YASKAWA GA500 Serie Installations- Und Bedienungansleitung Seite 276

10 Attachment
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
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
L1-02: Motor Overload Protection Time
No.
Name
(Hex.)
L1-02 Motor Overload
Protection Time
(0481)
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.
276
Cooling Capability
This motor is designed to withstand
increased temperatures during
continuous operation in the low speed
range (0.2% base frequency).
Cooling Capability
This motor is designed to operate with
commercial line power. Operate at a 50
Hz base frequency to maximize the
motor cooling ability.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
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.
YASKAWA TOMPC71061753A YASKAWA AC Drive GA500 Installation and Operation Instruction
The motor operates continuously at
0.2% to 100% rated speed. Operating
slower than 0.2% speed at 100% load
will cause motor overload.
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.
Description
Overload Characteristics
(at 100% motor load)
Overload Characteristics
(at 100% motor load)
Default
(Range)
1.0 min
(0.1 - 5.0 min)