Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-07-6
07-12
Speed Tracking during Start-Up
Default: 0
Settings 0: Disabled
1: Speed tracking by the maximum output frequency
2: Speed tracking by the current frequency command at start-up
3: Speed tracking by the minimum output frequency
4: Speed tracking by vector-type flux
When using SynRM, only Pr.07-12 = 3 (speed tracking by the minimum output frequency) is
enabled.
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.
When using PM, Pr.07-12 ≠ 0, the speed tracking function is enabled. When Pr.07-12 = 1, 2 or 3,
the output frequency converts to the actual rotor speed from zero-speed.
Pr.07-12 = 4 only supports IMVF and IMSVC control modes. For a better tracking result, it is
recommended to complete the IM parameter auto-tuning (static, rolling or advanced rolling auto-
tuning) before enabling this function.
Pr.07-12 = 4 (Speed tracking by the motor vector flux) uses the current motor auto-tuning
parameter for the motor’s vector magnetic field speed tracking. Compared to the speed tracking
function of Pr.07-12 = 1–3, it tracks the motor’s rotor speed more smoothly, also avoids rapid
increasing / decreasing the rotor speed and generating high current.
Pr.07-12 = 4 takes Pr.10-28 (FOC gain for excitation current rise time, default = 100%Tr,
minimum value = 33%Tr) as the speed tracking time. You can adjust the speed tracking current
through Pr.05-05 (No-load Current).
07-13
dEb Function Selection
Default: 0
Settings 0: Disabled
1: dEb with auto-acceleration / auto-deceleration, the drive does not output
the frequency after the power is restored.
2: dEb with auto-acceleration / auto-deceleration, the drive outputs the
frequency after the power is restored
3: dEb low-voltage control, then the drive’s voltage increases to 350 V
DC
/ 700
V
DC
and ramps to stop after low frequency
4: dEb high-voltage control of 350 V
DC
/ 700 V
DC
, and the drive ramps to stop
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