Elmomc SimplIQ Analog Servo Amplifiers-Piccolo Installati Manual de usuario descargar pdf (Pagina 23)

Piccolo Installation Guide Servo Control Operation

MAN-PICIG (Ver. 2.301)

www.elmomc.com

Chapter 4:

Servo Control Operation

4.1. Current Command Input

The Piccolo 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 7: 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 5 should be used.

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