Yaskawa Matrix Converter User Manual Page 218

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Machine Protection
6-53
Setting Motor Protection Operation Time
Set the motor protection operation time in L1-02.
If, after operating the motor continuously at the rated current, a 150% overload is experienced, set the (hot
start) electronic thermal protection operation time. The default is resistance to 150% for 60 seconds.
The following diagram shows an example of the characteristics of the electronic thermal protection operation
time (L1-02 = 1.0 min., operation at 60 Hz, general-purpose motor characteristics, when L1-01 is set to 1)
Fig 6.39 Motor Protection Operation Time
Setting Precautions
Do not connect more than one motor per MxC.
With applications where the power supply is often turned on and off, there is a risk that the circuit cannot
be protected even if this parameter has been set to 1 (enabled), because the thermal value will be reset.
To detect overload quickly, set the set value in parameter L1-02 to a low setting.
When using a general-purpose motor (standard motor), the cooling ability will be lowered by f
1/4
(fre-
quency). Consequently, the frequency may cause motor overload protection (OL1) to occur, even below
the rated current. If operating using the rated current at a low frequency, use a special motor.
Setting the Motor Overload Pre-Alarm
If the motor overload protection function is enabled (i.e., L1-01 is set to other than 0) and H2-01 to H2-05
(Terminals M1-M2, P1-PC, P2-PC, P3-C3, and P4-C4 Function Selection) are set to 1F (motor overload OL1
pre-alarm), the motor overload pre-alarm will be enabled. If the electronic thermal value reaches minimum
90% of the overload detection level, the output terminal that has been set will be turned on.
Operating time (min.)
Cold start
Hot start
Motor current (%)
E2-01 is set to 100%
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