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

Violin Installation Guide
MAN-VIOIG (Ver. 2.3)
4-1
Chapter 4: Servo Control Operation
4.1 Current Command Input
The Violin has a single differential input. The input operating voltage range is ± 3.75 V,
meaning that a 3.75 V signal will result in a fully rated peak current. The current limit
circuits will override this signal if the peak duration exceeds 2.7 seconds and/or the
required current exceeds the values set by the ECLC and ECLP signals. If the input
command voltage exceeds 3.75 V, input scaling must be implemented by adding a pair of
external resistors, according to the following formula:
R
in (KΩ)
= (5.33 * V
in
) - 20
Be careful not to apply input voltage above the maximum allowed input voltage as this
will cause the input operational amplifier to operate beyond its limits (+20 V) and in
extreme cases, may even damage it.
4.2 CFM
The amplifier is equipped with a current feedback multiplier (CFM). Connecting pin
J1/10 to J1/8 multiplies the signal of the current feedback by 2 and consequently causes
the following changes to 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.
Continuous
Current limit
Peak Current
Limit
Current
Gain(A/V) Current
Monitor
(V/A) Differential
Input
Impedance
Without CFM Ic Ip Ip/3.75 3.9/Ip 40 kΩ
With CFM Ic/2 Ip/2 Ip/7.5 7.8/Ip 40 kΩ
Table 4-1: CFM Effects
The default (pin J1/10 left open) is the low current feedback.
For permanent selection, a simple short is recommended.
For remote selection, the scheme in
Figure 4-1 should be used.