Chapter 4: Servo Control Operation 4.1 Ocarina/Castanet Connected to DC Motors
In order to connect the Ocarina or Castanet to a DC motor, connect Hall A (J1 pin 4 of the
drive) to Hall return (J1 pin 17 of the drive). The motor should be connected to M2, M3.
4.2 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.
4.3 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).
4.3.1 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.
VECLC
IC(new) = 3.75V * Ic(nom)
VECLC
IC(new) = 3.75V * Ic(nom)
Ocarina/Castanet Installation Guide
MAN-OCSRIG (Ver. 1.2)
4-1