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During system integration, ensure that there is sufficient clearance around and under the board to

keep the circuits firom being shorted out, and that all of the connectors, adjustment

potentiometers, and test points are accessible.

3.3.

Input Power

Refer

the 670 Schematic located in section 6.0. for details on this section.

Input DC power is fed onto the board via the

4-pin

male Molex connector, J3. The mating

female cormector, Molex # 15-24-4048 with Molex pins # 02-08-1202 have been included with

the system and contained in the connector kit.

The supply voltages are connected directly to the output amplifier. The voltage need not be

highly regulated, but for hi^ accuracy applications, it is recommended the voltages be as free

from noise as practical. Filter capacitors on the 670 board help to supply the board's transient

current demands

from

the power supplies allowing for smaller supplies in general.

The 670 board is normally used with +/- 28V supplies. The input voltage is regulated down to +/-

15V for the analog circuitry and +5V for the digital circuitry. The table below shows the voltage

ranges along with fault trip point levels and proper jumper and resistor settings. Consult the table

below for configuring the system with alternate supply voltages:

Supplv Voltage Range Trip Point VoltaRe Jumper Connect R94 & R96 Values

+/-18V

to +/-28v(max) <+/-17v - 13.3k

+/-15V

to +/-18v(max) <+/-12v W2&W3

7.87k

For operation within the

+/-15v

to +/-18v, the supply voltage will not be regulated on board, and

will connect directiy to the analog circuitry. In this situation, damage to the board will result if

the voltage exceeds +/-18v! For these situations, it is highly recommended that low noise,

regulated power supplies with over-voltage "crowbar" type protection be used. Refer to the next

paragraph for instruction.

In general the higher the voltage, up to +/-28V, the shorter the large angle step response time or ^

the better the performance. The systems are factory tested at +/-28V. The input current

requirements vary depending on a number of parameters e.g. which type of scanner is being

used, how the system is tuned, what type of waveform is being input. Power supply design

should consider the current required to run all ofthe analog circuitry, +/-150nLA, and the current

required to run the scanner at the maximiun

RMS

current demands.

The 670 board has power fault monitoring to ensure proper "tum-ofF' sequencing whether

intentional or accidental. Should the input supply voltage dip below a "Trip Point Voltage"

minimum set by the fault detector, the servo will tum off and stay off until the input voltage has

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