YASKAWA GA700 Technical Manual page 942

11.9 L: Protection Functions
Use this setting for vector motors with a speed range for constant torque of 1:100.
The speed control for this motor is 1% to 100% when at 100% load. Operating slower than 1% speed at 100%
load will cause motor overload.
Load Tolerance
4 : PM Variable Torque
Use this setting for PM motors with derated torque characteristics.
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
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 base frequency of 50 Hz.
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 overload protection from low speed to high speed across the full speed range.
942
Cooling Capability
This motor is designed to withstand
increased temperatures during continuous
operation in the low speed range (1% base
frequency).
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).
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Overload Characteristics
(at 100% motor load)
The motor operates continuously at 1% to
100% base frequency. Operating slower than
1% speed at 100% load will cause motor
overload.
Overload Characteristics
(at 100% motor load)
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.
Overload Characteristics
(at 100% motor load)
The motor operates continuously at 0.2% to
100% rated speed. Operating slower than
0.2% speed at 100% load will cause motor
overload.