Toshiba S2E21 - Manual (Page 61)

TOSHIBA
The rated temperature rise represents a temperature rise for the motor's
rated current (full laod current). This value is usually submitted by a motor
manufacturer as test data.
This relay requires setting of the motor's heating time constant and the cooling
time constant. These values are also supplied as the motor data.
When they are
not shown. request them from the motor manufacturer.
As a reference. the standard values of Toshiba motors are shown in Table 6.
Table 6 Heating Time Constant of Motor
(Toshiba Standard Values)
Motor kind Time constant
(minute)
Totally Other than totally Heating Cooling
Frame
enclosed enclosed outer fan TR
I I
TD
outer fan 2 poles 4 pole
or more
355 30
400 355 45
4 450-630 400-630 60
560, 90
710 120