Lenze EVS9332xK - Manual (Page 346)

Function library
Function blocks
3.2.100 Virtual master (VMAS)
3−318
l
EDSVS9332K−EXT EN 4.0
3.2.100.1 Generation of a virtual master value
If, for instance, no master system is available, a virtual master value (potentiometer setpoint) can be
applied to the input VMAS1−AIN. This can be the case when the drive is not operated in a system and
thus no synchronous operation is required.
The input signal is switched to the output VMAS1−DFOUT if
l VMAS1−EN−AIN = HIGH and
l code C1460 = 0
The analog setpoint selection at VMAS1−AIN = 100% corresponds to the maximum motor speed,
which is input in C0011 during commissioning (see Operating Instructions 9300 cam profiler).
3.2.100.2 Digital frequency input
As an alternative to the analog input VMAS1−AIN (input in [%]), a signal, which must be input as an
absolute value [rpm], can be assigned to the digital frequency input VMAS1−DFIN.
The input signal is switched to the output VMAS1−DFOUT if
l VMAS1−EN−AIN = HIGH and
l code C1460 = 1
STOP!
When using the digital frequency input (−DFIN), pulse losses occur when the ramp function generator
(VMAS1−EN−RFG = HIGH) is/will be activated. The drive loses the contact with its master. If a ramp
function generator is required in connection with the digital frequency input, the FB DFRFG1 can be
connected upstream of the input. For this purpose, VMAS1−EN−RFG must be set to LOW.
3.2.100.3 Changeover to alternative master value
This function, for instance, is required when a rough−running drive in the drive system creates an
impermissibly high following error. Due to the arising asynchronous operation between master drive
and cam the plant may be damaged.
The master speed (input −AIN) can be decreased by changing over to an alternative master value.
Then, the drive setpoint is created by the input VMAS1−RED−VAL, e.g. via code, analog input, motor
potentiometer, etc..... This master value input has priority over all other setpoint sources.
Before changeover, the input −RED−VAL must be activated:
l VMAS1−EN−RED = HIGH
Tip!
When VMAS1−EN−RFG = HIGH, the ramp function generator is activated. With this, the changeover
to the alternative setpoint is made via adjustable ramps (C1462/1 and −/2).