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SSA - Rev 6/98
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The SSA is a miniature PWM servo amplifier designed for DC servo motors. It
utilizes power MOSFETs which contribute to its high efficiency and compact
design. The SSA is constructed from two PCBs mounted on a heat sink plate. The
lower board contains the power switching transistors which drive the motor,
terminals for the power stage, the switch mode power supply and the protection
logic. The upper PCB contains the control logic, terminals for the control stage,
adjusting trimmers and indication LED's.
Standard features
* Four quadrant operation allows motor acceleration and deceleration under power
in both CW and CCW directions.
* Internal DC to DC converter allows for operation from a single supply.
* Zero deadband.
* Excellent linearity.
* 2 inputs.
* Motor current monitor.
* Inhibit/fault indication (open collector).
* Remote control functions: Inhibit and CW/CCW disable.
* Adjustable compensation.
* Continuous and peak current limits.
* Input balance (offset) adjustment.
* External current limit adjustment.
* Operation in two velocity modes (Tacho or armature voltage feedback) or current
mode.
* LED diagnostics.
* Removable terminals for easy installation and service.
The amplifiers are fully protected against the following faults:
* Under/over voltage.
* Shorts between: outputs, output to ground.
* Excess temperature.
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