t（s）
10000
1000
100
10
1
1.12 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50
0.5
30
20
10
2
Id/In
-15-
-16-
9 Protection function
Cater for different occasions, AJR3-1000 series soft starter has set five protection grades,
they are 0 junior, 1 light load, 2 standard, 3 heavy load, 4 senior, all of them are set by PC.
The junior protection has prohibited the external instantaneous stop function, while, only re-
taining over-heat protection, short-circuit protection and input open-phase protection at sta-
rting, it is used for the occasion that doesn't need any condition to start the emergent starting.
Light load protection, standard protection and heavy load protection posses complete protec-
tion function, they are distinguished by the curve of overload heat protection time of motor.
The parameter of heat protection time of motor is shown in the table 9-2-1 and diagram 9-3-1.
The protection standard at starting for senior protection is stricter, other protection function
parameter is the same with that of standard protection.
Different protection grade and heat-protection time set by PC is shown in table 9-2-1
Table 9-2-1
FC set
Operating
overload
Protection grade
Starting current
Protection time
Releasing
time of
running
overload
Current
times
(I/Ie)
Releasing
time
(s)
0 Junior
1 Light load
2 Standard
3 Heavy load
4 Senior
No
2 grade 10 grade 20grade 10 grade
No
3s 15s 30s 15s
3 4 5 3 4 5
4.5
2.3
1.5
3 4 5
23
12
7.5
3 4 5
46
23
15
3 4 5
70
35
22
Description
As per
IEC60947-4-2
standard
Calculated according
to the starting current
over 5 times set by F7
The value in
tableis the
topical value.
■ Set the PP, otherwise according to the rated current value on the motor nameplate, when
P6, P7 input mode are the percentage mode (Set by P8), the starting current and protecting
current would have the large difference.
■The motor current set by PP can't be lower than 20% of nominal current of soft starter, when
the motor current set by PP is smaller, the error of sensitivity of protection release is incr-
eased.
9-2 Setting of protection function
9 Protection function
9-3 Protective tripping curve.
The curve for release protection of motor as per IEC60947-4-2 standard
Diagram 9-3-1
Curve for thermal protection of motor (State)
/
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