Application; Signals - ABB RELION 620 Series Technical Manual

1MAC504801-IB E
4.1.10.5
4.1.10.6
620 series ANSI
Technical Manual
Timer
Once activated, the timer activates the PICKUP output. When the operation timer has
reached the set Trip delay time value, the TRIP output is activated. If the fault disappears
before the module trips, the reset timer is activated. If the reset timer reaches the value of
200 ms, the operation timer resets and the PICKUP output is deactivated.
The timer calculates the pickup duration value PICKUP_DUR, which indicates the ratio
of the pickup situation and the set trip time. The value is available in the monitored data
view.

Application

The rotation of a motor in the reverse direction is not a desirable operating condition.
When the motor drives fans and pumps, for example, and the rotation direction is reversed
due to a wrong phase sequence, the driven process can be disturbed and the flow of the
cooling air of the motor can become reversed too. With a motor designed only for a
particular rotation direction, the reversed rotation direction can lead to an inefficient
cooling of the motor due to the fan design.
In a motor, the value of the negative-sequence component of the phase currents is very
negligible when compared to the positive-sequence component of the current during a
healthy operating condition of the motor. But when the motor is started with the phase
connections in the reverse order, the magnitude of I
of I exceeds the pickup value, the function detects the reverse rotation direction and
2
provides an operating signal that disconnects the motor from the supply.

Signals

Table 192: 46R Input signals
Name Type
I SIGNAL
2
BLOCK BOOLEAN
Table 193: 46R Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
is very high. So whenever the value
2
Default Description
0 Negative sequence current
0=False Block signal for activating the blocking mode
Description
Trip
Pickup
Section 4
Protection functions
253