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5.3.9 Stall Prevention
H26: Stall Prevention Mode Selection (Factory Default: 0:Disable)
Range:0: Disable
1: Stall prevention during acceleration
2: Stall prevention during steady speed
3: Stall prevention during acceleration and steady speed
4: Stall prevention during deceleration
5: Stall prevention during acceleration + deceleration
6: Stall prevention during deceleration + steady speed
7: Stall prevention during acceleration + deceleration + steady speed
H27: Stall Prevention Level (Factory Default Setting : 150%)
Range:30 - 150%
NOTE: DO NOT USE STALL PREVENTION ON HOIST MOTION.
GREAT CARE SHOULD BE EXERCISED WHEN SELECTING DECELERATION
(PARAMETER VALUES 4 THROUGH 7) AS A STALL PREVENTION MODE WHEN
USING A DYNAMIC BRAKING RESISTOR.
These functions are used to prevent the traverse faults that occur due to load
fluctuation by reducing the inverter output frequency until the motor current level
decreases below H27, Stall Prevention Level. Once the motor current level satisfies
the value of H27, then the drive will increase its output frequency to its set point.
ACCELERATION
If the output current of the drive has reached the stall prevention level during drive
acceleration, the drive will stop accelerating until the current level is reduced below
H27 before it resumes acceleration to a set frequency command. See Fig. 5.3.9.
STEADY SPEED
If the output current of the drive has reached the stall prevention level during a
steady speed period, due to load fluctuation, the drive will then reduce its output
frequency until the output current level is reduced below H27. The drive will then
increase its output frequency to the set frequency command. See Fig. 5.3.10.
DECELERATION
If the DC BUS voltage reaches the Over Voltage fault level (790 VDC for the 460
VAC class, 390 VDC for the 230 VAC class) during deceleration, the drive will stop
further deceleration until DC Bus voltage drops below the fault level. See Fig.
5.3.11.
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