Digital Acoustics ESBx-110 Especificaciones descargar pdf (Pagina 248)

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Control Block Description

ADDvantage-32 PLUS

4-118

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W A R N I N G

If SPDVOL = high and no redundancy is selected (both RED and

V RED = low), then if a tach failure is detected in the primary tach,

the TL bit will turn on, and the output will not switch from the

failed tach. Similarly, if RED = high, but V RED = low, and if

both tachs fail, the TL bit will turn on and the output will not

switch but will remain dependent on the failed tach. In such a

situation, a tach failure could cause equipment to "run away" and

damage machinery or injure personnel. For this reason, any time

V RED = low and SPDVOL = high, Avtron HIGHLY

RECOMMENDS configuring one of the USR FAULTS (described

in Section III) to the TL output of the TACH SELECT block.

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Any time a tach failure is detected, the TACH SELECT block will set appropriate output

bits, and switch speed feedback as the logic requires. The outputs will remain in their

states until the RES turns on. If the RES input is maintained in the high state, the TACH

SELECT block will not switch to any redundant modes, and tach failures will not be

detected.

SPECIAL NOTE:

The TACH SELECT block differs from the TACH SELECT-W block in how the GAIN

input is used to scale input feedback. The TACH SELECT block scales all inputs

(TACH1, TACH2, and CEMF) and compares the scaled inputs to the MXSPD input to

determine tach failures (i.e., tach fail is sensed if CEMF × GAIN > 0.2 × MXSPD and

TACH × GAIN< 0.05 × MXSPD). The TACH SELECT-W block compares the unscaled

inputs to MXSPD in determining tach failures (i.e., tach fail is sensed if CEMF > 0.2 ×

MXSPD and TACH < 0.05 × MXSPD). All other block operation and logic are identical.

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Digital Acoustics ESBx-110 Especificaciones Pagina 248

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