Contents

• Enabling Integral Torque Limit Operation (L7-06 and L7-07)
In Open Loop Vector control an integral operation can be applied to the torque limit function (P-control is
standard). This improves the torque limit responsiveness and smoothes the torque limit operation. To enable
the integral operation set parameter L7-07 to 1. The integral time constant can be set in parameter L7-06.
•Setting Precautions
• When the output torque reaches the torque limit, control and compensation of the motor speed is disabled
to prevent the output torque from exceeding the torque limit. The torque limit has the priority.
• The torque limit accuracy is ±5% at an output frequency of 10 Hz or above. When output frequency is
lower than 10 Hz, the accuracy is lowered.
Motor Overload Protection
The motor can be protected from overload using the built-in electronic thermal overload relay function.
•Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Operation
V/f
Control Methods
Open
Loop
Vector
E2-01 Motor rated current 1.90 A * No Q Q Q
L1-01 Motor protection selection 1 No Q Q Q
L1-02 Motor protection time constant 1.0 min No A A A
Closed
Loop
Vector
* Factory settings depend on Inverter capacity. (The values shown are for a 200 V Class Inverter with 0.4 kW.)
Multi-Function Outputs (H2-01 to H2-03)
Set
Value
Function
V/f
Control Methods
Open
Loop
Vector
Closed
Loop
Vector
1F Motor overload (OL1, including OH3) pre-alarm (ON: 90% or more of the detection level) Yes Yes Yes
•Setting Motor Rated Current (E2-01)
Set the rated current value on the motor nameplate in parameters E2-01 (for motor 1). This set value is the
base current for the internal thermal overload calculation.
•Setting Motor Overload Protection Characteristics (L1-01)
Set the overload protection function in L1-01 according to the used motor.
The induction motor's cooling abilities vary with the motor type. Consequently, you must select the electronic
thermal protection characteristics.
Set L1-01 to:
0: to disable the thermal motor protection function.
1: to enable the thermal motor protection for a fan cooled general purpose motor (self-cooled).
2: to enable the thermal motor protection for an inverter motor (externally cooled).
3: to enable the thermal motor protection for a special vector motor (externally cooled).
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