ElmoMC SimplIQ Analog Servo Amplifiers-Ocarina Evaluation Board User Guide - Manual (Page 19)

2.9 Logic Connector P2
Current command scaling resistors (R8 and R9 of the orcad design)
The user can change the default scale of the differential input (±3.75) by calculating and inserting
R8 and R9 into the designated solderless terminals.
The value of these resistors are given by:
R8=R9=5.33XVcref-20
Vcref is the desired maximum reference voltage.
If for example, the new desired scale is ±10V, all that is required is to change the default resistors
(0Ω) to 33KΩ.
External current limit-continuous (ECLC)
Refer to section 4.2.2 in the “Ocarina Installation Guide”
A solderless terminal is available for R
ECLC.
It is designated as R11 of the orcad design.
External current limit-peak (ECLP)
Refer to section 4.2.3 in the “Ocarina Installation Guide”
A solderless terminal is available for R
ECLP.
It is designated as R12 of the orcad design.
Latch mode
By setting S4 to the “ON” position, whenever one of the following failures: Short, Commutation
failure and Over Temperature occur, the amplifier will be latched in disable mode.
Disabling the amplifier (removing and reconnecting the power from the enable pins J1/1 and
J1/22) resets the latch.
Enable
Pins J1/1 and J1/22 are the inputs of an opto-coupler.
The opto-coupler must be energized to enable operation of the amplifier.
If the enable input is kept high before powering the amplifier, the amplifier power output will be
active immediately upon power on.
To enable the operation of the amplifier, the opto-coupler must be “ON”,
This can be done in two ways:
1. Apply voltage between P2/1 (EN+) and P2/9 (EN-).
Minimum “ON” voltage: 5V, current consumption 1.2mA.
Maximum “ON” voltage: 15V, current consumption 5mA.
2. Set Dip switches 1 and 2 to the “ON” position.
Apply voltage between P3/4 (+VCC) and P3/6 (SORET) (eliminate the need for
connecting voltage between P2/1 (EN+) and P2/9 (EN-).
Minimum “ON” voltage: 5V, current consumption 1.2mA.
Maximum “ON” voltage: 10V, current consumption 5mA.
Note: For disabling the amplifier set DS1 or DS2 to “OFF” .
Ocarina Evaluation Board User Guide Evaluation Board Connectors and Cables
MAN-EVLBRD-OCA (Ver. 2.2)
2-11