YASKAWA CIPR-GA50C series Technical Manual page 194

5.3 UL Standards
Load Tolerance
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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.
Figure 5.19 shows an example of the electronic thermal protector operation time. Motor overload protection
operates in the range between a cold start and a hot start.
This example shows a general-purpose motor operating at the base frequency with L1-02 set to 1.0 min.
• Cold start
Shows the motor protection operation time characteristics when the overload occurs immediately after starting
operation from a complete stop.
• Hot start
Shows the motor protection operation time characteristics when overload occurs from continuous operation
below the motor rated current.
Figure 5.19 Protection Operation Time for a General-purpose Motor at Rated Output Frequency
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L1-03: Motor Thermistor oH Alarm Select
No.
Name
(Hex.)
L1-03 Motor Thermistor oH
Alarm Select
(0482)
0 : Ramp to Stop
194
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.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets drive operation when the PTC input signal entered into the drive is at the oH3 [Motor
Overheat Alarm] detection level.
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
Description
YASKAWA SIEPC71061753A GA500 Technical Manual
Overload Characteristics
(at 100% motor load)
Default
(Range)
1.0 min
(0.1 - 5.0 min)
Default
(Range)
3
(0 - 3)