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10,000
0
.1
0
.1
Overload
Curve
Examples
4
3
1
2
1
10
100
1,000
Units
--~
Multiples
of
Current
(Times)
Overload
Curve
Examples
12
Time
(sec)
s
Short-circuit,
Overcurrent,
and
Undercurrent
1000
4
Overcurrent
-
m
Short-Circuit
1111
1
1
1111111
1
1111
HI
0
.01
0
.1
1
10
100
1,000
Units
Multiples
of
Current
(Times)
Unbalance
Curve
Ground
Fault
Curve
i
5 10 15
20 25
30 35
Time
(sec)
0
.5
5 10
15
20 25
30 35
40
45
Underbalance
(%)
Zero
square
current
(~
)
(Ratio
against
ZCT
primary
rating)
Function
Description
Overload
Rated
curren
:
t
2A
-
2000A
Heat
time constant
:
10
-
165
Min
.
Cooling
time
constant
:
10
-
500
Min
.
Allowable
temperature
rise
of
stator
:
60
-
125°C
Instantaneous
Operating
current
:
5
-
17 x
Rated
current
±
15%
Over
current
Operating
time
:
50ms
or
less
Overcurrent
Operating
current
:
1
.5
-
10
x
Rated
current
±
5%-
Operating
time
:
0
.3
- 1
Sec
.
Phase
Operating
current
:
0
.5
x
Rated
current
±
10%
unbalance
(Minimum)
(3Q)
Average)
Unbalance
ratio
:
5-30%
Operating
time
:
4
sec
.
of
less
PROTECTION
Under
Operating
current
:
0
.3
-
0
.8
x
Rated
current
±
10%
current
Operating
time
:
1 -
5
sec
.
±
10%
Ground
fault
Operating
current
:
0
.05
-
.40
x
ZCT
Pri
.Rating
±
10%
Operating
time
:
0
.1
- 1
.5
sec
.
0
.1
sec
. :
+
40%
-
0%
Others
:
±
20%
Locked
rotor
Starting
current
set
:
1
.5
-
15 x
Rated
current
Starting
time
set
:
1 -
60
sec
.
Allowable
locked
rotor
time
:
1 -
130sec
.
Repeated
start
Automatically
calculated
based
on motor
operation
history,
present
conditions
and
thermal
capability
of
motor
.
External
2
external
fault
input
ports
fault
input
Curve
No
.
Heating
time
constant
(min)
Allowable
temperature
rise
(IC)
Rated
temperature
rise
(IC)
1
10
125
10
2
10
125
100
3
165
125
10
4
165
125
100
C~i%
:
:al
1,000
c
100
U
N
U
m
100
0)
I
10
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am
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10
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O
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~~/~IIIII~~~111111~~~~11111~~~111111
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Q
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1
~1
N11
1I
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a
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.1
.
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