Signals - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.5.3.6
402
175
Negative Seq factor =
2
5 7 .
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Setting the thermal restart level
The restart disable level can be calculated as follows:

startup time of the motor
θ i = 100 % −

operate time when no prior load

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For example, the motor startup time is 11 seconds, start-up current 6 x rated and Time
constant start is set for 800 seconds. Using the trip curve with no prior load, the operation
time at 6 x rated current is 25 seconds, one motor startup uses 11/25 ≈ 45 percent of the
thermal capacity of the motor. Therefore, the restart disable level must be set to below 100
percent - 45 percent = 55 percent, for example to 50 percent (100 percent - (45 percent +
margin), where margin is 5 percent).
Setting the thermal alarm level
Tripping due to high overload is avoided by reducing the load of the motor on a prior
alarm.
The value of Alarm thermal value is set to a level which allows the use of the full thermal
capacity of the motor without causing a trip due to a long overload time. Generally, the
prior alarm level is set to a value of 80 to 90 percent of the trip level.

Signals

Table 327: 49M Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
I2 SIGNAL
BLOCK BOOLEAN
START_EMERG BOOLEAN
TEMP_AMB FLOAT32
5 4 .
=

× 10 0 0 % + margin


Default Description
0 Phase A current
0 Phase B current
0 Phase C current
0 Negative sequence current
0=False Block signal for activating the blocking mode
0=False Signal for indicating the need for emergency start
0 The ambient temperature used in the calculation
1MAC504801-IB E
(Equation 31)
620 series ANSI
Technical Manual