Siemens SIPROTEC 7SJ62 Instruction Manual

Functions
6-977SJ62 Manual
C53000-G1140-C121-1
The setting at address  ,0272567$57 must lie above the maximum load cur-
rent and below the minimum start-up current. If no other influencing factors are
present (peak loads), the value set at address  may be a median value:
For ratios deviating from nominal conditions, the motor tripping time changes:,
At 80 % of nominal voltage (which corresponds to 80 % of nominal starting current),
the tripping time is:
After the definite time characteristic times out, the blocked rotor binary input becomes
effective and initiates a tripping signal.If the time delay associated with the definite
time characteristic is set such that a trip signal is initiated for blocked rotor conditions
within the duration of a normal motor start, faster tripping will be available during motor
starting under blocked rotor conditions.
6.8.2.1 Settings for Motor Starting Time Monitoring
In the list below, the setting range and default setting value for the current-based set-
ting are for a device with a nominal current rating I
N
= 5 A. For a nominal current rating
I
N
= 1 A, divide the Setting Options values and Default Setting value by 5. Consider
the current transformer ratios when setting the device with primary values.
135 A
200 A
---------------
0,68 I
N CT sec
⋅
=
Based on the Long-Term Current Rating:
I
STARTUP-SEC
2.5 I
N
0.68 I
N
+
2
----------------------------------------
1,6 I
NCT sec
⋅≈
=
T
TRIP
I
STARTUP
I
------------------------


2
T
STARTUP
⋅
=
T
TRIP
624 A
0.8 624 A⋅
----------------------------


2
8.5 s⋅ 13.3 s
==
Note:
Overload protection characteristic curves are effective during motor starting condi-
tions, however, thermal dissipation during motor starting is constant. The setting at
address  limits the working range of the overload protection to larger current
values.
Addr. LCD-Text Setting options Default Setting Comment
1107
I MOTOR START
3.00 ~ 50.00 A 12.50 A
Motor Start Current (Block 49,
Start 48)
4101
FCT 48/66
ON
OFF
OFF
48 / 66 Motor
(Startup Monitor/Counter)
4102
STARTUP CURRENT
5.00 ~ 80.00 A 25.00 A Maximum start-up current
4103
STARTUP TIME
1.0 ~ 180.0 sec 10.0 sec Maximum start-up time
4104
LOCK ROTOR TIME
0.5 ~ 120.0 sec 2.0 sec Fixed brake time
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English