YASKAWA GA800 Technical Reference page 960

12.9 L: Protection Functions
Figure 12.121 Protection Circuit Configuration to Connect More than One Motor to One Drive
NOTICE: When you connect more than one motor to one drive or when the motor amp rating is higher than the drive amp rating, set
L1-01 =0 [Motor Overload (oL1) Protection = Disabled] and install thermal overload relays for each motor. The electronic thermal
protection of the drive will not function and it can cause damage to the motor.
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 overheat protection from low speed to high speed across the full 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 cause motor overload.
Load Tolerance
960
Cooling Capability
This motor is designed to operate with commercial line
power. Operate at a 60 Hz base frequency to maximize the
motor cooling ability.
Cooling Capability
This motor is designed to withstand increased temperatures
during continuous operation in the low speed range (10%
base frequency).
Overload Characteristics
(at 100% motor load)
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.
Overload Characteristics
(at 100% motor load)
The motor operates continuously at 10% to 100% base
frequency. Operating slower than 10% speed at 100% load
will cause motor overload.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference