Elmomc SimplIQ Analog Servo Amplifiers-Ocarina Installati Instrukcja Użytkownika Pobierz pdf (Strona 23)

Chapter 4: Servo Control Operation

4.1 Current Command Input

The Ocarina and Castanet have 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:

Rin (kΩ) = (5.33 * Vin) - 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 External Current Limit - Continuous (ECLC)

The continuous current limit of the Ocarina and Castanet amplifiers can be scaled down by

an external voltage or by an external resistor connected from pin J1/9 (ECLC) to pin J1/8

(ECLRET).

4.2.1 External Voltage

An external positive voltage (0 to 3.75 V) to terminal J1/9 (ECLC) in reference to terminal

J1/8 (ECLRET) will control the continuous current limit from zero to Ic (nom).

The voltage is internally clamped to 3.75 V whenever the external VECLC is greater than

3.75V.

The external voltage source must be able to source/ sink at least ±0.2 mA.

The maximum absolute VECLC allowed to be connected is 5 V.

Ocarina/Castanet Installation Guide

4-1

MAN-OCSIG (Ver. 1.4)

ECLC

IC(new) =

3.75V

* Ic(nom)

ECLC

IC(new) =

3.75V

* Ic(nom)

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