Specifications

SSU - 2 Velocity Drive Setup Ver. 0002
Volts/Rev Ratio
SP20- Volts
SP21- Rev.
X7(5)
X7(4)
V (+)
V (-)
Velocity
Limit
Velocity
Command
Final
Velocity
Feedback
SP10
SV2
SV7
PI
If SV2>(SP10*1.12) then Error 200
SP10
SP10 x 1.12
SP20
10000
500
0
1000 2000
3000
4000
SP21
rpm
mV
RATIO SP20/SP21
SP10, SP20, SP21:
SSU.2 VOLTS-SPEED OF THE ANALOG VOLTAGE
On equipment having an analog interface and on spindle drives with Sercos interface, one
must indicate the relationship between the analog voltage and the velocity command.
There are three parameters to set this voltage-speed relationship.
SP20 -F00031- and SP21 -F00081- establish the voltage/speed ratio of the velocity
command.
SP21 -F00081- is allocated the maximum speed to be supplied by the motor in our
application. And SP20 -F00031- is allocated the analog voltage to be applied for that maximum
speed. The hardware limits SP20 -F00031- to 10000 millivolts (10 Volts).
SP10 -S0091- sets the maximum velocity command effective at the drive. Its value is given by
the characteristics of the motor and those of the machine.
The drive's software does not allow SP10 -S0091- values greater than 10% over the rated
(nominal) motor speed. If the instantaneous speed of the motor exceeds the SP10 value over
12%, Overspeed error 200 will be issued.
Example:
If the application requires a speed of 4000 rpm. when applying an analog voltage of 9.5 V, and
the motor has a nominal speed of 4000 rpm, the values for these parameters could be:
SP20=9500 millivolts
SP21=4000 rpm
SP10=4200 rpm
Avoid setting parameters
SP21 -F00081- and SP10 -S0091-
to similar values in order to
allow instantaneous speed
values greater than the
SP21 -F00081- values.
The modification of these
parameters has no on-line effect.
They stay in the drive's RAM
memory. To make them effective,
they have to saved into Flash
memory and the equipment must
be re-initialized.