
Protective Functions
5-
39
5
Setting Motor Protection Operation Time (L1-02)
The motor protection operation time is the time for that the motor can handle a 150% overload when it was
running with the rated load before (i.e. operating temperature was reached before applying the 150% over-
load). Set the motor protection operation time in L1-02. The factory setting is 60 sec.
Fig 5.18
shows an example of the characteristics of the electronic thermal protection operation time (L1-02 =
1.0 min., operation at 50 Hz, general-purpose motor characteristics, when L1-01 is set to 1)
Fig 5.18 Motor Protection Operation Time
Setting a Motor Overload Pre-Alarm
If the motor overload protection function is enabled (i.e., L1-01 is set to a value different from 0) and H2-01 is
set to H2-03 (output terminals M1-M2, M3-M4, and M5-M6 function selection) to 1F (motor overload OL1
pre-alarm), the motor overload pre-alarm will be output. If the electronic thermal value reaches minimum 90%
of the overload detection level, the output terminal that has been set will be turned ON.
Output Current Observation
The inverter can observe the output current and thereby detect if something is wrong in the sequence or with
the motor connection. There are two observer functions, one for the start and one during run.
Related Parameters
SE2 fault (SE2, Current observation at start)
At the brake open delay time (S1-06) + S1-14 after the Up/Down command was given, the output current is
measured. If it is below 25% of the motor no-load current (E2-03) a SE2 fault will be output.
SE3 fault (SE3, Current observation during Run)
From the time S1-15 after the Up/Down command was given, the inverter starts to observe the output current
continously. If it falls below 25% of the motor no-load current (E2-03) a SE3 will be output.
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
S1-14
SE2 detection time
200 ms
No
A
A
A
S1-15
SE3 detection time
200 ms
No
A
A
A
Operating time (min.)
Cold start
Hot start
Motor current (%)
E2-01 is set to 100%
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