Function block library
7-231
SHB9300CRV EN 2.0
7.6.76.1 Generation of a virtual master value
If, for instance, no host is available, a virtual master value (potentiometer setpoint)can be assigned
to the input VMAS1-AIN. This can happen if the drive is not in group operation and therefore
synchronous running is not required.
The input signal is set 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 for commissioning (see Operating Instructions 9300 cam profiler).
7.6.76.2 Digital frequency input
As alternative to the analog input VMAS1-AIN (input in [%]), asignal, which must beinput asabsolute
value [rpm], can be assigned to the digital frequency input VMAS1-DFIN.
The input signal is set to the output VMAS1-DFOUT if
l
VMAS1-EN-AIN = HIGH and
l
code C1460 = 1
Stop!
With the use of the digital frequency input (-DFIN) pulse losses occur when the ramp function
generator (VMAS1-EN-RFG = HIGH) is activated. The drive loses the contact to its master. If the
connection with the digital frequency input requires a ramp function generator, the FB DFRFG1 can
be connected before the input. For this, set VMAS1-EN-RFG at LOW.
7.6.76.3 Changeover to alternative master value
This function is for instance required, if an impermissibly high contouring error occurs in a sluggish
drive operating in a group. The resulting asnychronism between master drive and cam profiler might
damage the system.
The master speed (input -AIN) can be decreased by changing to an alternative master value. The
drive setpoint is then generated through 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
Note!
WithVMAS1-EN-RFG= HIGHtheramp function generator canbeactivated.Thechangeover to the
alternative setpoint is carried out via adjustable ramps (C1462/1 and -/2).
To Next Page
Loading...
