Motor Overload Protection - YASKAWA CIMR-F7A Instruction Manual

Motor Overload Protection

You can protect the motor from overload using the Inverter's built-in electronic thermal overload relay.
Related Constants
Con-
stant
Number
Motor rated
E2-01
current
Motor 2 rated
E4-01
current
Motor protec-
L1-01
tion selection
Motor protec-
L1-02 tion time con-
stant
* 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.
For the motor no-load current, set E2-03 to a value less than that of E2-01.
-60
6
Name Description
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.
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.
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.
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.
Control Methods
Change
Setting Factory during
Range Setting Opera-
V/f
tion
0.32 to
1.90 A
No Q
6.40
*1
*2
0.32
1.90 A
No A
to 6.40
*1
*2
0 to 3 1 No Q
0.1 to
1.0 min No A
5.0
MEMO
Open
BUS
V/f Flux
Loop
Regis-
with Vec-
Vec-
ter
PG tor
tor
Q Q Q 30EH
A A A 321H
Q Q Q 480H
A A A 481H