Lenze 8400 motec - Manual (Page 504)

13 Application examples
13.2 Delayed disconnection in partial-load operation ("Sleep Mode")
504 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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13.2 Delayed disconnection in partial-load operation ("Sleep Mode")
Task:
If the drive remains below a minimum load threshold for a longer period of time, the drive is to be
switched off for saving energy. If the setpoint exceeds the minimum load threshold, the drive is to
start again.
Solution:
The GP function "Analog comparison" (
L_Compare_1 ) serves to monitor the setpoint speed. As soon
as it falls below the set switch-off threshold, the switch-off delay starts. After the set delay time has
expired, the drive switches off itself.
• The switch-off delay is implemented with the GP function "Binary delay element"
( L_DigitalDelay_1 ).
• As soon as the setpoint exceeds the switch-off threshold again, the drive restarts.
[13-3] Basic signal flow
Example parameter setting:
Digital
Delay
Compare
|IN1| < |IN2| IN2
NSet
C00472/1
30 %
IN1
LA_NCtrl: bRFG_0
C00720/1
C00720/2
On delay
Off delay
LS_DigitalOutput: bRelay
bJog1
bJog2
nNSet_a
0
0
3 2
1 2
0
1
2
C00039/1
C
/2 00039
C /2 00039 3
SetSpeedValueEff
bJogSpeed1
bJogSpeed2
nMainSetValue_a
C00680
Function
Parameter Info Setting Info
Settings for device control
C00141 Auto-start option 0x00 Starting performance of the controller:
No inhibit after mains connection.
Assignment of the input/output terminals
C00621/1 LS_DigitalOutput:bRelay 220:
L_DigitalDelay_1
_bOut
The relay is triggered by the binary delay
element.
GP function "Analog comparison"  L_Compare_1
C00680 L_Compare_1: Fct. 6: |In1| < |In2| Comparison operation:
|AIn1_Out| < | C00472/1 |
C00700/13 L_Compare_1: nIn1_a 13: SetSpeedValueEff Comparison value 1 is the input value of
the setpoint generator L_NSet_1 select-
ed via the JOG inputs.
C00700/14 L_Compare_1: nIn2_a 20: nPar1_a The comparison value 2 is selected via
the free parameter C00472/1 .
C00472/1 LS_ParFree_a: Value 1 30.0 % Selection of the comparison value 2
(switch-off threshold).
GP function "Binary delay element"  L_DigitalDelay_1
C00720/1 L_DigitalDelay_1: On delay 10 s Switch-on delay (= switch-off delay for
the drive)
C00720/2 L_DigitalDelay_1: Off delay 1 s Switch-off delay (= switch-on delay for
the drive)
C00701/23 L_DigitalDelay_1: bIn 215:
L_Compare_1_bOut
Input value of the delay element is the re-
sult of comparison.