Lenze 8400 motec - Manual (Page 240)

7 Technology applications
7.4 TA "Switch-off positioning"
240 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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7.4.1 Functional principle
The switch-off positioning is based on the TA "Actuating drive speed" with the following functional
differences:
• The motor parameter function (FB L_MPot_1 ) and the process controller (FB L_PCTRL_1 ) are not
relevant for the switch-off positioning, thus these functions are switched off in the Lenze
setting. The speed setpoint is passed through 1:1 by these FBs.
• The logic of the switch-off positioning is contained in the upstream FB L_JogCtrlExtension_1 .
• Depending on the selected control mode ( C00007 ), this FB receives its control signals via
digital inputs and/or via network.
• A corresponding linking causes the FB outputs to trigger the setpoint generator
(FB L_NSet_1 ):
[7-1] Functional principle
Truth table for activating the pre-switch off
The inputs bInputSel1 and bInputSel2 serve to select the pre-switch off according to the following
truth table:
bRFG_0
bJogSpeed2
bJogSpeed1
C701/6
C701/7
C701/12
L_JogCtrlExtension_1
bInputSel1
bInputSel2
bRfgIn
bJog1In
bRfgOut
bJog1Out
bJog2Out
bJog2In
bStop1
bSlowDown1
bStop2
bSlowDown2
bStop3
bSlowDown3
DMUX
3
0
1
2
3
0 CTRL 206
207
205
Entry in
select list:
bRfg0
bNSetInv
nNSet_a
bJog2
bJog1
nNOut_a
LA_NCtrl
L_NSet_1
C761/1
C761/2
C761/9
C761/10
C761/11
C761/3
C761/4
C761/5
C761/6
C761/7
C761/8
Edge detect.:
C488/1
C488/2
C488/3
C488/4
C488/5
C488/6
Digit
al
input
s
/
Network
signals
nMainSetValue_a
C700/1
Inputs Function Response in the setpoint generator
(FB L_NSet_1 )
bInputSel1 bInputSel2
FALSE FALSE Pre-switch off inactive No response
• The input signals bRfgIn, bJog1In
and bJog2In are passed through
1:1 to the upstream FB L_NSet_1 .
TRUE FALSE The bSlowDown1 and bStop1 inputs are
evaluated.
Pre-switch off can be activated
• See the following Truth table -
switch-off positioning .
FALSE TRUE The bSlowDown2 and bStop2 inputs are
evaluated.
TRUE TRUE The bSlowDown3 and bStop3 inputs are
evaluated.