ElmoMC SimplIQ Analog Servo Amplifiers-Violin Operating Manual - Manual (Page 20)

Elmo Motion Control Rev 09/09 VIO-Velocity - Operating Manual
Page 16
3.8
Limit switches
When one direction of rotation is disabled, the reference input is clamped to 0V in this direction. Please be
aware that the unit can still drift due to offset. If an absolute stop is critical to the application the controller
of the machine should also handle the switch.
3.8.1 FLS
To enable the operation of the amplifier in the forward direction the FLS opto must be “on”. This can be
done by either of two methods:
1. Applying voltage between this J4 pin 8(+) and J4 pin 10 (-).
Minimum “ON” voltage: 5V, current consumption 1.6 ma.
Maximum “ON” voltage: 15V, current consumption 5.6 ma.
When using with this mode Dipswitch 5 must be in OFF position.
2. Changing Dipswitch 5 to ON position.
3.8.2 RLS
To enable the operation of the amplifier in the reverse direction the RLS opto must be “on”. This can be
done by either of two methods:
1. Applying voltage between this J4 pin 9(+) and J4 pin 10 (-).
Minimum “ON” voltage: 5V, current consumption 1.6 ma.
Maximum “ON” voltage: 15V, current consumption 5.6 ma.
When using with this mode Dipswitch 5 must be in OFF position.
2. Changing Dipswitch 5 to ON position.
Note: Changing dipswitch 5 to the ON position bypasses both directional limit switches
3.9
Velocity Mode
In the velocity mode, op amps U1/2 are employed as a high gain error amplifier. The
amplifier sums velocity command and the velocity feedback signal, and provides the
necessary servo compensation and gain adjustments, resulting in stable, optimum servo
operation.
This op amp is configured with two feedback paths:
One, in the form of a resistive T network, controls the DC gain of this amplifier. The
equivalent value of a T network is given by:
Ω =
7
10 10
R
R
f
Resistor R7 is mounted in solderless terminals so it can be changed easily whenever the
DC gain of the error amplifier is to be changed. The AC gain is controlled by C1, R8 and
P3. Maximum AC gain is obtained with P3 set fully CCW. Setting P3 fully CW removes
AC gain and no lag in response occurs. R8 and C1 are mounted in soldering terminals and
can be easily replaced in cases when P3 range is not enough to get optimum response.