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D-189

Programming

890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D

ZERO SPEED

SETUP::MOTOR CONTROL::ZERO SPEED

This function block detects when the motor speed is at or close to zero. HYSTERESIS and THRESHOLD are user-definable.

Parameter Descriptions

HYSTERISIS

PREF: 85.01

Default: 0.10 %

Range: 0.00 to 300.00 %

Provides a hysteresis band about which the outputs are stable.

IF the hysteresis value is >= to the Threshold

THEN the level is set to 2 x the hysteresis value and the Off level is set to zero,

ELSE the On level = Threshold + Hysteresis and the Off level = Threshold - Hysteresis.

THRESHOLD

PREF: 85.02

Default: 0.50 %

Range: 0.00 to 300.00 %

The nominal level below which the outputs are set.

AT ZERO SPD FBK

PREF: 85.03

Default: TRUE

Range: FALSE / TRUE

Speed feedback. TRUE when at zero speed feedback, as defined by THRESHOLD and HYSTERESIS.

IF (abs(speed feedback)) > On Level at zero speed = FALSE

ELSE if (abs(speed feedback)) <= Off Level at zero speed = TRUE

ELSE at zero speed is unchanged

AT ZERO SPD DMD

PREF: 85.04

Default: TRUE

Range: FALSE / TRUE

Speed demand. TRUE when at zero speed demand, as defined by THRESHOLD and HYSTERESIS.

AT STANDSTILL

PREF: 85.05

Default: TRUE

Range: FALSE / TRUE

TRUE when both AT ZERO SPD FBK and AT ZERO SPD DMD are TRUE.

Parker ac890 User Manual

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