Page 239 - Sace Emax 2 Manual for design engineers

Continued from the previous page ABB | SACE Emax 2
YO-YC-YO2-YC2 : Connections
(1)
More details are available in the website http://www.abb.com/abblibrary/DownloadCenter/, which also
includes the entire circuit diagram 1SDM000091r0001.
Information on assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
particular,
for E1.2 in the kit sheets:
• 1SDH000999r0502 for YO and YO2 coils
• 1SDH000999r0503 for coils YC
and for E2.2-E4.2-E6.2 in the kit sheets:
• 1SDH001000r0502 for YO and YO2 coils
• 1SDH001000r0503 for YC and YC2 coils
(1) YC2 not available for E1.2

YU: Undervoltage coil The undervoltage coil YU controls the value of the voltage in the circuit to which it is connected.
The coil opens the circuit-breaker when its energizing voltage drops below a value between 35...70%Un
The circuit-breaker can be reclosed when the coil energizing voltage is between 85...110% Un.

The undervoltage coil YU can in addition be used for the following purposes:
• Trip unit the circuit-breaker remotely using pushbuttons of the normally closed type.
• Activate the lock when the circuit-breaker is closed (the closing of the circuit-breaker is allowed only with
the undervoltage coil energized).
IMPORTANT:
• The undervoltage coil YU is incompatible with the presence of the Fail Safe device (UL
circuit-breakers).
• The undervoltage coil YU is a emergency trip unit. For service operations use the
opening coil.
NOTE: the power supply of the coil must be drawn on the supply side of the circuit-breaker
or from an independent source.

If the undervoltage coil trips, it is necessary, after having reset it, to wait at least 100 ms
before operating the closing coil.

D1

D2
YU
YO 2

YU for E1.2

D1

D2
YU
YO 2

YU for E2.2 - E4.2 - E6.2

Continued on the next page

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