Toshiba S2E21 - Manual (Page 60)

TOSHIBA
Full load operation load operation
s t a r t
I
Overload operation stop
S t a r t i n g c u r r e n t - - - - -
R a t e d c u r r e n t - - - -
Time t
Temperature rise
Allowable
r i s e Relay operating point
Raced tenpreture
r i s e
Ambient temperature 0
Time t
Figure 16 Simulated Temperature Rise Timechart
In Figure 16. the allowable temperature rise is a value dependent on the
insulation design of the motor and is defined in Table 5 by and NEMA
Table 5 Insulation Class and Allowable
Temperature Rise
--
- -
Insulation class Allowable temperature
rise
Class B
Class F
Class H
NEMA