Motor Overload Protection - YASKAWA varispeed G7 CIMR-G7B series Instruction Manual

Motor Overload Protection

You can protect the motor from overload using the Inverter's built-in electronic thermal overload relay.
Related Constants
Name
Con-
stant
Display
Number
Motor rated Sets the motor rated current in 1 A
current units.
These set values will become the
reference values for motor protec-
E2-01
tion, torque limits and torque con-
电机额定电流
trol.
This constant is automatically set
during autotuning.
Motor 2 rated Sets the motor rated current in 1 A
current units.
These set values will become the
reference values for motor protec-
E4-01
tion, torque limits and torque con-
电机额定电流
trol.
This constant is automatically set
during autotuning.
Motor protec- Sets whether the motor overload
tion selection function is enabled or disabled at
electric thermal overload relay.
0: Disabled
1: General-purpose motor
2: Inverter motor protection
3: Vector motor protection
L1-01 In some applications when the
电机保护功能选 Inverter power supply is turned
择
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.
Motor protec- Sets the electric thermal detection
tion time con- time in seconds units.
stant Usually setting is not necessary.
The factory setting is 150% over-
L1-02 load for one minute.
When the motor's overload resis-
电机保护时间
tance is known, also set the over-
load resistance protection time for
when the motor is hot started.
* 1. The factory setting depends on the Inverter capacity. The value for a 200 V Class Inverter of 0.4 kW is given.
* 2. The setting range is from 10% to 200% of the Inverter rated output current. The value for a 200 V Class Inverter for 0.4 kW is given.
For the motor no-load current, set E2-03 to a value less than that of E2-01.
* 3. The setting range is from 10% to 200% of the Inverter rated output current. The value for a 200 V Class Inverter for 0.4 kW is given.
Setting
Description
Range
0.32 to
6.40
*2
0.32
6.40
*3
protection
0 to 3
0.1 to
5.0
Control Methods
Change
Factory during
V/f
Setting Opera-
V/f with
tion
PG
1.90 A
No Q Q
*1
to 1.90 A
No A A
*1
1 No Q Q
1.0
No A A
min
Machine Protection
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
Q Q Q 30EH
A A A 321H
Q Q Q 480H
A A A 481H
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