D4: Frequency Up/Down - Omron Q2A Series Technical Manual

12.4 d: REFERENCE
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d4: FREQUENCY UP/DOWN

The d4 parameters set the Frequency Reference Hold function and the Up/Down and Up/Down 2 commands.
WARNING! Crush Hazard. In hoist applications, use the applicable safety precautions to prevent the load from falling. Failure to
obey can cause death or serious injury from falling loads.
WARNING! Sudden Movement Hazard. When you use the Baseblock command with hoist applications, make sure that you
close the holding brake when you input the Baseblock command and the drive shuts off its output. Failure to do obey can cause
death or serious injury if the load moves or falls when motor suddenly coasts after you input the Baseblock command.
WARNING! Sudden Movement Hazard. When you use a mechanical holding brake with the drive in a lifting application, close
the brake when an input terminal triggers the Baseblock command to stop drive output. Failure to obey can cause death or
serious injury if a load moves because the motor suddenly coasts after you enter the Baseblock command.
• 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.
■
d4-01 FRef Hold Selection
No.
Name
(Hex.)
d4-01 FRef Hold Selection
(0298)
Set H1-xx [MFDI Function Select] to one of the these values to operate this parameter:
• 17 [Ac/Dec Hold]
• 62/63 [Up Command/Down Command]
• 65/66 [Up2 Command/Dw2 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.
• Combined with the 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 AAc/Dec Hold [H1-xx = 17] when energizing the drive. If
the digital input does not activate, the drive will clear the hold value and set it to 0 Hz.
596
V/f CL-V/f OLV CLV AOLV
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
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Default
(Range)
0
(0, 1)