ABB SACE PR021/K

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L3016

1SDH000559R0002

ABB SACE

SACE PR021/K

5.8.2. Signals

The signals (K51/1...K51/8) for the SACE PR212MP protection release may be divided into 2 modes: Normal and Latch.

A description of the signals in these modes is given below.

5.8.2.1. Normal mode (see par. 4.5.1)

Dip-switch no. 11 to be set to its OFF position.

Note 1: Following a TRIP, the status of the signals is frozen signalling the trip (K51/7) and the protection that caused

it.

Note 2: If dip switch no. 10 (RESET) is set to its “MAN” position, the signals may be reset as described in par. 4.2.

Note 3: If dip switch no. 10 (RESET) is set to its “AUT” position, the signals are reset automatically when the trip on

the protection unit is reset (see par. 4.2).

Note 4: If a trip is caused by a protection function not included in the set of signals (for example, a trip for “protection

U” has occurred but the K51/4 relay was set for the “CW alarm or trip” signal), only the K51/7 relay (the protection

release TRIP alarm) will be switched.

Note 5: Backup protection signalling does not undergo freezing as per Note 1.

5.8.2.2. Latch mode (see par. 4.5.2)

Dip-switch no. 11 to be set to its ON position.

Electric

contact

Event that caused closing of the relay

Selection of dip-switches

no. 2, 3, 4

K51/1

L protection alarm or trip (overload) ---

K51/2

R protection alarm or trip (locked rotor) ---

K51/3

I protection trip (instantaneous short-circuit) ---

A = U protection alarm or trip (phase loss) dip no. 2 = A

B = CW alarm or trip (contacts worn) dip no. 2 = B

K51/5

Communication problems on the local bus (bus KO) ---

A = PTC alarm or trip (motor overtemperature) dip no. 3 = A

B = G.P. generic input status (activated if G.P. = 1) dip no. 3 = B

K51/7

Protection release TRIP alarm ---

A = L Function prealarm (overload) dip no. 4 = A

B = Backup protection alarm (Note 5) dip no. 4 = B

K51/8

K51/6

K51/4