13
Note
：
Imax
：
Maximum three-phase current
Is
：
Overload starting fixed value
Heat
：
Percentage heat capacity
Hs
：
Heat capacity alarm value
TS
：
Starting shield time
tE Time protection
For the increased safety type motor, after the ac winding reaches the rated operating stable
temperature at the highest ambient temperature, the time required from the beginning of passing
through the blocking current until it rises to the limit temperature is tE time.The tE time of the
increased safety motor is usually provided by the motor manufacturer, and the user can find this
data on the motor nameplate.
It provides thermal overload protection of disconnecting the power supply of the motor within tE
time during lock-in. It is only put in after the motor is started, with an independent delay timer.The
motion delay comparison of tE protection characteristic curve is shown in Table 10, and the curve
is shown in Figure 11:
2
3
4
5
9
8
7
2
3
5
8
2
5
10
20
50
t(S)
tEp(S)
15
12
100
A
I /I
