Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 941
Figure 11.125 Protection Circuit Configuration to Connect More than One Motor to One Drive
NOTICE: When one drive is operating more than one motor at the same time or when the rated current of the motor is much
larger than rated current of a standard motor, you cannot protect the motor with electronic thermal protection. To protect each
motor, set L1-01 =0 [Motor Overload (oL1) Protection = Disabled], configure the circuits, then add thermal relays to each motor.
The magnetic contactor installed for motor protection cannot be switched ON/OFF during run. Failure to obey can cause motor
failure.
1 : Variable Torque
Use this setting for general-purpose motors with a 60 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 overload protection from low speed to high speed across the full speed range.
Load Tolerance Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to operate with
commercial line power. Operate at a 60 Hz
base frequency to maximize the motor
cooling ability.
If the motor operates at frequencies less than
60 Hz, the drive will detect oL1. The drive
triggers a fault relay output and the motor
coasts to stop.
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 cause motor overload.
Load Tolerance Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to withstand
increased temperatures during continuous
operation in the low speed range (10% base
frequency).
The motor operates continuously at 10% to
100% base frequency. Operating slower than
10% speed at 100% load will cause motor
overload.
3 : Constant Torque 100:1 SpeedRange
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