Siemens siprotec 7SJ63 - Motor Starting Protection (48)

Technical Data
10-28 7SJ63 Manual
C53000-G1140-C120-1
10.9 Motor Starting Protection (48)
Setting Ranges/In-
crements
Motor Starting Current I
STARTUP
5.00 A to 80.00 A
1
) (Increments 0.05 A)
1
)
Pickup Threshold I
MOTOR START
3.00 A to 50.00 A
1
)(Increments 0.05 A)
1
)
Permissible Starting Time T
STARTUP
1.0 to 180.0 s (Increments 0.1 s)
Permissible Locked Rotor Time T
LOCKED-ROTOR
0.5 s to 120.0 s (Increments 0.1 s)
or ∞ (step is ineffective)
Trip Time Charac-
teristic
Dropout Ratio I
rms
/I
MOTOR START
approx. 0.95
Tolerance Pickup Threshold 2 % of set value, or 50 mA
1
)
Time Delay 5 % or 30 ms
Influencing Values
for Pickup Thresh-
old
Power supply DC voltage (V
DC
) in range
0.8 ≤ V
PS
/ V
PS nominal
≤ 1.15 1%
Temperature in range
23º F ≤ ϑ
amb
≤ 131º F 0.3% /10º F
Frequency in range
0.95 ≤ f/f
N
≤ 1.05 1%
Harmonics
- Up to 10% 3
rd
harmonic 1%
- Up to 10% 5
th
harmonic 1%
1
) for I
N
= 1 A, divide all limits by 5.
t
I
STARTUP
I
rms
------------------------


2
T
STARTUP
⋅
=
Trip Time Characteristics
I
STARTUP
Motor starting current setting.
I
rms
Actual current flowing.
I
MOTOR START
Pickup threshold setting,
used to detect motor startup.
t Trip time in seconds.
for I
rms >
I
MOTOR START
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