n
Electronic Thermal Motor Protection
The drive has built-in electronic thermal overload protection to detect overload conditions.
This protection meets standards set by UL and cUL for motor thermal overload protection.
The
protective
feature
is
activated
when
the
output current rises above the motor rated current
for a specified time. This speed sensitive protective feature interrupts the motor current to
protect the motor wiring and windings in the event of overload, eliminating the need for an
external overload device. When multiple motors are used with a single drive, separate overload
devices are required to properly protect the individual motor branches.
Related Parameters
No.
Parameter
Name
Description Setting Range Default Setting
E2-01
Motor Rated
Current
Sets the motor nameplate full load current in
amperes (A). This set value becomes the
reference value for motor protection, torque
limit, and torque control.
10 to 200% of drive rated
current
Determined by
o2-04 and C6-01
L1-01
Motor
Overload
Protection
Selection
Enables or disables motor thermal overload
protection (oL1)
0: Disabled
1: Protection for general purpose motor
2: Protection for inverter motor
0 to 2 1
Use L1-13 (Continuous Electrothermal
Operation Selection) to select whether
electronic thermal value is “held” or “not
held”
when the power supply is turned off.
When connecting several motors to one drive,
set “0” (disabled) and install a thermal relay on
each motor.
L1-02
Motor
Overload
Protection
Time
Sets the electronic thermal overload protection
detection time in the motor overload protection
(oL1) function.
This setting rarely needs to be changed and
should be set in accordance with the overload
tolerance of the motor.
0.1 to 5.0 1.0 min
Note: Executing C6-01 (Duty Cycle) changes motor parameters
E2 including motor rated current to the values of
the maximum applicable motor.
Setting Procedure
1.
Set E2-01 (Motor Rated Current) to the motor rated current.
Values set for the current become the base current for electronic thermal overload
protection.
2.
Set the proper motor protection level to L1-01.
The ability of the cooling fan to keep an induction motor cool varies by the speed
control range. Protection characteristics of the electronic thermal overload protection
should be set accordingly. Refer to Table 4.7 for motor types and overload tolerances.
NOTICE: When connecting multiple motors to one drive, disable the electronic overload
protection of the drive (L1-01 = 0) and protect each motor with its own motor thermal overload.
Failure to comply could result in improper drive operation.
NOTICE: Inadequate motor protection could result in damage to the motor. Configure a motor
thermal overload to disconnect main power to the drive when tripped. When using a thermal relay,
disable the motor protection function (L1-01 = “0”).
4.5 Basic Operation
106
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
2/6/2008-14:44
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