Elmo ISP Latch mode of the protective functions, Velocity control using tachogenerator feedback

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7.1.5Latch mode of the protective functions

Self Restart(D17 removed): The amplifier is inhibited only for the period that the inhibit cause is present.

Latch (D17 - inserted): Failures 4.7.1-5 latch the Inhibit and the diagnostic LED. For restart (after clearing the failure source), reset has to be performed by connecting the reset input to the circuit common.

7.1.6Activating the dynamic contouring of the current limits

If you do not use this feature make sure that R11 and R13 are not installed on the board.

If you want to activate this function refer to appendix B.

7.2Velocity control using tachogenerator feedback

When using tacho feedback, it is recommended to use the single ended input no.2 for the tacho signal and to use the differential input for the reference signal in order to reduce common mode noises.

R2,R3 and R4 are calculated and inserted for two tacho voltage ranges:

For Vtm > 7.5V

R3 = R4 = 1.33xVdm (Kohm)

Vdm - maximum reference voltage at the differential input.

R2 = 2xVtm - 15 (kohm)

Vtm - Voltage generated by the tacho at maximum velocity.

For Vtm < 7.5V

R3	= R4 = 10xVdm/Vtm	(Kohm)
Vdm -	maximum reference	voltage at the differential input.

Vtm - Voltage generated by the tacho at maximum velocity.

R2 = 470 Ohm

ISP - Rev 6/95