Toshiba S2E21 - Fundamental Information Settings

TOSHIBA
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7.6 Settings llased on Fundamental Information
When setting the protective characteristics of the SZE21 according to fundamental
information alone that you can obtain from the rating nameplate of the motor, the
following steps should be taken.
In this case. however, use overly conservative characteristics to ensure the
motor safety. Note that the temperature rises (6 S, 8 R) are different from
the actual motor temperature rises.
To perform accurate temperature rise simulation and protection, it is necessary
to set the motor constants.
Fundanenta.1 information:
IMFLC: motor rated current (A)
CT:
CT cecondary current (A)
0SM: allowable motor temperature rise
TSC : allowable motor locking time during cold condition
Tst: starting time (set)
1st: starting current (A)
20-Z: CT ratio (given)
20-3: ZCT ratio 50 A
This does not affect the protection characteristics.
20-4: rated cZ%it setting (I N ).
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This is calculated by the following equation:
lN = kc (A)/CT (A)
21-2: Setting of the heating time constant (TR)
TR (min) ) 3 x Tst
Hhen Tst is less than 3, setting should be
TR = 10 (min)
21-4: Setting of the cooling time constant (TD)
It should be set to 0 (TD = 3 x TR)
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