ElmoMC SimplIQ Analog Servo Amplifiers-Violin Operating Manual - Manual (Page 17)

VIO-Velocity - Operating Manual Rev 09/09. Elmo Motion Control
Page 13
Operation of the Servo Control
3.1
Command
The user can change the default scale of the differential input (±10.0V) by calculating and inserting R5 &
R6 into the designated solderless terminals. The value of theses resistors is given by:
Kohms V R R
MAX IN
= = =
) (
* 5 . 2 6 5
The factory default values of R5 and R6 are 25Kohms. This value is for ±10V command input.
Care must be taken not to apply input voltage above the maximum input voltage as this will cause the input
op amp to operate beyond its limits and in extreme cases may even damage the op amp. The maximium
voltage is calculated by:
8 . 0 * ) ( 5
) (
Kohms R V
MAX IN
=
3.2
CFM
The amplifier is equipped with Current Feedback Multiplier (CFM). By switching S2 to the ON position the
signal of the current feedback is multiplied by 2 and consequently the following changes occur:
• Current gains are divided by 2.
• Current monitor is multiplied by 2.
• Current limits are divided by 2.
This function should be activated whenever the rated current AND the peak current of the motor are less
than 50% of the amplifier rated continuous and peak limits respectively.
Cont.
Current limit Peak Current
limit Current
Gain (A/V) Current
monitor
(V/A)
With no CFM Ic Ip Ip/4 5/Ip
With CFM Ic/2 Ip/2 Ip/8 10/Ip
Table 7: CFM effects
The default (S2 Off) is normal current feedback.