V&T Technologies Co., Ltd.
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Chapter 6 Parameter Description
100
the parameter auto-tuning. If there is over current or over voltage failure during the auto-tuning
process, it can prolong the acceleration/deceleration time P0.08 and P0.09 properly.
If the inverter power does not match the motor power, select static auto-tuning. After the tuning,
manually change the no load current P9.05 to about 40% of the motor rated current P9.04.
If the motor parameters are given, please enter the parameters to P9.05 ~ P9.09 directly. If the
motor parameters are not given, please execute the parameter auto-tuning. The magnetic
saturation and coefficient value in P9.10 ~ P.14 is automatically set during auto-tuning,
eliminating the need of setting by the user.
During the process of parameter auto-tuning, “-At-“will appear on the operation panel.
This function can be used to protect the motor.
Display of operation panel
Unit place
Protection mode
0: Motor current mode;
1: Sensor mode;
2: No action
Tens place
Low speed derating
0. Action (applicable to common motor);
1. No action (applicable to variable
frequency motor)
The unit’s place of P9.16 determines whether the motor overload protection is to be executed and
whether the motor overload protection employs current mode or sensor mode.
0: Motor current mode: Overload is calculated in accordance with motor current, running frequency and
running time and compared with the allowable motor overload time determined by P9.18. Once the
accumulated overload time is reached, the inverter will report “E.oL2” motor overload failure.
When the load type is constant torque (P9.00=0), the motor overload protection time P9.18 corresponds
to the overload protection time under 150% rated load current and is 10 minutes by factory default; when
the load type is variable torque (P9.00=1), the motor overload protection time P9.18 corresponds to the
overload protection time under 115% of rated load current and is 10 minutes by factory default.
Note: The calculation of motor overload protection continues during the inverter running and stopping
process, while the accumulated overload value will be reset when the inverter is power-off.
P9.16
Motor overload protection
00 ~ 12(00)
P9.17
Sensor protection threshold of motor
0.00 ~ 10.00 V (10.00V)
P9.18
Motor overload protection time
0.5 ~ 30.0 min (10.0min)
