YASKAWA H6B1A002, Technical Reference

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5.4 d: References
240 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
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d4: Frequency Ref Up/Down & Hold
The d4 parameters set the Frequency Reference Hold function and Up/Down commands.
• 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.
•
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 and keypad.
■
d4-01: Freq Reference Hold Selection
No.
(Hex.)
Name Description
Default
(Range)
d4-01
(0298)
Freq Reference Hold
Selection Sets the function that saves the frequency reference after a Stop command or when de-energizing the
drive. 0
(0, 1)
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]
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.
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.
Figure 5.36 Frequency Reference Hold with Accel/Decel Hold Function
• Up/Down Command
When you clear the Run command or de-energize the drive, it will save the frequency reference value. The drive
will use the saved value as the frequency reference when it restarts.