YASKAWA GA700 Technical Manual page 829

Figure 11.119 Protection Circuit Configuration when Connecting Multiple Motors to Single Drive
NOTICE: The motor cannot be protected by electronic thermal protection when one drive is running two or more motors
simultaneously or the motor has a rated current significantly larger than that of standard motors (underwater motors, for
example). Add thermal relays to each motor after setting L1-01 = 0 [Motor Overload Protection Select = Disabled] and configure
circuits to protect each motor. The motor may fail if handled improperly.
1 : Variable Torque
Use this setting for general-purpose motors with a base frequency of 60 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.
Load tolerance
2 : Constant Torque 10:1 Speed Range
Use this setting for drive dedicated motors with a speed range for constant torque of 1:10.
The speed control for this motor is 10% to 100% when at 100% load. Operating slower than 10% speed at 100%
load will trigger motor overload.
Load tolerance
3 : Constant Torque 100:1 SpeedRange
Use this setting for vector motors with a speed range for constant torque of 1:100.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cooling Ability
Motor designed to operate from line power.
The motor has maximum cooling capability
when operating at a 60 Hz base frequency.
Cooling Ability
This motor is designed to withstand
increasing temperature during continuous
operation even in the low speed range (10%
base frequency).
11.9 L: Protection Function
Overload Characteristics (at 100%
motor load)
The drive detects oL1 when operating at
frequencies lower than 60 Hz. The drive
triggers a fault relay output and the motor
coasts to stop.
Overload Characteristics (at 100%
motor load)
The motor operates continuously at 10% to
100% base frequency.
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