The d4 parameters set the Frequency Reference Hold function and Up/Down and Up/Down 2 commands.
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Sudden Movement Hazard
When you use the drive in a lifting application, you must also install external safety circuitry. The drive does not have protection against accidental load drops in lifting applications. Install electrical and/or mechanical safety circuit mechanisms that are isolated from the drive circuitry.
If you do not use external safety circuitry, the drive could drop the load and cause serious injury or death.
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| Warning |
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Sudden Movement Hazard
When you use a mechanical holding brake with the drive in a lifting application, you must close the brake if an input terminal triggers the Baseblock command to stop drive output.
If you enter the baseblock command, the motor will suddenly coast and the load will slip, which can cause serious injury or death.
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Frequency Reference Hold Function Command: This acceleration/deceleration ramp hold command uses an MFDI to momentarily stop the acceleration/deceleration of the motor, and continues to operate the motor at the output frequency at which the command reference was input. Turn OFF the acceleration/deceleration ramp hold command to continue acceleration/deceleration.
With a crane for example, use the function and a 2-stage push button to stop acceleration and operate at low speed with one of the output frequencies.
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Up/Down command: The Up/Down command is a function to activate and deactivate an MFDI to increase and decrease the frequency reference. The Up/Down command overrides frequency references from the analog input terminal, pulse train input terminal, and keypad.
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Up/Down 2 command: The Up/Down 2 command is a function that adds a set bias value to the frequency reference to accelerate or decelerate. The Up/Down 2 command activates and deactivates the MFDI to add a bias value.