Lenze 8400 TopLine - Manual (Page 567)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
567
9 Basic drive functions (MCK)
9.2 Internal interfaces | System block "LS_MotionControlKernel"
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9.2.3.1 "StandBy" operating mode
The internal "StandBy" operating mode is implicitly assumed if controller inhibit, pulse inhibit, quick
stop and/or DC-injection braking are activated. Thus, there is no setpoint generation by the Motion
Control Kernel in the "StandBy" operating mode.
• If the holding brake control sets a controller inhibit when the holding brake is closed, the
internal "StandBy" operating mode is not assumed.
• The "StandBy" operating mode cannot be activated via the MCK control word.
• When the "StandBy" operating mode is active, bits 0 ... 3 are set in the MCK status word.
Speed acceptance when the "StandBy" operating mode is quit
In addition to cancelling the controller inhibit, pulse inhibit, quick stop and/or DC injection braking,
a change to another operating mode from "StandBy" also requires a termination of the
magnetisation of the motor (not in case of synchronous motors). If there is a change to a setpoint-
controlled operating mode of the Motion Control Kernel the current speed is transferred to the
speed setpoint.
From version V12.00.00 onwards , a sensitivity threshold can be set for preventing a drifting of the
motor shaft in C2611/5 . If the absolute value of the current speed is below the sensitivity threshold,
the value "0" is transferred to the speed setpoint instead of the current speed. The following
illustration shows the issue:
[9-4] Example: Sensitivity threshold for speed transfer from the "StandBy" operating mode
In the Lenze setting "0.5 %", the sensitivity threshold corresponds to approx. 7.5 rpm at a reference
speed of 1500 rpm set in C00011 .

Note!
Due to a motor magnetisation of a motor normally standing still, the current speed can
also be non-zero rpm when "StandBy" is quit. If the operating mode now changes to
"Positioning", the transfer of this speed to the speed setpoint may cause a permanent
drifting of the motor shaft, depending on the activated option in C01216 .
 Current speed below sensitivity threshold  speed setpoint = 0
 Current speed above sensitivity threshold  speed setpoint = current speed
 C02611/5 : Sensitivity threshold (in [%] with regard to reference speed)
v
SetSpeed
ActSpeed
t
0
0
C02611/5
Œ
C02611/5
StandBy Positioning StandBy Positioning
ActSpeed
SetSpeed
1