Elmomc SimplIQ Analog Servo Amplifiers-Violin Installatio Uživatelský manuál stáhnout pdf (Strana 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:

in (KΩ)

= (5.33 * V

) - 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.

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