YASKAWA GA700 Technical Manual page 830

11.9 L: Protection Function
The speed control for this motor is 1 % to 100% when at 100% load. Operating slower than 1% speed at 100%
load will trigger motor overload.
Load tolerance
4 : PM Variable Torque
Use this setting for PM motors with derated torque characteristics.
The motor has less cooling capability in the low speed range because the cooling fan slows down and there is
lower overload tolerance as the speed drops. The trigger point for the electronic thermal protector changes
according to the overload tolerance characteristics of the motor. This provides motor overheat protection from low
speed to high speed across the entire 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 trigger motor overload.
Load tolerance
6 : Variable Torque (50Hz)
Use this setting for general-purpose motors with a base frequency of 50 Hz.
The motor has less cooling capability in the low speed range because the cooling fan slows down and there is
lower overload tolerance as the speed drops. The trigger point for the electronic thermal protector changes
according to the overload tolerance characteristics of the motor. This provides motor overheat protection from low
speed to high speed across the entire speed range.
830
Cooling Ability
This motor is designed to withstand
increasing temperature during continuous
operation even in the low speed range (1%
base frequency).
Cooling Ability
This motor is designed to withstand
increasing temperature during continuous
operation at both rated speed and rated
torque.
Cooling Ability
This motor is designed to withstand
increasing temperature during continuous
operation even in the low speed range (0.2%
base frequency).
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Overload Characteristics (at 100%
motor load)
The motor operates continuously at 1% to
100% base frequency. Motor overload is
triggered when operating slower than 1%
speed at 100% load.
Overload Characteristics (at 100%
motor load)
The drive detects oL1 when the motor
operates continuously at lower speed than
rated rotation speed at over 100% torque.
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. Motor overload is
triggered when operating slower than 0.2%
speed at 100% load.