Zero Speed - Parker AC890 Product Manual

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
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
The nominal level below which the outputs are set.
AT ZERO SPD FBK
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
Speed demand. TRUE when at zero speed demand, as defined by THRESHOLD and HYSTERESIS.
AT STANDSTILL
TRUE when both AT ZERO SPD FBK and AT ZERO SPD DMD are TRUE.
D-186
Page
PREF: 85.01
PREF: 85.02
PREF: 85.03
PREF: 85.04
PREF: 85.05
Default: 0.10 %
Default: 0.50 %
Default: TRUE
Default: TRUE
Default: TRUE
890SD Standalone Drive - Frames G, H & J
Range: 0.00 to 300.00 %
Range: 0.00 to 300.00 %
Range: FALSE / TRUE
Range: FALSE / TRUE
Range: FALSE / TRUE