9/52
L3016
1SDH000559R0002
ABB SACE
SACE PR021/K
• The LED test, consisting of all LEDs lighting up in sequence, takes place when the PR021/K unit is switched on;
the LED status is subsequently linked to normal unit operation.
• Any LED lighting state which does not conform with the above conditions, probably indicates a malfunction of the
SACE PR021/K unit.
• The indications given in the above table are with Vaux installed.
• For further details of possible malfunction conditions, see par. 6.
3.3. Terminal boxes
Connections 1...26 inputs and outputs of PR021/K unit (see pars. 5.1 and 5.2).
Signal Priority
Bus KO high priority
Missing identification
K51 Dis/En
Test Dis/En low priority
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