Soft Stall Selection

S-Pattern Upper Limit Adjustment

Soft Stall Selection

Program Protection Settings

Soft Stall Selection

This parameter Enables/Disables the Soft Stall and Overload Trip functions. The Soft Stall function reduces the output frequency of the ASD when the current requirements of the motor exceed the Thermal Protection #1 setting; thus, reducing the output current.

If the current drops below the Thermal Protection #1 level setting within a specified time, the output of the ASD will accelerate to the programmed frequency setpoint.

If the current does not drop below the Thermal Protection #1 level setting within the specified time, a trip will be incurred if the Trip function is enabled at this parameter.

Soft Stall is highly effective in preventing motor overload trips when used on fans, blowers, pumps, and other centrifugal loads which require less torque at lower frequencies.

This parameter may be configured for a V/f motor or a standard motor.

Note: The Soft Stall setting may affect acceleration times and patterns.

Settings:

V/f Motor — (Soft) Stall Only

V/f Motor — Disable Trip/Disable Stall

V/f Motor — Enable Trip/Enable Stall

V/f Motor — Trip Only

Standard Motor — (Soft) Stall Only

Standard Motor — Disable Trip/Disable Stall

Standard Motor — Enable Trip/Enable Stall

Standard Motor — Trip Only

Parameter Type — Selection List

Factory Default — Trip Only

Changeable During Run — No

S-Pattern Lower Limit Adjustment

Program

Fundamental Parameters

Fundamental #1

S-Pattern

Parameter Type — Numerical

 

 

⇒⇒

 

 

Lower Limit Adjustment

 

 

Factory Default — 25.00

Sets the time added to the lower portion of S-pattern 1 and S-pattern 2

Changeable During Run — Yes

(decreases the accel rate at the ramp start).

 

 

 

 

 

 

 

Minimum — 0.00

 

 

 

 

 

Maximum — 50.00

 

 

 

 

 

Units — %

S-Pattern Upper Limit Adjustment

 

 

Program

 

Fundamental Parameters

Fundamental #1

S-Pattern

Parameter Type — Numerical

Upper Limit Adjustment

 

 

Factory Default — 25.00

 

 

 

 

 

Sets the time added to the upper portion of S-pattern 1 and S-pattern 2

Changeable During Run — Yes

(decreases the decel rate at the ramp end).

 

 

 

 

 

W7 ASD Installationand Operation Manual ⇒⇒

 

Minimum — 0.00

 

Maximum — 50.00

 

Units — %

 

125

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Toshiba W7 manual Soft Stall Selection, Pattern Lower Limit Adjustment, Pattern Upper Limit Adjustment