Chapter 12 Description of Parameter SettingsC2000
12.1-07-5
Current Limit of Speed Tracking
Default: 100
Settings 20–200%
The AC motor drive executes speed tracking only if the output current is greater than the value
set in Pr. 07-09.
The maximum current for speed tracking affects the synchronous time. The larger the parameter
setting is, the faster the synchronization occurs. However, if the parameter setting is too large, the
overload protection function may be activated.
Restart after Fault Action
Default: 0
Settings 0: Stop operation
1: Speed tracking by current speed
2: Speed tracking by minimum output frequency
In PG control mode, the AC motor drive executes the speed tracking function automatically
according to the PG speed when this setting is NOT set to 0.
Faults include: bb, oc, ov and occ. To restart after oc, ov and occ, you can NOT set Pr. 07-11 to 0.
Number of Times of Restart after Fault
Default: 0
Settings 0–10
After fault (oc, ov and occ) occurs, the AC motor drive can reset and restart automatically up to 10
times. When Pr. 07-11 is set to 0, the auto-reset / restart function is disabled after fault. The drive
re-starts according to the setting for Pr. 07-10.
If the number of faults exceeds the Pr. 07-11 setting, the drive does not reset and restart until you
press “RESET” manually and execute the operation command again.
Speed Tracking during Start-up
Default: 0
Settings 0: Disable
1: Speed tracking by maximum output frequency
2: Speed tracking by motor frequency at start
3: Speed tracking by minimum output frequency
Speed tracking is suitable for punch, fans and other large inertia loads. For example, a
mechanical punch usually has a large inertia flywheel, and the general stop method is coast to
stop. If it needs to be restarted again, the flywheel may take 2–5 minutes or longer to stop. This
parameter setting allows you to start the flywheel operating again without waiting until the
flywheel stops completely. If you can use the speed feedback function (PG + Encoder), this
speed tracking function will be faster and more accurate. Set Pr. 07-09 as the tartget of the output
current (the maximum current of speed tracking).
In PG control mode, the AC motor drive executes the speed tracking function automatically
according to the PG speed when this setting is NOT set to 0.
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