6
-60
Motor Overload Protection
You can protect the motor from overload using the Inverter's built-in electronic thermal overload relay.
Related Constants
* 1. The factory settings depend on the Inverter capacity. The values for a 200 V Class Inverter of 0.4 kW are given.
* 2. The setting range is 10% to 200% of the Inverter's rated output current. The value for a 200 V Class Inverter of 0.4 kW is given.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
E2-01
Motor rated
current
Sets the motor rated current in 1
A units.
These set values will become the
reference values for motor pro-
tection, torque limits and torque
control.
This constant is automatically
set during autotuning.
0.32 to
6.40
*2
1.90 A
*1
No
Q
Q
Q
Q
30EH
E4-01
Motor 2 rated
current
Sets the motor rated current in 1
A units.
These set values will become the
reference values for motor pro-
tection, torque limits and torque
control.
This constant is automatically
set during autotuning.
0.32
to 6.40
*2
1.90 A
*1
No
A
A
A
A
321H
L1-01
Motor protec-
tion selection
Sets whether the motor overload
function is enabled or disabled
at electric thermal overload
relay.
0: Disabled
1: General-purpose motor
protection
2: Inverter motor protection
3: Vector motor protection
In some applications when the
Inverter power supply is turned
off, the thermal value is reset,
so even if this constant is set to
1, protection may not be
effective.
When several motors are con-
nected to one Inverter, set to 0
and ensure that each motor is
installed with a protection
device.
0 to 3
1
No
Q
Q
Q
Q
480H
L1-02
Motor protec-
tion time con-
stant
Sets the electric thermal detec-
tion time in seconds units.
Usually setting is not necessary.
The factory setting is 150%
overload for one minute.
When the motor's overload
resistance is known, also set the
overload resistance protection
time for when the motor is hot
started.
0.1 to
5.0
1.0 min
No
A
A
A
A
481H