Machine Protection
6
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33
Motor Overload Protection
You can protect the motor from overload using the Inverter's built-in electronic thermal overload relay.
Related Parameters
* 1. Factory settings depend on Inverter capacity. (The shown values are for a 200 V Class Inverter for 0.4 kW.)
* 2. The settings range is 10% to 200% of the Inverter rated output current. (The values shown are for a 200 V Class Inverter for 0.4 kW.)
Multi-Function Outputs (H2-01 and H2-02)
Setting Motor Rated Current
Set the rated current value on the motor nameplate in parameter E2-01 (for motor 1).
Motor Overload Protection Characteristics
Set the overload protection function L1-01 according to the applicable motor.
The following table shows the motor type and tolerance load characteristics.
Param-
eter-
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control
Methods
LCD Display
E2-01
Motor rated current
Set the motor rated current.
This set value becomes the base value for motor protection
and torque limit. It is an input data for autotuning.
0.32 to
6.40
*2
1.90 A
*1
No
Q
Motor Rated FLA
L1-01
Motor protection selec-
tion
Set to enable or disable the motor overload protection
function using the electronic thermal relay.
0: Disabled
1: General motor protection
With applications where the power supply is often turned
ON and OFF, there is a risk that the circuit cannot be pro-
tected even if this parameter has been set to 1, as the ther-
mal value will be reset. If multiple motors are connected to
one Inverter, set this parameter to 0 and install a thermal
relay in each motor.
0 or 1
1
No
Q
MOL Fault Select
L1-02
Motor protection time
parameter
Set the electronic thermal detection time in minutes.
Normally, there is no need to make this setting.
The factory setting is resistance at 150% for 1 min.
If the motor overload resistance is clear, set the overload
resistance protection time during hot start to suit the motor.
0.1 to
5.0
1.0 min
No
A
MOL Time Const
Set
Value
Function
1F
Motor overload (OL1, including OH3) pre-alarm (ON: 90% or more of the detection level)
