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YASKAWA
TOMPC71061753A YASKAWA AC Drive GA500 Installation and Operation Instruction
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
Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to withstand
increased temperatures during
continuous operation in the low speed
range (0.2% base frequency).
The motor operates continuously at
0.2% to 100% rated speed. Operating
slower than 0.2% speed at 100% load
will cause motor overload.
6 : Variable Torque (50Hz)
Use this setting for general-purpose motors with a 50 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
Cooling Capability
Overload Characteristics
(at 100% motor load)
This motor is designed to operate with
commercial line power. Operate at a 50
Hz base frequency to maximize the
motor cooling ability.
If the motor operates at frequencies less
than commercial line power, the drive
will detect
oL1
. The drive triggers a
fault relay output and the motor coasts
to stop.
L1-02: Motor Overload Protection Time
No.
(Hex.)
Name
Description
Default
(Range)
L1-02
(0481)
Motor Overload
Protection Time
Sets the operation time for the electronic thermal protector of the
drive to prevent damage to the motor. Usually it is not necessary to
change this setting.
1.0 min
(0.1 - 5.0 min)
Set the overload tolerance time to the length of time that the motor can operate at 150% load
from continuous operation at 100% load.
When the motor operates at 150% load continuously for 1 minute after continuous operation at
100% load (hot start), the default setting triggers the electronic thermal protector.
V/f
OLV
OLV/PM
OLV/PM AOLV/PM
EZOLV
