D4: Frequency Reference Hold And Up/Down 2 Function - YASKAWA GA700 Technical Manual

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d4: Frequency Reference Hold and Up/Down 2 Function

d4 parameters set the Frequency Reference Hold function, the Up/Down and Up/Down 2 commands.
WARNING! Crush Hazard. Make sure that proper safety measures have been taken in hoist-type application to prevent the load
from falling. Failure to do so may result in injury.
WARNING! Sudden Movement Hazard. If using the Baseblock command with hoist-type application, make sure the holding
brake is closed when the Baseblock command is input and the drive shuts off its output. Failure to do so may result in the motor
suddenly coasting when the Baseblock command is input, which may result in the load slipping or falling.
WARNING! Sudden Movement Hazard. When using a mechanical holding brake with the drive in a lifting application, close the
brake when the drive output is cut off by a baseblock command triggered by one of the input terminals. Failure to comply will
result in a slipping load from the motor suddenly coasting when the baseblock command is entered and may cause serious
injury or death.
• Frequency Reference Hold Function Command: This acceleration/deceleration ramp hold command
momentarily stops the acceleration/deceleration of the motor with a multi-function digital input, and continues
operating the motor at the present output frequency at which the command reference was input. Acceleration/
deceleration will resume when the acceleration/deceleration ramp hold command is switched OFF.
With a crane for example, use the function in combination with 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 raise and lower the frequency reference by
switching multi-function digital input ON/OFF. 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 to accelerate or decelerate by adding a preset
bias value to the frequency reference. The Up/Down 2 command adds a bias value by switching the multi-
function digital input ON/OFF.
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d4-01: Freq Reference Retention Select
No.
Name
(Hex.)
d4-01 Freq Reference
Retention Select
(0298)
This parameter is available when H1-xx [MFDI Function Select] has been set to one of the following.
• H1-xx = A [Accel/Decel Ramp Hold]
• H1-xx = 10/11 [Up/Down Command]
• H1-xx = 75/76 [Up/Down 2 Command]
The Frequency Reference Hold function depends on which function it is combined with.
0 : Disabled
• Acceleration/deceleration Ramp Hold
The hold value will be reset to 0 Hz when the Stop command is entered or the drive is de-energized. The active
frequency reference will be the value the drive uses when it restarts.
• Up/Down Command
The frequency reference value will be reset to 0 Hz when the Stop command is entered or the drive is de-
energized. The drive will start from 0 Hz when it is restarted.
• When combined with the Up/Down 2 Command
The frequency bias is not saved when the Stop command is entered, or 5 s after the Up/Down 2 command has
been released. The Up/Down 2 function will start with a bias of 0% when the drive is restarted.
1 : Enabled
• Acceleration/deceleration Ramp Hold
The last hold value will be saved when the Run command is cleared or when the drive is de-energized. The
drive will use the saved value as the frequency reference when it restarts.
Note:
Make sure to continuously enable multi-function digital input terminal set for Accel/Decel Ramp Hold [H1-xx = A] when energizing the
drive. If the digital input does not switch ON, the hold value is cleared and reset to 0 Hz.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
Determines whether the frequency reference or the frequency bias (Up/
Down 2) value is saved when the Stop command is entered or the power
supply is shut down.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
11.5 d: Reference Settings
Default
(Range)
0
(0, 1)
11
677