in operating state ≥ o1.4)
Disable field firing pulses (also causes K0268=0)
Wait for I (K0265) < I
field
Waiting time according to P092.i001 (0,0 to 10,0 s, factory setting 3,0 s)
Open current field contactor (B0260 = 0 or B0261 = 0)
Waiting time according to P092.i002 (0,0 to 10,0 s, factory setting 0,2 s)
Close new field contactor (B0261 = 1 or B0260 = 1)
Reverse polarity of actual speed value (except when P083 = 3 ... EMF as actual speed
value)
Waiting time according to P092.i003 (0,0 to 10,0 s, factory setting 0,1 s)
(K0265) > I
field
The original field direction is then selected.
min
= 0 and then armature pulse disable
A
(P394)
field min
(K0268)*P398/100%
field set
= 0 and thus armature pulse disable
A
= 0 and then armature pulse disable
A
(P394)
field min
(K0268)*P398/100%
field set
s)
SIEMENS AG
SIMOREG DC Master Operating Instructions
02.00
6RX1700-0AD76