WOODWARD 9905-798 Serial Link Module

The ACC-8E has 4 18-bit D/A converters (DACs) to command the amplifiers with optical isolation from PMAC circuitry. The analog outputs have a range of -10V to +10V, and a maximum current output of 10 mA. These outputs are clamped to 0V by on-board hardware on loss of any of the on-board power-supplies (+15V, -15V, or +5V) by the amplifier-enable signal going false, or by tripping of PMAC2's watchdog timer.

Amplifier Enable Outputs 

The amplifier-enable outputs are through dry-contact relays, user configurable with jumpers for normally-open, normally closed, sinking or sourcing. The watchdog timer output is also through a dry-contact relay, with the user's choice of normally open or normally closed contacts.Because the analog outputs are active only if the amplifier-enable signal is true, when these outputs are used for non-servo purposes, including diagnostic testing, the amplifier-enable signal for the axis must be set true.

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