D4: Frequency Ref Up/Down & Hold - YASKAWA CIPR-GA50C series Technical Manual

12.5 d: References
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d4: Frequency Ref Up/Down & Hold
The d4 parameters set the Frequency Reference Hold function and Up/Down and Up/Down 2 commands.
WARNING! 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.
WARNING! 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.
• 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.
• 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.
• 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.
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d4-01: Freq Reference Hold Selection
No.
Name
(Hex.)
d4-01 Freq Reference Hold
Selection
(0298)
Set H1-xx [MFDI Function Selection] to one of these values to enable this parameter:
• A [Accel/Decel Ramp Hold]
• 10/11 [Up/Down Command]
• 75/76 [Up/Down 2 Command]
0 : Disabled
• Acceleration/Deceleration Ramp Hold
When you enter a Stop command or de-energize the drive, the hold value is reset to 0 Hz. The drive will use the
active frequency reference when it restarts.
• Up/Down Command
When you enter a Stop command or de-energize the drive, the frequency reference value is reset to 0 Hz. The
drive will start from 0 Hz when it restarts.
• Up/Down 2 Command
When you enter the Stop command or 5 s after you release the Up/Down 2 command, the drive does not save
the frequency bias. The Up/Down 2 function will start with a bias of 0% when the drive restarts.
1 : Enabled
• Acceleration/Deceleration Ramp Hold
When you clear the Run command or de-energize the drive, it will save the last hold value. The drive will use
the saved value as the frequency reference when it restarts.
Note:
When you energize the drive, continuously enable the MFDI terminal set for Accel/Decel Ramp Hold [H1-xx = A]. If the digital input
does not activate, the drive will clear the hold value and set it to 0 Hz.
548
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the function that saves the frequency reference or the frequency bias (Up/Down 2) after a
Stop command or when de-energizing the drive.
Description
YASKAWA SIEPC71061753A GA500 Technical Manual
Default
(Range)
0
(0, 1)