Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 741
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 OL1 Protect Time
No.
(Hex.)
Name Description
Default
(Range)
L1-02
(0481)
OL1 Protect 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.
Figure 12.119 Example: Protection Operation Time for a General-purpose Motor at Rated Output Frequency
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.
■ L1-03 Motor oH AL Reaction Select
No.
(Hex.)
Name Description
Default
(Range)
L1-03
(0482)
Motor oH AL Reaction
Select
Sets drive operation when the PTC input signal entered into the drive is at the oH3 [Motor
Overheat Alarm] detection level.
3
(0 - 3)
0 : Ramp->Stop
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal 1NO-1CM turns ON and
1NC-1CM turns OFF.
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