YASKAWA GA700 Series Technical Manual page 874

12.9 L: Protection Functions
Load Tolerance
5 : PM Constant Torque
Use this setting with a PM motor for constant torque that has a speed range for constant torque of 1:500.
The speed control for this motor is 0.2% to 100% when at 100% load. Operating slower than 0.2% speed at 100%
load will cause motor overload.
Load Tolerance
6 : Variable Torque (50Hz)
Use this setting for general-purpose motors with a 50 Hz base frequency.
The overload tolerance decreases as motor speed decreases because the cooling fan speed decreases and the ability
of the motor to cool decreases in the low speed range.
The overload tolerance characteristics of the motor change the trigger point for the electronic thermal protector.
This provides motor overheat protection from low speed to high speed across the full speed range.
Load Tolerance
■
L1-02: Motor Overload Protection Time
No.
Name
(Hex.)
L1-02 Motor Overload Protection
Time
(0481)
Set the overload tolerance time to the length of time that the motor can operate at 150% load from continuous
operation at 100% load.
When the motor operates at 150% load continuously for 1 minute after continuous operation at 100% load (hot
start), the default setting triggers the electronic thermal protector.
874
Cooling Capability
This motor is designed to withstand increased
temperatures during continuous operation at rated speed
and rated torque.
Cooling Capability
This motor is designed to withstand increased
temperatures during continuous operation in the low
speed range (0.2% base frequency).
Cooling Capability
This motor is designed to operate with commercial line
power. Operate at a 50 Hz base frequency to maximize
the motor cooling ability.
V/f CL-V/f OLV CLV AOLV
Sets the operation time for the electronic thermal protector of the drive to prevent damage to the
motor. Usually it is not necessary to change this setting.
If the motor operates continuously at lower speed than
rated rotation speed at more than 100% torque, the drive
will detect oL1. The drive triggers a fault relay output and
the motor coasts to stop.
The motor operates continuously at 0.2% to 100% rated
speed. Operating slower than 0.2% speed at 100% load
will cause motor overload.
If the motor operates at frequencies less than commercial
line power, the drive will detect oL1. The drive triggers a
fault relay output and the motor coasts to stop.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Overload Characteristics
(at 100% motor load)
Overload Characteristics
(at 100% motor load)
Overload Characteristics
(at 100% motor load)
Default
(Range)
1.0 min
(0.1 - 5.0 min)